LANGER BIOMECHANICS GROUP INC
SC TO-T, EX-99.(A)(1), 2001-01-10
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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                           Offer to Purchase for Cash
                        1,959,886 Shares of Common Stock
                                       of
                       The Langer Biomechanics Group, Inc.
                                       at
                              $1.525 Net Per Share
                                       by
                        OrthoStrategies Acquisition Corp.
                          a wholly-owned subsidiary of
                              OrthoStrategies, Inc.

--------------------------------------------------------------------------------
     THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK
     CITY TIME, ON THURSDAY, FEBRUARY 8, 2001, UNLESS THE OFFER IS EXTENDED.
--------------------------------------------------------------------------------

      The Offer is  conditioned  upon,  among other things,  there being validly
tendered and not withdrawn  1,332,722 shares of common stock, par value $.02 per
share  (the  "Shares"),  of The  Langer  Biomechanics  Group,  Inc.,  a New York
corporation  ("Langer").  The  consummation  of the Offer is also subject to the
other conditions set forth in this Offer To Purchase. See Section 13.

      The Offer is being made pursuant to a Tender Offer Agreement,  dated as of
December 28, 2000 (the "Tender Offer Agreement"),  among OrthoStrategies,  Inc.,
OrthoStrategies  Acquisition Corp. and Langer. At a meeting held on December 19,
2000, the Board of Directors of Langer unanimously  determined that the terms of
the offer are fair to, and in the best interests of, the shareholders of Langer,
and approved the Tender Offer Agreement and certain other  agreements  described
in this Offer to  Purchase.  The Board Of Directors  of Langer  recommends  that
Langer's  shareholders  accept the Offer and tender  their  Shares in the Offer.
Shareholders  are  advised,  however,  to obtain a current  market quote for the
Shares. On January 9, 2001, the closing price of the Shares was $1.75 per Share.

                                    IMPORTANT

      Any   shareholder   desiring   to  tender  all  or  any  portion  of  such
shareholder's Shares should (1) complete and sign the Letter of Transmittal or a
facsimile  thereof  in  accordance  with  the  instructions  in  the  Letter  of
Transmittal,  including any required signature  guarantees,  and mail or deliver
the  Letter  of  Transmittal   or  such   facsimile   with  such   shareholder's
certificate(s)  for the tendered Shares and any other required  documents to the
Depositary  named herein,  (2) follow the procedure for  book-entry  transfer of
Shares set forth in Section 3 or (3) request such shareholder's broker,  dealer,
commercial  bank,  trust company or other nominee to effect the  transaction for
such shareholder. Shareholders having Shares registered in the name of a broker,
dealer,  commercial  bank,  trust  company or other  nominee  must  contact such
broker,  dealer,  commercial bank, trust company or other nominee if they desire
to tender Shares so registered.

      A   shareholder   of  Langer  who  desires  to  tender  Shares  and  whose
certificates for such Shares are not immediately available, or who cannot comply
with the procedure for  Book-Entry  Transfer on a timely basis,  may tender such
Shares by following the procedures for guaranteed  delivery set forth in Section
3.

      Questions and requests for assistance  may be directed to the  Information
Agent at its  address and  telephone  number set forth on the back cover of this
Offer to Purchase. Requests for additional copies of this Offer to Purchase, the
Letter of Transmittal,  the Notice of Guaranteed Delivery and other tender offer
materials  may be  directed  to the  Information  Agent.  Shareholders  may also
contact their broker, dealer, commercial bank, trust company or other nominee.
<PAGE>

                               SUMMARY TERM SHEET

      This summary highlights important and material information from this Offer
to Purchase but does not purport to be complete.  To fully  understand the offer
described in this document and for a more complete  description  of the terms of
the offer  described in this  document,  you should read  carefully  this entire
Offer to Purchase and the Letter of Transmittal (which together,  as they may be
amended and  supplemented,  constitute  the "Offer").  We have included  section
references to direct you to a more complete  description of the topics contained
in this summary.

WHO IS OFFERING TO BUY MY SECURITIES?

      OrthoStrategies, Inc., a New York corporation ("OrthoStrategies"), through
its  wholly-owned  subsidiary,  OrthoStrategies  Acquisition  Corp.,  a New York
corporation  ("Purchaser")  is offering to buy your Shares as  described in this
document.  See  Section  9  of  this  document  for  further  information  about
OrthoStrategies.   Except  where  the  context  requires  otherwise,   the  term
"OrthoStrategies"  is used in this Offer to  Purchase to refer  collectively  to
OrthoStrategies, Inc. and OrthoStrategies Acquisition Corp.

WHAT ARE THE CLASSES AND AMOUNTS OF SECURITIES SOUGHT IN THE OFFER?

      OrthoStrategies  is offering to buy all Shares  validly  tendered  and not
withdrawn in the Offer, up to a maximum of 1,959,886 shares of the common stock,
par value $.02 per share, of Langer, which constitutes  approximately 75% of the
Shares currently outstanding.  For information about the conditions to which the
Offer is subject, see Section 13.

HOW MUCH IS ORTHOSTRATEGIES OFFERING TO PAY AND WHAT IS THE FORM OF PAYMENT?

      OrthoStrategies  is  offering to pay $1.525 in cash for each Share that it
is offering to purchase.  See Section 1 for  information  about the terms of the
Offer.

IS THERE AN AGREEMENT GOVERNING THE OFFER?

      Yes.  OrthoStrategies  and Langer  entered into a Tender  Offer  Agreement
dated  December 28, 2000.  The Tender Offer  Agreement  sets forth,  among other
matters,  the terms and  conditions of the Offer.  See Section 11 -- "The Tender
Offer Agreement".

DOES ORTHOSTRATEGIES HAVE THE FINANCIAL RESOURCES TO MAKE PAYMENT?

      Yes. OrthoStrategies has received commitments from certain individuals and
entities to advance the funds  necessary to purchase the Shares  tendered and to
pay the fees and expenses related to the Offer.  These  individuals and entities
have sufficient  liquid assets to pay for the Shares tendered in accordance with
the terms and  conditions of the Offer.  See Section 12 -- "Source and Amount of
Funds".

ARE ORTHOSTRATEGIES' FINANCIAL RESULTS RELEVANT TO MY DECISION AS TO WHETHER TO
TENDER IN THE OFFER?

      Since the Offer is for cash and is not subject to any financing condition,
OrthoStrategies'  financial  results  should not be relevant to your decision on
whether to tender your Shares in the Offer.

HOW LONG DO I HAVE TO DECIDE WHETHER TO TENDER MY SHARES?

      You may tender your Shares into the Offer until 12:00  midnight,  New York
City time, on Thursday, February 8, 2001, which is the scheduled expiration date
of the offering period,  unless  OrthoStrategies  decides to extend the offering
period.  See Section 3 of this document for  information  about  tendering  your
Shares.


                                       i
<PAGE>

CAN THE OFFER BE EXTENDED, AND UNDER WHAT CIRCUMSTANCES?

      Yes, OrthoStrategies may extend the Offer, from time to time, to a date no
later than March 31, 2001;  provided that once the  conditions to the Offer have
been  satisfied,  OrthoStrategies  cannot  extend  the  Offer for more than five
business days without the consent of Langer.

HOW WILL I BE NOTIFIED IF THE OFFER IS EXTENDED?

      OrthoStrategies  will announce by press release any extension of the Offer
no later  than  9:00  a.m.,  New York  City  time,  on the  next day  after  the
previously  scheduled  expiration  date. See Section 1 of this document for more
information about extension of the Offer.

WHAT ARE THE MOST SIGNIFICANT CONDITIONS TO THE OFFER?

      The Offer is  conditioned  upon,  among other things,  at least  1,332,722
Shares,  which constitutes  approximately 51% of the outstanding  Shares,  being
validly  tendered and not  withdrawn.  For a complete  description of all of the
conditions to which the Offer is subject, see Section 13.

      HAVE ANY SHAREHOLDERS AGREED TO TENDER THEIR SHARES?

      Yes.  All of  the  Directors  of  Langer,  Langer's  President  and  Chief
Executive Officer and a significant  shareholder of Langer, and certain entities
affiliated  with such persons,  who own in the aggregate  1,342,273  Shares have
agreed to tender their Shares in the Offer.

HOW DO I TENDER MY SHARES?

      If you hold the  certificates  for your  Shares,  you should  complete the
enclosed  Letter of  Transmittal  and enclose all the documents  required by it,
including your certificates, and send them to Register and Transfer Company (the
"Depositary") at the address listed on the back cover of this document.  If your
broker holds your Shares for you in "street  name" you must instruct your broker
to tender your Shares on your behalf.  In any case, the Depositary  must receive
all required documents prior to 12:00 midnight,  New York City time, on February
8,  2001,  which is the  expiration  date of the Offer,  unless  OrthoStrategies
decides to extend the Offer. If you cannot comply with any of these  procedures,
you still may be able to tender  your  Shares by using the  guaranteed  delivery
procedures described in this document. See Section 3 for more information on the
procedures for tendering your Shares.

UNTIL WHAT TIME CAN I WITHDRAW PREVIOUSLY TENDERED SHARES?

      The  tender  of your  Shares  may be  withdrawn  at any time  prior to the
expiration date of the offering period. In addition,  if OrthoStrategies has not
agreed to accept  your  Shares for payment by Sunday,  March 11,  2001,  you can
withdraw them at any time after that date until  OrthoStrategies  accepts Shares
for payment. See Section 4 of this document for more information.

HOW DO I WITHDRAW PREVIOUSLY TENDERED SHARES?

      You (or your  broker or bank if your  Shares  were held in "street  name")
must notify the  Depositary  at the address and  telephone  number listed on the
back cover of this document,  and your notice must include,  among other things,
the name of the shareholder that tendered the Shares, the number of Shares to be
withdrawn and the name in which the tendered Shares are registered. For complete
information  about the  procedures  for  withdrawing  your  previously  tendered
Shares, see Section 4.

WHAT HAPPENS IF MORE THAN 1,959,886 SHARES ARE TENDERED?

      OrthoStrategies  is offering to purchase up to 1,959,886  Shares.  If more
than 1,959,886 Shares are properly  tendered and not withdrawn at the expiration
of the Offer,  OrthoStrategies  will purchase  Shares on a pro rata basis.  This
means that  OrthoStrategies  will  purchase  from each  tendering  shareholder a
number  of  Shares  equal to the  number of  Shares  properly  tendered  and not
withdrawn by such shareholder  multiplied by a proration  factor.  The proration
factor is equal to the number of Shares  OrthoStrategies is offering to purchase
divided by the total number of Shares properly tendered and not withdrawn by all
shareholders. See Section 2 for more information.


                                       ii
<PAGE>

WHEN WILL I KNOW HOW MANY OF MY SHARES WERE ACCEPTED FOR PAYMENT?

      Because of the  difficulty of  determining  the number of Shares  properly
tendered and not withdrawn, OrthoStrategies does not expect that it will be able
to  announce  the final  proration  factor or  commence  payment  for any Shares
purchased pursuant to the Offer until  approximately four trading days after the
end of the offering  period.  The  preliminary  results of any proration will be
announced  by  press  release  as  promptly  as   practicable   after  the  time
OrthoStrategies  accepts Shares for payment pursuant to the Offer.  Shareholders
may obtain such preliminary  information  from the Information  Agent and may be
able to obtain  such  information  from their  brokers.  See  Section 2 for more
information.

WHAT HAPPENS TO THE SHARES THAT ARE NOT ACCEPTED FOR PURCHASE?

      If any tendered  Shares are not  accepted for payment for any reason,  the
certificates for such unpurchased Shares will be returned,  without expense,  to
the tendering  shareholder,  or such other person as the  tendering  shareholder
specifies in the Letter of  Transmittal.  This  includes any Shares not accepted
for payment as a result of proration. See Section 2 for more information.

WHAT DOES MY BOARD OF DIRECTORS THINK OF THE OFFER?

      At a meeting held on December  19, 2000,  the board of directors of Langer
unanimously  determined that the terms of the Offer are fair to, and in the best
interests  of,  the  shareholders  of Langer,  and  approved  the  Tender  Offer
Agreement and certain other agreements described in this Offer to Purchase.  The
board of directors of Langer  recommends that Langer's  shareholders  accept the
Offer and tender their Shares in the Offer.  Shareholders are advised,  however,
to obtain a current market quote for the Shares. On January 9, 2001, the closing
price of the Shares was $1.75 per Share.

WILL LANGER REMAIN A PUBLIC COMPANY AFTER THE OFFER?

      Yes, after the Offer, Langer will remain a public company and will seek to
maintain  its  eligibility  to trade on the NASDAQ  SmallCap  Market.  To remain
eligible for continued inclusion on the NASDAQ SmallCap Market, Langer must have
tangible net assets of $2 million or more,  a public  float of at least  500,000
Shares, a market value of the public float of at least $1 million,  at least 300
shareholders  and a bid price of at least $1.00 per Share. On November 25, 2000,
Langer had  stockholders'  equity of  approximately  $2.4 million and, after the
purchase of Shares pursuant to this Offer,  even if the maximum number of Shares
are  purchased,  will  have a public  float in  excess  of  600,000  shares  and
approximately  300  shareholders  of record,  the  approximate  number of record
shareholders it has today. There can be no assurance,  however, as to the future
bid price of Langer's  common stock and,  consequently,  the market value of the
public  float,  or  as to  the  ability  of  Langer  to  otherwise  satisfy  the
requirements for continued inclusion in the NASDAQ SmallCap Market.

WILL Langer's MANAGEMENT PARTICIPATE IN THE OFFER?

      OrthoStrategies   has  entered  into  an  agreement   (the   "Shareholders
Agreement") with certain  shareholders of Langer (including all of the Directors
of Langer,  Langer's President and CEO, and a significant shareholder of Langer,
and certain entities  affiliated with such persons),  which in the aggregate own
1,342,273  Shares,  in which these  persons and their  affiliated  entities have
agreed to tender their Shares in the Offer.  These persons and entities  further
agreed to sell their Shares to OrthoStrategies for $1.525 per share if the Offer
is not completed or is terminated, in each case, due to the receipt by Langer or
its  shareholders  of an acquisition  proposal at a price higher than $1.525 per
Share.

      OrthoStrategies  and  Langer  have  entered  into an  agreement  with  the
Directors of Langer in their  individual  capacities,  wherein such  individuals
have agreed to resign from the board of directors of Langer upon consummation of
the Offer and to use reasonably  available efforts to elect to Langer's board of
directors  Andrew H.  Meyers and four  additional  nominees  of  OrthoStrategies
reasonably acceptable to the Board. Such agreement also contains a commitment of
Langer and OrthoStrategies to the current directors of Langer to cause Langer to
maintain its  directors'  and officers'  liability  insurance for at least three
years.

      Langer has  entered  into  agreements  with  certain  members of  Langer's
management (who are not Directors)  providing for the payment of specified bonus
and severance  amounts to these  individuals  as an incentive for them


                                      iii
<PAGE>

to remain  employed  with  Langer  until the closing of the Offer and during the
transition  period after the closing of the Offer. See "Certain  Agreements with
Langer Management" in Section 11 hereof.

IF I DECIDE NOT TO TENDER, HOW WILL THE OFFER AFFECT MY SHARES?

      If fewer than 1,332,722  Shares are validly  tendered and not withdrawn in
the Offer, then  OrthoStrategies is not obligated to purchase Shares pursuant to
the Offer and may terminate the Offer.  However, the parties to the Shareholders
Agreement  have agreed to tender an aggregate  of  1,342,273  Shares and if such
parties comply with the Shareholders Agreement, or at least 1,332,722 Shares are
otherwise  validly  tendered and not withdrawn,  and all the other conditions to
the Offer are satisfied or waived by  OrthoStrategies,  OrthoStrategies  will be
obligated to purchase up to 1,959,886 Shares pursuant to the Offer.

      The  purchase of the Shares by  OrthoStrategies  will reduce the number of
Shares that might  otherwise trade publicly and may reduce the number of holders
of the Shares,  which could  adversely  affect the liquidity and market value of
the remaining  Shares held by the public.  In addition,  upon  completion of the
Offer,  OrthoStrategies will own a majority of Langer's Shares and will have the
right  to  control  Langer.  See  Section  7 of  this  document  for  additional
information about the effect of the Offer on your Shares.

WHAT IS THE MARKET VALUE OF MY SHARES AS OF A RECENT DATE?

      On  December  28,  2000,  the last full  trading  day prior to the  public
announcement  of the Offer,  the reported  closing price of the Shares was $1.00
per Share.  On January 9, 2001,  the  reported  closing  price of the Shares was
$1.75 per Share.  You should obtain a recent market quotation for your Shares in
deciding  whether to tender them. See Section 6 of this document for recent high
and low sales prices for the Shares.

WHO IS RESPONSIBLE FOR THE PAYMENT OF TAXES AND BROKERAGE FEES?

      Shareholders of record who tender Shares directly will not be obligated to
pay brokerage  fees or  commissions  or, except as set forth in Instruction 6 of
the Letter of  Transmittal,  stock  transfer taxes on the purchase of the Shares
pursuant to the Offer.  However,  any tendering  shareholder  or other payee who
fails to complete  and sign the  Substitute  Form W-9  included in the Letter of
Transmittal  may be subject to backup federal  income tax  withholding of 31% of
the gross  proceeds  payable to such  shareholder or other payee pursuant to the
Offer.  See Section 3 for more  information.  Shareholders who hold their Shares
through a broker, dealer, commercial bank, trust company or other nominee should
check with such institution as to whether they charge any service fees.

WHO CAN I TALK TO IF I HAVE QUESTIONS ABOUT THE TENDER OFFER?

      If you have any questions you can call the  Information  Agent,  Mackenzie
Partners, Inc., at (800) 322-2885. See the back cover of this Offer to Purchase.


                                       iv
<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
Summary Term Sheet ........................................................    i
Introduction ..............................................................    1
    Section
       1. Terms of the Offer ..............................................    1
       2. Acceptance for Payment, Proration and Payment
          for the Shares ..................................................    3
       3. Procedure for Tendering Shares ..................................    4
       4. Rights of Withdrawal ............................................    6
       5. Certain Federal Income Tax Consequences of the Offer ............    7
       6. Price Range of the Shares .......................................    7
       7. Effect of the Offer on the Market for the Shares ................    8
       8. Certain Information Concerning Langer ...........................    8
       9. Certain Information Concerning OrthoStrategies ..................   10
      10. Background of the Offer; Contacts with Langer ...................   11
      11. Purpose of the Offer; Plans for Langer; The Tender
          Offer Agreement; The Shareholders
          Agreement and other Agreements ..................................   13
      12. Source and Amount of Funds ......................................   22
      13. Certain Conditions of the Offer .................................   22
      14. Dividends and Distributions .....................................   24
      15. Certain Legal Matters ...........................................   24
      16. Fees and Expenses ...............................................   25
      17. Miscellaneous ...................................................   26
<PAGE>

To the Holders of the Shares of
   The Langer Biomechanics Group, Inc.:

                                  INTRODUCTION

      OrthoStrategies Acquisition Corp. a New York corporation ("Purchaser") and
wholly-owned  subsidiary  of  OrthoStrategies,  Inc.,  a  New  York  corporation
("OrthoStrategies"), hereby offers to purchase 1,959,886 shares of common stock,
par value $.02 per share (the "Shares"), of The Langer Biomechanics Group, Inc.,
a New York corporation  ("Langer"),  which constitutes  approximately 75% of the
Shares  currently  outstanding,  at $1.525 per Share,  net to the seller in cash
(the "Share  Price"),  upon the terms and subject to the conditions set forth in
this Offer to Purchase and in the related Letter of Transmittal  (which, as they
may be amended  and  supplemented  from time to time,  together  constitute  the
"Offer").    Except   where   the   context   requires   otherwise,   the   term
"OrthoStrategies"  is used  herein  to  refer  collectively  to  OrthoStrategies
Acquisition  Corp. and  OrthoStrategies,  Inc.  Tendering  shareholders  who are
record holders of their Shares and tender  directly to the Register and Transfer
Company  (the  "Depositary")  will not be  obligated  to pay  brokerage  fees or
commissions  or,  subject to Instruction 6 of the Letter of  Transmittal,  stock
transfer taxes on the purchase of the Shares by OrthoStrategies  pursuant to the
Offer.  Shareholders who hold their Shares through a broker, dealer,  commercial
bank,  trust  company or other nominee  should  consult such  institution  as to
whether it charges any service fees in connection with the tender of Shares into
the Offer on behalf of its  clients.  OrthoStrategies  will pay all  charges and
expenses of the  Depositary  and  Mackenzie  Partners,  Inc.  (the  "Information
Agent").

      At a meeting held on December  19, 2000,  the board of directors of Langer
unanimously  determined that the terms of the Offer are fair to, and in the best
interests  of,  the  shareholders  of Langer,  and  approved  the  Tender  Offer
Agreement, dated December 28, 2000, among OrthoStrategies,  Purchaser and Langer
(the "Tender Offer  Agreement") and certain other  agreements  described in this
Offer to Purchase.

      The board of directors of Langer  recommends  that  Langer's  shareholders
accept the Offer and tender their Shares in the Offer. Shareholders are advised,
however,  to obtain a current  market quote for the Shares.  On January 9, 2001,
the closing price of the Shares was $1.75 per Share.

      Cronkite & Kissell,  financial  advisor to Langer,  has  delivered  to the
board of directors of Langer a written opinion,  dated December 28, 2000, to the
effect  that,  as of such date and based upon and  subject  to  certain  matters
described therein, the $1.525 per Share cash consideration to be received in the
Offer by holders  of Shares was fair,  from a  financial  point of view,  to the
shareholders of Langer (other than  OrthoStrategies and its affiliates).  A copy
of  Cronkite  &  Kissell's  opinion,  which  sets  forth the  assumptions  made,
procedures   followed,   matters   considered  and  limitations  on  the  review
undertaken,  is attached  as an exhibit to Langer's  Solicitation/Recommendation
Statement  on Schedule  14D-9 (the  "Schedule  14D-9"),  which has been filed by
Langer with the  Securities  and Exchange  Commission  (the "SEC") in connection
with the Offer and which is being mailed to shareholders herewith.  Shareholders
are urged to, and should, read Cronkite & Kissell's opinion carefully and in its
entirety.

      The Offer is  conditioned  upon,  among other things,  there being validly
tendered and not withdrawn at least 1,332,722  Shares,  which constitutes 51% of
the outstanding  Shares.  The Offer is also subject to the other  conditions set
forth in this Offer to Purchase. See Section 13.

      According to Langer,  as of December 28, 2000 there were 2,613,181  Shares
outstanding and there were 301,000 Shares issuable pursuant to options, warrants
and other  rights  outstanding,  of which  225,000  options  are to be  redeemed
pursuant to the Shareholders Agreement. See Section 11.

      This Offer To  Purchase  and the  related  Letter of  Transmittal  contain
important  information  and they  should be read in their  entirety  before  any
decision is made with respect to the Offer.

1. Terms of the Offer

      Upon the  terms  and  subject  to the  conditions  set  forth in the Offer
(including  the  terms  and  conditions  set  forth in  Section  13 (the  "Offer
Conditions") and, if the Offer is extended or amended,  the terms and conditions
of such extension or amendment),  OrthoStrategies  will accept for payment,  and
pay for,  1,959,886  Shares  validly  tendered and not withdrawn as permitted by
Section 4, on or prior to the  Expiration  Date (as defined  herein).  The price
will be $1.525 per  Share,  net to the  seller in cash.  If more than  1,959,886
Shares are validly  tendered  and not  withdrawn at the  Expiration  Date of the
Offer,  OrthoStrategies  will  purchase  Shares  on a pro  rata  basis  from


                                       1
<PAGE>

all tendering shareholders as explained herein. The term "Expiration Date" means
12:00  midnight,  New York City time, on Thursday  February 8, 2001,  unless and
until  OrthoStrategies  extends the period for which the Offer is open, in which
event the term  "Expiration  Date"  means the latest  time and date on which the
Offer,  as so extended  by  OrthoStrategies,  expires.  The period from the date
hereof until 12:00  midnight,  New York City time,  on February 8, 2001, as such
period may be extended,  is referred to as the "Offering  Period." The condition
that there be validly  tendered and not withdrawn at least  1,332,722  Shares is
referred to as the "Tender Offer Condition."

      For  purposes of the Offer,  a  "business  day" means any day other than a
Saturday,  Sunday or federal  holiday and consists of the time period from 12:01
a.m. through 12:00 midnight, New York City time.

      Subject  to  the  applicable  regulations  of  the  SEC,   OrthoStrategies
expressly  reserves the right, in its sole  discretion,  to waive,  set forth or
change any term and condition of the Offer;  provided,  that,  unless previously
approved by Langer in writing,  no provision  may be set forth or changed  which
decreases  the  price  per  Share  payable  in the  Offer,  changes  the form of
consideration  payable  in the  Offer  or  imposes  conditions  to the  Offer in
addition to those set forth in the Tender Offer  Agreement  that are  materially
adverse to the  holders of the  Shares.  Without  the prior  written  consent of
Langer,  OrthoStrategies  cannot extend the expiration  date of the Offer beyond
March 31, 2001;  further,  once the conditions to the Offer have been satisfied,
OrthoStrategies cannot extend the Offer for more than five business days without
the consent of Langer.  During any such  extension of the Offering  Period,  all
Shares  previously  tendered and not withdrawn will remain subject to the Offer,
subject to the right of a tendering  shareholder to withdraw such  shareholder's
Shares. See Section 4.

      Any  extension,  delay,  termination  or  amendment  of the Offer  will be
followed  as  promptly  as  practicable  by public  announcement  thereof,  such
announcement  in the case of an  extension to be issued no later than 9:00 a.m.,
New York City time,  on the next  business  day after the  previously  scheduled
Expiration Date.  Subject to applicable law (including Rules 14d-4(d),  14d-6(c)
and 14e-1 under the  Securities  Exchange Act of 1934, as amended (the "Exchange
Act"), which require that any material change in the information published, sent
or given to shareholders  in connection with the Offer be promptly  disseminated
to shareholders in a manner reasonably  designed to inform  shareholders of such
change) and without limiting the manner in which  OrthoStrategies  may choose to
make  any  public  announcement,  OrthoStrategies  will  have no  obligation  to
publish,  advertise or otherwise  communicate any such public announcement other
than by issuing a press release or other public announcement.

      OrthoStrategies will not provide a subsequent offering period, as provided
for in Rule 14d-11 under the Exchange Act.  OrthoStrategies  confirms that if it
makes a material change in the terms of the Offer or the information  concerning
the Offer,  or if it waives a material  condition of the Offer,  OrthoStrategies
will extend the Offer to the extent  required by Rules  14d-4(d),  14d-6(c)  and
14e-1 under the Exchange Act.

      If, during the Offering  Period,  OrthoStrategies  decreases the number of
Shares  sought  pursuant to the Offer or the Share Price (which may be done only
if previously  approved by Langer in writing),  such decrease will be applicable
to all holders whose Shares are accepted for payment  pursuant to the Offer and,
if at the time  notice  of any  decrease  is first  published,  sent or given to
holders of such  Shares,  the Offer is  scheduled  to expire at any time earlier
than the tenth  business  day from and  including  the date that such  notice is
first so  published,  sent or  given,  the  Offer  will be  extended  until  the
expiration of such ten-business day period.

      Consummation  of the Offer is also  conditioned  upon the  conditions  set
forth in Section 13. OrthoStrategies reserves the right but is not obligated, in
accordance with applicable rules and regulations of the SEC, to waive any or all
of those conditions.  If, by the Expiration Date, any or all of those conditions
have not been satisfied,  OrthoStrategies  may, prior to the Expiration Date, in
its sole discretion, elect to: (i) extend the Offer from time to time subject to
applicable withdrawal rights, retain all tendered Shares until the expiration of
the Offer, as extended, subject to the terms of the Offer; (ii) waive all of the
unsatisfied  conditions  and,  subject to complying  with  applicable  rules and
regulations of the SEC,  accept for payment up to a maximum of 1,959,886  Shares
so tendered,  subject to the pro rata  provisions;  or (iii) terminate the Offer
and not  accept for  payment  any  Shares  and  return  all  tendered  Shares to
tendering  shareholders.  In the event that OrthoStrategies waives any condition
set forth in Section  13, the SEC may, if the waiver is deemed to  constitute  a
material  change to the  information  previously  provided to the  shareholders,
require that the Offer remain open for an additional  period of time and/or that
OrthoStrategies disseminate information concerning such waiver.


                                       2
<PAGE>

      Langer has provided  OrthoStrategies  with Langer's  shareholder lists and
security position listings for the purpose of disseminating the Offer to holders
of the Shares.  This Offer to Purchase,  the related Letter of  Transmittal  and
other relevant  materials will be mailed by OrthoStrategies to record holders of
the Shares and will be furnished by OrthoStrategies to brokers,  dealers, banks,
trust companies and similar persons whose names, or the names of whose nominees,
appear  on  the  shareholder  lists  or,  if  applicable,   who  are  listed  as
participants in a clearing agency's  security  position listing,  for subsequent
transmittal to beneficial owners of the Shares.

2. Acceptance for Payment, Proration and Payment for the Shares

      Upon the terms and subject to the  conditions of the Offer  (including the
Offer  Conditions  and,  if the  Offer is  extended  or  amended,  the terms and
conditions of any such extension or amendment),  OrthoStrategies will accept for
payment, and will pay for, all Shares validly tendered and not withdrawn,  up to
a maximum of 1,959,886  Shares.  The price will be $1.525 per Share,  net to the
seller in cash.  If more than  1,959,886  Shares are  validly  tendered  and not
withdrawn,  OrthoStrategies  will accept for  purchase an amount of the tendered
Shares equal to 1,959,886  Shares, on a pro rata basis from each shareholder who
has validly tendered Shares pursuant to the Offer, promptly after the Expiration
Date.  Subject  to  compliance  with  Rule  14e-1(c)  under  the  Exchange  Act,
OrthoStrategies  expressly  reserves  the right to delay  payment  for Shares in
order to comply in whole or in part with any applicable law.

      In  the  event   that   proration   of   tendered   Shares  is   required,
OrthoStrategies  will  determine  the  appropriate  proration  factor as soon as
practicable  following  the  Expiration  Date.  Proration  for each  shareholder
tendering   Shares  will  be  based  on  the  ratio  of  the  number  of  Shares
OrthoStrategies  is offering to purchase to the total number of Shares  properly
tendered  and not  withdrawn  by all  shareholders  (with  adjustments  to avoid
purchases of fractional  shares).  Because of the difficulty in determining  the
number of Shares  properly  tendered  (including  Shares  tendered by guaranteed
delivery   procedures   described  in  Section  3  below)  and  not   withdrawn,
OrthoStrategies  does not  expect  that it will be able to  announce  the  final
proration factor or commence  payment for any Shares  purchased  pursuant to the
Offer until  approximately  four trading  days after the  Expiration  Date.  The
preliminary  results of any  proration  will be  announced  by press  release as
promptly as practicable after the Expiration Date.  Shareholders may obtain such
preliminary  information from the Information  Agent and from their brokers.  In
the event of any  proration,  the Depositary  will select  certain  identifiable
Shares for payment from the total Shares properly  tendered and not withdrawn by
a shareholder in accordance with such shareholder's  directions,  if any, as set
forth in such shareholder's Letter of Transmittal.

      For purposes of the Offer, OrthoStrategies will be deemed to have accepted
for  payment  the  Shares  validly  tendered  and  not  withdrawn,  if and  when
OrthoStrategies gives oral or written notice to the Depositary of its acceptance
for  payment  of such  Shares  pursuant  to the  Offer.  As noted,  if more than
1,959,886  Shares are validly  tendered and not withdrawn at the Expiration Date
of the Offer,  OrthoStrategies  will  accept for  purchase  Shares on a pro rata
basis. Payment for any Shares accepted for payment pursuant to the Offer will be
made by deposit of the purchase price therefor with the  Depositary,  which will
act as  agent  for the  tendering  shareholders  for the  purpose  of  receiving
payments from  OrthoStrategies  and transmitting  such payments to the tendering
shareholders. In all cases, payment for any Shares accepted for payment pursuant
to the Offer will be made only after  timely  receipt by the  Depositary  of (i)
certificates  for such Shares (or a timely  Book-Entry  Confirmation (as defined
below) with  respect  thereto),  (ii) the Letter of  Transmittal  (or a manually
signed  facsimile  thereof),  properly  completed  and duly  executed,  with any
required  signature  guarantees,  or, in the case of a Book-Entry  Transfer,  an
Agent's  Message (as defined below) in lieu of a Letter of Transmittal and (iii)
any other documents required by the Letter of Transmittal.  Accordingly, payment
may be made to  tendering  shareholders  at  different  times if delivery of the
certificates  and other required  documents occur at different  times. The price
paid to any holder of the Shares pursuant to the Offer will be the highest price
per Share paid to any other holder of such Shares pursuant to the Offer.

      Under no circumstances  will interest on the  consideration to be paid for
the Shares be paid,  regardless  of any  extension  of the Offer or any delay in
making such payment.

      If any tendered Shares are not accepted for payment  pursuant to the terms
and conditions of the Offer for any reason,  including as a result of proration,
or if certificates are submitted for more Shares than are tendered, certificates


                                       3
<PAGE>

for such unpurchased Shares will be returned,  without expense, to the tendering
shareholder,  or such other person as the tendering shareholder specifies in the
Letter of  Transmittal,  as promptly as practicable  following the expiration or
termination  of the Offer.  In the case of any Shares  delivered  by  Book-Entry
Transfer into the Depositary's  account at the Book-Entry  Transfer Facility (as
defined  below)  pursuant to the  procedures set forth in Section 3, such Shares
will be credited to such account maintained at the Book-Entry  Transfer Facility
as the tendering shareholder specifies in the Letter of Transmittal, as promptly
as practicable  following the expiration or termination of the Offer. If no such
instructions  are given  with  respect  to any Shares  delivered  by  Book-Entry
Transfer,  any such  Shares not  tendered or not  purchased  will be returned by
crediting  the account at the  Book-Entry  Transfer  Facility  designated in the
Letter of Transmittal as the account from which such Shares were delivered.

      OrthoStrategies  reserves  the right to  transfer or assign in whole or in
part from time to time to one or more of its direct or indirect  subsidiaries or
to the  individuals  and entities named in Section 12, the right to purchase all
or any  portion  of the Shares  tendered  pursuant  to the  Offer,  but any such
transfer or assignment will not relieve OrthoStrategies of its obligations under
the Offer and will in no way prejudice the rights of tendering  shareholders  to
receive  payment  for any Shares  validly  tendered  and  accepted  for  payment
pursuant to the Offer.

3. Procedure for Tendering Shares

      Valid Tender. To tender Shares pursuant to the Offer,  either (i) a Letter
of Transmittal (or a manually signed facsimile  thereof) properly  completed and
duly executed in accordance with the  instructions of the Letter of Transmittal,
together with any required signature  guarantees and certificates for the Shares
to be tendered, or, in the case of a Book-Entry Transfer, an Agent's Message (in
lieu of a Letter of  Transmittal),  and any  other  required  documents  must be
received by the  Depositary  prior to the  Expiration  Date,  at its address set
forth  on the back  cover  of this  Offer  to  Purchase  or (ii)  the  tendering
shareholder must comply with the guaranteed delivery procedures set forth below.

      Book-Entry  Delivery.  The Depositary will establish accounts with respect
to  the  Shares  at The  Depository  Trust  Company  (the  "Book-Entry  Transfer
Facility")  for purposes of the Offer within two business days after the date of
this Offer to Purchase.  Any financial  institution that is a participant in the
Book-Entry  Transfer  Facility's  systems  may make  Book-Entry  Transfer of the
Shares by causing the Book-Entry  Transfer Facility to transfer such Shares into
the Depositary's  account in accordance with the Book-Entry  Transfer Facility's
procedures for such transfer.  However,  although  delivery of the Shares may be
effected  through  Book-Entry  Transfer,  either a Letter of  Transmittal  (or a
manually  signed  facsimile  thereof),  properly  completed  and duly  executed,
together with any required signature  guarantees,  or an Agent's Message in lieu
of the Letter of  Transmittal,  and any other required  documents,  must, in any
case, be  transmitted to and received by the Depositary at its address set forth
on the back cover of this  Offer to  Purchase  by the  Expiration  Date,  or the
tendering  shareholder  must  comply  with the  guaranteed  delivery  procedures
described below.  The  confirmation of a Book-Entry  Transfer of the Shares into
the Depositary's  account at the Book-Entry Transfer Facility as described above
is referred to herein as a "Book-Entry Confirmation." The term "Agent's Message"
means a message transmitted by the Book-Entry Transfer Facility to, and received
by, the Depositary and forming a part of a Book-Entry Confirmation, which states
that the  Book-Entry  Transfer  Facility has received an express  acknowledgment
from the participant in the Book-Entry  Transfer  Facility  tendering the Shares
which are the subject of such Book-Entry Confirmation, that such participant has
received  and agrees to be bound by the terms of the Letter of  Transmittal  and
that  OrthoStrategies  may  enforce  such  agreement  against  the  participant.
Delivery of documents to the Book-Entry Transfer Facility in accordance with the
Book-Entry  Transfer  Facility's  procedures does not constitute delivery to the
Depositary.

      The method of delivery of any Shares,  the Letter of  Transmittal  and all
other required  documents,  including  delivery through the Book-Entry  Transfer
Facility, is at the election and risk of the tendering shareholder.  Shares will
be deemed delivered only when actually received by the Depositary (including, in
the case of a Book-Entry Transfer, by Book-Entry  Confirmation).  If delivery is
by mail, it is recommended that the shareholder use properly insured  registered
mail with return  receipt  requested.  In all cases,  sufficient  time should be
allowed to ensure timely delivery.

      Signature  Guarantees.  Except as otherwise provided below, all signatures
on a  Letter  of  Transmittal  must be  guaranteed  by a  financial  institution
(including most commercial  banks,  savings and loan  associations and brokerage
houses) that is a participant in the Security Transfer Agents Medallion Program,
the New York Stock Exchange Medallion  Signature  Guarantee Program or the Stock
Exchange  Medallion Program (each, an "Eligible  Institution").  Signatures on a
Letter of Transmittal need not be guaranteed (i) if the Letter of Transmittal is
signed


                                       4
<PAGE>

by the registered holder (which term, for purposes of this section, includes any
participant in the Book-Entry  Transfer Facility's systems whose name appears on
a security  position  listing as the owner of the Shares) of the Shares tendered
therewith and such registered holder has not completed the box entitled "Special
Payment Instructions" or the box entitled "Special Delivery Instructions" on the
Letter of  Transmittal or (ii) if such Shares are tendered for the account of an
Eligible Institution.  See Instructions 1 and 5 of the Letter of Transmittal. If
the  certificates  for any Shares are  registered  in the name of a person other
than the  signer of the  Letter of  Transmittal,  or if payment is to be made or
certificates for any Shares not tendered or not accepted for payment,  including
as a  result  of  proration,  are to be  returned  to a  person  other  than the
registered   holder  of  the   certificates   surrendered,   then  the  tendered
certificates  must be endorsed or accompanied by  appropriate  stock powers,  in
either case  signed  exactly as the name or names of the  registered  holders or
owners appear on the  certificates,  with the signatures on the  certificates or
stock powers  guaranteed as described  above.  See  Instructions  1 and 5 of the
Letter of Transmittal.

      Guaranteed  Delivery.  A shareholder who desires to tender Shares pursuant
to the Offer and whose certificates for any Shares are not immediately available
or who cannot  comply with the  procedure  for  Book-Entry  Transfer on a timely
basis, or who cannot deliver all required  documents to the Depositary  prior to
the  Expiration  Date, may tender such Shares by following all of the procedures
set forth below:

            (i) such tender is made by or through an Eligible Institution;

            (ii) a properly  completed  and duly  executed  Notice of Guaranteed
      Delivery,  substantially  in the  form  provided  by  OrthoStrategies,  is
      received by the  Depositary,  as provided  below,  prior to the Expiration
      Date; and

            (iii) the certificates  for all tendered Shares,  in proper form for
      transfer (or a Book-Entry  Confirmation  with respect to all such Shares),
      together with a properly completed and duly executed Letter of Transmittal
      (or a manually  signed  facsimile  thereof),  with any required  signature
      guarantees (or, in the case of a Book-Entry  Transfer,  an Agent's Message
      in lieu of the Letter of Transmittal),  and any other required  documents,
      are received by the  Depositary  within three business days after the date
      of execution of such Notice of Guaranteed Delivery.

      The  Notice  of  Guaranteed  Delivery  may be  delivered  by  hand  to the
Depositary or transmitted  by telegram,  facsimile  transmission  or mail to the
Depositary  and must include a guarantee by an Eligible  Institution in the form
set forth in such Notice of Guaranteed Delivery.

      Other  Requirements.  Notwithstanding  any  provision  of  this  document,
payment for the Shares  accepted  for payment  pursuant to the Offer will in all
cases be made only after timely receipt by the Depositary of the instruments and
documents referred to in Section 2.

      Tender  Constitutes an Agreement.  The valid tender of any Shares pursuant
to one of the procedures  described  above will  constitute a binding  agreement
between the tendering shareholder and OrthoStrategies upon the terms and subject
to the  conditions of the Offer,  including the right to withdraw such Shares as
described in Section 4.

      Appointment.  By executing a Letter of Transmittal as set forth above, the
tendering  shareholder will irrevocably  appoint designees of OrthoStrategies as
such shareholder's  attorneys-in-fact and proxies in the manner set forth in the
Letter of Transmittal,  each with full power of substitution, to the full extent
of such  shareholder's  rights  with  respect  to the  Shares  tendered  by such
shareholder and accepted for payment by OrthoStrategies  and with respect to any
and all non-cash  dividends,  distributions,  rights, and other shares of common
stock or other  securities  issued or  issuable  in respect of such Shares on or
after December 28, 2000 (collectively,  "Distributions").  All such proxies will
be considered coupled with an interest in the tendered Shares.  Such appointment
will be effective  when, and only to the extent that,  OrthoStrategies  deposits
the payment for such Shares with the Depositary. All such powers of attorney and
proxies will be irrevocable and will be deemed granted in  consideration  of the
acceptance for payment by  OrthoStrategies  of the Shares tendered in accordance
with the terms of the Offer.  Upon the  effectiveness of such  appointment,  all
prior powers of attorney, proxies and consents given by such shareholder will be
revoked, and no subsequent powers of attorney, proxies and consents may be given
(and,  if  given,   will  not  be  deemed   effective  unless  consented  to  by
OrthoStrategies).  OrthoStrategies'  designees will be empowered to exercise all
voting and other rights of such shareholder with respect to such Shares


                                       5
<PAGE>

(and any and all  Distributions)  as they,  in their sole  discretion,  may deem
proper at any  annual,  special  or  adjourned  meeting of the  shareholders  of
Langer,  actions by written  consent in lieu of any such  meeting or  otherwise.
OrthoStrategies  reserves the right to require  that, in order for any Shares to
be deemed validly  tendered,  immediately  upon  OrthoStrategies  depositing the
payment  for such Shares with the  Depositary,  OrthoStrategies  must be able to
exercise full voting,  consent and other rights with respect to such Shares (and
any and all Distributions).

      Determination  of  Validity.  All  questions  as to  the  validity,  form,
eligibility  (including  time of receipt)  and  acceptance  of any tender of the
Shares will be  determined  by  OrthoStrategies  in its sole  discretion,  which
determination will be final and binding.  OrthoStrategies  reserves the absolute
right to reject any and all tenders determined by it not to be in proper form or
the  acceptance  for  payment of or payment  for which  may,  in the  opinion of
OrthoStrategies'  counsel,  be  unlawful.   OrthoStrategies  also  reserves  the
absolute right to waive any defect or  irregularity  in the tender of any Shares
of any particular  shareholder  whether or not similar defects or irregularities
are waived in the case of other  shareholders.  No tender of any Shares  will be
deemed to have been validly made until all defects and  irregularities  relating
thereto have been cured or waived. None of OrthoStrategies,  the Depositary, the
Information  Agent,  or any  other  person  will  be  under  any  duty  to  give
notification of any defects or  irregularities in tenders or incur any liability
for failure to give any such notification. OrthoStrategies interpretation of the
terms and  conditions  of the Offer  (including  the Letter of  Transmittal  and
Instructions thereto) will be final and binding.

      Backup  Withholding.  In order to avoid  "backup  withholding"  of federal
income tax on payments of cash pursuant to the Offer, a shareholder surrendering
Shares in the Offer must,  unless an exemption  applies,  provide the Depositary
with such  shareholder's  correct  taxpayer  identification  number ("TIN") on a
Substitute  Form W-9 and  certify  under  penalty  of  perjury  that such TIN is
correct and that such  shareholder  is not subject to backup  withholding.  If a
shareholder does not provide such shareholder's  correct TIN or fails to provide
the certifications described above, the Internal Revenue Service (the "IRS") may
impose a penalty on such  shareholder  and  payment of cash to such  shareholder
pursuant  to the  Offer  may be  subject  to  backup  withholding  of  31%.  All
shareholders  surrendering Shares pursuant to the Offer should complete and sign
the main  signature  form and the  Substitute  Form W-9  included as part of the
Letter of Transmittal to provide the information and certification  necessary to
avoid backup withholding (unless an applicable exemption exists and is proved in
a  manner   satisfactory  to  OrthoStrategies   and  the  Depositary).   Certain
shareholders  (including,  among others,  all  corporations  and certain foreign
individuals and entities) are not subject to backup  withholding.  Non-corporate
foreign shareholders should complete and sign the main signature form and a Form
W-8,  Certificate  of Foreign  Status,  a copy of which may be obtained from the
Depositary,   in  order  to  avoid  backup   withholding.   See  "Important  Tax
Information" in the Letter of Transmittal.

4. Rights of Withdrawal

      Tenders of the Shares made  pursuant to the Offer are  irrevocable  except
that Shares tendered pursuant to the Offer may be withdrawn at any time prior to
the  expiration  of the Offering  Period and,  unless  theretofore  accepted for
payment by  OrthoStrategies  pursuant to the Offer, may also be withdrawn at any
time after Sunday, March 11, 2001.

      For a  withdrawal  to be  effective,  a  written,  telegraphic,  telex  or
facsimile  transmission  notice of  withdrawal  must be timely  received  by the
Depositary at its address set forth on the back cover of this Offer to Purchase.
Any such  notice  of  withdrawal  must  specify  the name of the  person  having
tendered  the Shares to be  withdrawn,  the number of the Shares to be withdrawn
and the names in which the certificate(s)  evidencing the Shares to be withdrawn
are  registered,  if different from that of the person who tendered such Shares.
The  signature(s)  on the notice of withdrawal must be guaranteed by an Eligible
Institution,  unless  such  Shares  have been  tendered  for the  account  of an
Eligible  Institution.  If Shares have been tendered  pursuant to the procedures
for Book-Entry Transfer as set forth in Section 3, any notice of withdrawal must
specify the name and number of the account at the Book-Entry  Transfer  Facility
to be credited with the withdrawn  Shares.  If certificates for the Shares to be
withdrawn have been  delivered or otherwise  identified to the  Depositary,  the
name  of the  registered  holder  and  the  serial  numbers  of  the  particular
certificates evidencing the Shares to be withdrawn must also be furnished to the
Depositary as aforesaid prior to the physical release of such certificates.  All
questions as to the form and validity  (including time of receipt) of any notice
of withdrawal  will be determined by  OrthoStrategies,  in its sole  discretion,


                                       6
<PAGE>

which  determination  will be final and binding.  None of  OrthoStrategies,  the
Depositary, the Information Agent, or any other person will be under any duty to
give  notification of any defects or  irregularities in any notice of withdrawal
or incur any liability  for failure to give such  notification.  Withdrawals  of
tendered Shares may not be rescinded,  and any Shares properly withdrawn will be
deemed not to have been validly  tendered  for  purposes of the Offer.  However,
withdrawn  Shares  may be  retendered  by  following  any one of the  procedures
described in Section 3 at any time prior to the Expiration Date.

      If  OrthoStrategies  extends the Offer,  is delayed in its  acceptance for
payment of any Shares, or is unable to accept for payment any Shares pursuant to
the Offer for any reason,  then,  without  prejudice to  OrthoStrategies  rights
under   this   Offer,   the   Depositary   may,   nevertheless,   on  behalf  of
OrthoStrategies, retain tendered Shares, but such Shares may be withdrawn to the
extent that  tendering  shareholders  are entitled to  withdrawal  rights as set
forth in this Section 4.

5. Certain Federal Income Tax Consequences of the Offer

      Sales of the Shares pursuant to the Offer will be taxable transactions for
federal  income tax purposes  and may also be taxable  under  applicable  state,
local and other tax laws.  The  consequences  of the receipt of cash in exchange
for  Shares  pursuant  to  the  Offer  may  vary  depending  on  the  particular
circumstances of a shareholder.  For federal income tax purposes,  a shareholder
whose Shares are purchased pursuant to the Offer will realize gain or loss equal
to the  difference  between the adjusted basis of the Shares sold and the amount
of cash received therefor. Such gain or loss will be capital gain or loss if the
Shares  are held as  capital  assets by the  shareholder  and will be  long-term
capital  gain or loss if the  shareholder's  holding  period in the  Shares  for
federal  income  tax  purposes  is more than one year at the time the Shares are
accepted for payment.  Long-term capital gain of a non-corporate  shareholder is
generally  subject to a maximum tax rate of 20%. A shareholder's  ability to use
capital losses to offset ordinary income is limited.

      The  income  tax  discussion  set  forth  above is  included  for  general
information only and may not be applicable to shareholders in special situations
such as  shareholders  who  received  their  Shares  upon the  exercise of stock
options or otherwise as compensation  and shareholders who are not United States
persons.  Shareholders should consult their own tax advisors with respect to the
specific tax  consequences to them, in their  particular  circumstances,  of the
Offer, including the application and effect of federal, state, local, foreign or
other tax laws.

6. Price Range of the Shares

      The Shares are traded on the NASDAQ  SmallCap Market under the symbol GAIT
with quotations reported in the NASDAQ automated quotation system. The following
table sets forth, for the periods  indicated,  the high and low reported closing
bid prices for the Shares.  The NASDAQ  quotations are between  dealers,  do not
include retail markups,  markdowns or commissions,  and may not represent actual
transactions.

                                                            Closing Bid Price
                                                           -------------------
                                                           High            Low
                                                           ----            ---
Twelve Months Ended
February 28, 1999:
      First Quarter ................................       1 9/16        1 5/16
      Second Quarter ...............................       1 7/16        1 5/16
      Third Quarter ................................       1 3/8         1 1/16
      Fourth Quarter ...............................       1 7/8         1 1/4

Twelve Months Ended
February 29, 2000:
      First Quarter ................................       2             1 1/4
      Second Quarter ...............................       1 13/16       1 5/8
      Third Quarter ................................       2             1 5/16
      Fourth Quarter ...............................       1 15/16       1 11/16


                                       7
<PAGE>

                                                            Closing Bid Price
                                                           -------------------
                                                           High            Low
                                                           ----            ---
Twelve Months Ended
February 28, 2001:
      First Quarter ................................       1 3/4         1 5/8
      Second Quarter ...............................       1 5/8         1 1/2
      Third Quarter ................................       1 5/8         1 3/8

Fourth Quarter (through December 31, 2000) .........       1 1/2         1

      On  December  28,  2000,  the last full  trading  day prior to the  public
announcement of the terms of the Offer, the reported closing bid price was $1.00
per Share.  On January 9, 2001, the reported  closing price of the Shares on the
NASDAQ  SmallCap  Market  was $1.75 per  Share.  Langer  has never paid any cash
dividends.  Shareholders  are urged to obtain a current market quotation for the
Shares.

7. Effect of the Offer on the Market for the Shares

      The purchase of any Shares by  OrthoStrategies  pursuant to the Offer will
reduce the number of the Shares  that might  otherwise  trade  publicly  and may
reduce the number of holders of the  Shares,  which could  adversely  affect the
liquidity and market value of the remaining Shares held by the public.

8. Certain Information Concerning Langer

      Langer has its principal  executive offices at 450 Commack Road, Deer Park
New York  11729.  The  telephone  number  of Langer  at such  location  is (631)
667-1200.  Langer,  which was  incorporated  in 1971,  is engaged in the design,
manufacture  and  marketing  of foot and  gait-related  biomechanical  products.
Langer's  largest  product line,  custom-made,  prescription  orthotic  devices,
accounted for  approximately  84% of revenues for the fiscal year ended February
29, 2000. Foot orthoses are contoured molds made from plastic, graphite, leather
or composite  materials,  which are placed in patients'  shoes to (i) correct or
mitigate  abnormalities in their gait and (ii) relieve symptoms  associated with
foot or postural malalignment.  These devices function by maintaining the proper
relationships  between a patient's  forefoot,  rearfoot,  leg and the horizontal
walking surface. To Langer's knowledge,  it has the greatest overall unit volume
and  revenue  in the custom  foot  orthoses  industry.  Langer's  customers  are
primarily  podiatrists,  and also include orthopedists,  physical therapists and
Orthotic & Prosthetic  ("O&P")  centers.  Langer also makes ankle foot orthoses,
boot-like   devices  which  assist   individuals   afflicted  with  neurological
impairments, foot deformities and injuries to achieve a more natural gait.

      In addition to its line of orthotic  products,  Langer has  developed  and
markets  a number  of other  products  that  help  treat  biomechanical  medical
problems related to feet and gait, including:

      o     A proprietary  medical grade soft tissue  cushioning  material named
            PPT(R),  which the Company  believes  provides  superior  protection
            against forces of pressure,  shock and shear. PPT conforms and bonds
            to a broad  array of orthotic  and  prosthetic  devices,  braces and
            assemblies; and

      o     The Pediatric  Counter  Rotation System  ("CRS"(R)),  a device which
            corrects   in-toe/out-toe   disorders  of  infancy,  while  allowing
            unrestricted movement of the feet and legs.

      Set forth below is certain summary consolidated  financial information for
each of Langer's  three fiscal  years in the period  ended  February 29, 2000 as
contained in Langer's Annual Report on Form 10-K, as well as unaudited financial
information  for the period  ended  November  25, 2000 as  contained in Langer's
Quarterly  Report on Form 10-Q.  More  comprehensive  financial  information  is
included in such  reports  (including  management's  discussion  and analysis of
financial  condition  and results of  operation)  and other  documents  filed by
Langer with the SEC, and the  following  summary is qualified in its entirety by
reference  to  such  reports  and  other  documents  and  all of  the  financial
information  and  notes  contained  therein.  Copies of such  reports  and other
documents  may be examined  at or obtained  from the SEC in the manner set forth
below.


                                       8
<PAGE>

                   Selected Consolidated Financial Information
                      (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                Nine months
                                                   ended               Year Ended
                                                ----------   ------------------------------
                                                 Nov. 25,    Feb. 29,     Feb 28,    Feb 28,
                                                   2000        2000        1999       1998
                                                   -----     -------      ------     ------
<S>                                              <C>         <C>         <C>        <C>
Consolidated Statement of Operations:
     Net Sales ...............................   $  8,691    $ 11,145    $ 10,307   $ 10,156
     Income (loss) before income taxes .......       (224)       (337)        329        370
     Provision for (benefit from) income taxes          3          (2)         25          5
     Net Income (loss) .......................       (227)       (335)        304        365
     Earnings per share:
     Net income (loss) per common Share:
     Basic ...................................      (0.09)      (0.13)       0.12       0.14
     Diluted .................................      (0.09)      (0.13)       0.12       0.14

Weighted average number of common shares:
     Basic ...................................      2,578       2,571       2,854      2,585
     Diluted .................................      2,578       2,571       2,607      2,658
     Cash dividends per share ................         --          --          --         --

Consolidated Balance Sheets:
     Working Capital .........................      1,536       1,715       2,423      2,090
     Total Assets ............................      4,507       4,738       5,125      4,848
     Long-term Liabilities (excluding
       current maturities) ...................        245         277         305        375
     Stockholders' Equity ....................      2,436       2,536       2,934      2,663
</TABLE>

      Except as otherwise set forth herein,  the information  concerning  Langer
contained in this Offer to Purchase  has been taken from or based upon  publicly
available  documents  and records on file with the SEC and other public  sources
and is qualified in its entirety by reference thereto.  Although OrthoStrategies
has no knowledge that would indicate that any statements  contained herein based
on  such  documents  and  records  are  untrue,   OrthoStrategies   cannot  take
responsibility for the accuracy or completeness of the information  contained in
such  documents  and  records,  or for any failure by Langer to disclose  events
which may have occurred or may affect the  significance  or accuracy of any such
information but which are unknown to OrthoStrategies.

      Available Information.  Langer is subject to the information and reporting
requirements  of the  Exchange Act and in  accordance  therewith is obligated to
file  reports  and other  information  with the SEC  relating  to its  business,
financial  condition and other  matters.  Information,  as of particular  dates,
concerning Langer's directors and officers,  their  remuneration,  stock options
granted to them,  the  principal  holders of Langer's  securities,  any material
interests  of such  persons in  transactions  with  Langer and other  matters is
required  to  be  disclosed  in  proxy   statements   distributed   to  Langer's
shareholders  and filed with the SEC. Such reports,  proxy  statements and other
information  should be available for inspection at the public  reference room at
the SEC's offices at 450 Fifth Street,  N.W.,  Washington,  D.C.  20549 and also
should be available for  inspection  and copying at the regional  offices of the
SEC located at Seven World Trade Center,  13th Floor,  New York,  New York 10048
and Citicorp  Center,  500 West Madison Street,  Suite 1400,  Chicago,  Illinois
60611.  Copies may be  obtained  by mail,  upon  payment of the SEC's  customary
charges, by writing to its principal office at 450 Fifth Street, N.W., Judiciary
Plaza,  Washington,  D.C. 20549, and can be obtained electronically on the SEC's
Website at http://www.sec.gov.


                                       9
<PAGE>

9. Certain Information Concerning OrthoStrategies

      OrthoStrategies,  Inc. and OrthoStrategies Acquisition Corp. were recently
organized  under the laws of the State of New York.  Purchaser is a wholly-owned
subsidiary   of   OrthoStrategies.   The  mailing   address  of  Purchaser   and
OrthoStrategies is 31 The Birches,  Roslyn Estates, New York 11576. The business
telephone number of Purchaser and OrthoStrategies is 516-481-9178.

      OrthoStrategies  was founded by Andrew H. Meyers, to pursue an acquisition
of one or more companies  engaged in the  manufacture of orthotic and prosthetic
devices for persons afflicted with  musculoskeletal  disorders or injuries.  The
only shareholder,  director and officer of  OrthoStrategies is Andrew H. Meyers.
OrthoStrategies  has not engaged in any substantive  business  activities  other
than activities related to the negotiation, execution and delivery of the Tender
Offer  Agreement  with Langer,  and the  agreements  contemplated  thereby,  and
activities related to the commencement of the Offer.

      Purchaser  was  founded to effect  the  acquisition  of Langer.  Andrew H.
Meyers is the sole director and officer of Purchaser.  Purchaser has not engaged
in any substantive  business  activities  other than  activities  related to the
negotiation,  execution and delivery of the Tender Offer  Agreement with Langer,
and  the  agreements   contemplated  thereby,  and  activities  related  to  the
commencement of the Offer.

      Andrew H.  Meyers,  44, has been an executive  in the  orthotics  industry
since 1979. From March, 1992 to December, 1996, Mr. Meyers was the President and
Chief Executive Officer of Advanced Orthopedic  Technologies,  Inc. ("AOTI"),  a
publicly held company which,  during such period,  grew from annual  revenues of
approximately  $5  million in 1992 to  approximately  $18  million  in 1996.  In
December,  1996, AOTI was acquired by NovaCare Orthotics and Prosthetics,  Inc.;
Mr. Meyers  supervised its integration  into NovaCare,  and from December,  1996
until July,  1999, Mr. Meyers served  NovaCare in various  executive  positions,
most  recently  being  Executive  Vice  President of Sales and  Marketing.  When
NovaCare sold its orthotics and prosthetics  business to Hanger Orthopedic Group
in July, 1999, Mr. Meyers became Hanger's Executive Vice President of Marketing,
Public Relations and Strategic Planning. In September, 2000, Mr. Meyers resigned
from Hanger to pursue his strategy of acquiring a company in the musculoskeletal
industry.

      Mr.  Meyers  is a  Certified  Prosthetist  Orthotist  and  was  one of the
founders and principals of the predecessor  company of AOTI established in 1982.
Mr.  Meyers  has a  significant  professional  presence  in the  musculoskeletal
industry,  has lectured widely and has held numerous  professional  and teaching
appointments at hospitals and educational institutions.

      Mr. Meyers invited Greg Nelson and Kanders & Company, Inc., to participate
with him in OrthoStrategies' acquisition of control of Langer.

      Warren B. Kanders,  43, is the sole  shareholder,  director and officer of
Kanders & Company,  Inc., a consulting  and  investment  firm.  Mr.  Kanders has
served as Chairman of the Board of Directors of Armor Holdings,  Inc., a company
listed on the New York Stock Exchange,  since January 1996. From October 1992 to
May 1996,  Mr. Kanders  served as  Vice-Chairman  of the Board of Benson Eyecare
Corporation.  From June 1992 to March 1993,  Mr. Kanders was the President and a
director of Pembridge Holdings.

      Greg  Nelson,  51,  was a  co-founder  of  DonJoy  Orthopedics,  a  sports
medicine,  knee  brace  company,  which  today  is  called  dj  Orthopedics.  As
President,  he helped grow the company from a start-up operation to annual sales
over $70 million.  DonJoy was sold to Smith+Nephew,  a British-based  healthcare
company in 1987. Mr. Nelson is currently Chairman of BREG, Inc., which he helped
co-found  in 1990.  BREG is a diverse  orthopedic  company  with  product  lines
including cold therapy, pain care products, knee bracing, and soft goods.

      OrthoStrategies  has no material  assets.  However,  Mr. Meyers,  Mr. Greg
Nelson and Kanders & Company,  Inc. have agreed in a funding  commitment  letter
("Commitment  Letter") to provide  OrthoStrategies  with the funds  necessary to
acquire the Shares tendered in the Offer and to pay related fees and expenses or
to directly fund and acquire the shares which  OrthoStrategies  has the right to
purchase in the Offer.

      Kanders &  Company,  Inc.  has the right to assign a portion of the Shares
allocated for acquisition by it; provided that no such assignment  shall relieve
it of the obligation to fund the entire  purchase price of the Shares  allocated
for  purchase  by Kanders & Company,  Inc.  Andrew H.  Meyers,  Greg  Nelson and
Kanders  &  Company,  Inc.,  may hold  their  shares  in  corporations,  limited
liability companies, partnerships, or trusts owned and controlled by them.


                                       10
<PAGE>

      OrthoStrategies   believes   that   financial   information   relating  to
OrthoStrategies, Andrew H. Meyers, Greg Nelson and Kanders & Company, Inc is not
material  to a  decision  to sell or  tender  Shares in the Offer or to hold and
retain Shares.  OrthoStrategies  bases such belief on the fact that the Offer is
for  cash,  there is no  financing  condition  to the  Offer,  none of Andrew H.
Meyers,  Greg Nelson and Kanders & Company,  Inc will incur any  indebtedness in
connection with the funding of the purchase of Shares,  and none of such parties
or their  affiliates  or  assignees  have  continuing  commitments  to Langer to
provide  any  financial  support to  Langer.  Andrew H.  Meyers  has  personally
committed to Kanders & Company,  Inc. that Mr. Meyers would provide  $500,000 of
collateral  to  support a  $1,000,000  line of credit to Langer by State Bank of
Long Island,  effective on the closing of the Offer;  that if State Bank of Long
Island  does not  implement  such line of credit to Langer on the Closing of the
Offer,  Mr. Meyers will provide $500,000 to Langer either as a loan, by exercise
of OS Options having an aggregate  exercise  price of $500,000,  or by providing
$500,000 in collateral to induce  another bank to provide an equivalent  line of
credit ("Credit Obligation").  Mr. Meyer's net worth is in excess of $2 million,
which is in excess of his funding  commitments to OrthoStrategies to provide the
purchase price for the Shares in the Offer and pay for his share of related fees
and expenses of OrthoStrategies  and his undertaking to Kanders & Company,  Inc.
to satisfy such Credit Obligation. In addition, the net worth of Greg Nelson and
Kanders & Company, Inc. exceeds $1 million and $2 million,  respectively,  which
is in excess of their  respective  funding  commitments  to  OrthoStrategies  to
provide  the  purchase  price  for the  Shares  in the  Offer  and pay for their
respective shares of any related fees and expenses of  OrthoStrategies.  Each of
Mr. Meyers, Mr. Nelson and Kanders & Company,  Inc. has sufficient  liquidity to
satisfy  such funding  commitments  to  OrthoStrategies,  and in the case of Mr.
Meyers, the Credit Obligation to Kanders & Company, Inc.

      None of  OrthoStrategies,  nor,  to the best of its  knowledge,  Andrew H.
Meyers,  Warren B.  Kanders,  Kanders & Company,  Inc. or Greg  Nelson,  nor any
associate or majority-owned subsidiary of OrthoStrategies,  beneficially owns or
has a right to acquire  any Shares or has  engaged  in any  transactions  in the
Shares in the past 60 days except  pursuant to the Tender  Offer  Agreement  and
Shareholders   Agreement   as  set  forth  in  Sections   10  and  11.   Neither
OrthoStrategies  nor Mr. Meyers,  Mr. Kanders,  Kanders & Company,  Inc., or Mr.
Nelson has purchased any Shares during the past two years.

      Except as set forth in  Section  10 and  Section  11,  there  have been no
negotiations,  transactions or material contacts between OrthoStrategies, or, to
the best  knowledge  of  OrthoStrategies,  any of  Andrew H.  Meyers,  Warren B.
Kanders,  Kanders & Company, Inc. or Greg Nelson, on the one hand, and Langer or
its  affiliates,  on the  other  hand,  concerning  a merger,  consolidation  or
acquisition,  a tender offer or other acquisition of securities,  an election of
directors, or a sale or other transfer of a material amount of assets. Except as
described  in  Section  10,  neither  OrthoStrategies,  nor,  to the best of its
knowledge,  any of Andrew H. Meyers, Warren B. Kanders, Kanders & Company, Inc.,
or Greg  Nelson,  has had any  transaction  with Langer or any of its  executive
officers,  directors or affiliates that would require disclosure under the rules
and  regulations  of the SEC  applicable to the Offer.  To the best knowledge of
OrthoStrategies,  none of the foregoing  entities or individuals has, within the
last five years, been convicted in a criminal proceeding, or has been a party to
any judicial or administrative proceeding that resulted in a judgment, decree or
final  order  enjoining  such  person  from  future  violations  or  prohibiting
activities  subject  to  federal  or state  securities  laws or a finding of any
violations of federal or state securities laws.

10. Background of the Offer; Contacts with Langer

      On June 8, 1998,  Mr.  Meyers  contacted  Kenneth  Granat,  a director and
significant shareholder of Langer, to ascertain whether Langer was interested in
being acquired.  On June 17, 1998, Mr. Meyers and Warren B. Kanders met with Mr.
Granat.  Another meeting was held on September 18, 1998,  among Mr. Meyers,  Mr.
Granat and Thomas I. Altholz,  another  director of Langer.  Although there were
preliminary  discussions  regarding the  possibility of Langer being acquired or
Mr.  Meyers  becoming  involved in the  management  of Langer,  no agreement was
reached at this time and Mr. Meyers determined to suspend his efforts.

      In January 2000 Mr. Meyers again contacted Mr. Granat to determine whether
there was any  interest  in selling  his  shareholdings  in Langer.  Mr.  Granat
referred Mr. Meyers to Stephen V. Ardia, Chairman of Langer. On January 6, 2000,
Mr. Ardia  explained to Mr.  Meyers that Langer was then in the midst of various
initiatives and was not interested in commencing discussions regarding any major
transactions until these initiatives had been completed.


                                       11
<PAGE>

      On July 26, 2000,  Mr.  Meyers  spoke with Mr. Ardia to ascertain  whether
Langer was then  interested in being  acquired.  Thereafter,  a  Confidentiality
Agreement  was entered into between  Langer and  OrthoStrategies  dated July 26,
2000.  Mr.  Meyers  and Mr.  Ardia  then  began a series  of  discussions  which
continued  for several  weeks  during  which they  considered  various  possible
structures for a transaction,  including the purchase of the assets of Langer, a
merger of the companies or a purchase of the shares of principal shareholders of
Langer. The Langer board of directors first considered the acquisition  proposal
from OrthoStrategies at a meeting on August 2, 2000.

      On August 10, 2000, attorneys from Herrick,  Feinstein LLP, counsel to Mr.
Meyers  and  OrthoStrategies,  contacted  Kaufman &  Moomjian,  LLC,  counsel to
Langer,  to discuss the due diligence  materials  that would need to be reviewed
and the general terms of an acquisition transaction with a view to entering into
a  letter  of  intent.  From  August  10,  2000,  through  September  14,  2000,
representatives of Langer,  including its legal counsel, had various discussions
with  representatives of OrthoStrategies  and participated in various conference
calls  during  which  they  considered  alternative   structures.   After  these
negotiations,  the board of directors  of Langer met on  September  16, 2000 and
ratified the execution of a Letter of Intent,  dated September 14, 2000, wherein
OrthoStrategies  confirmed  its interest,  subject to the  completion of its due
diligence,  to acquire Langer by means of a merger whereby Langer would become a
wholly-owned  subsidiary of  OrthoStrategies.  The Letter of Intent contemplated
that  OrthoStrategies  would pay the  shareholders  of Langer  $1.75 per  Share,
subject to adjustment  based on Langer's net worth and net working capital as of
the closing date of the merger.

      Subsequent  to the execution of the Letter of Intent,  Herrick,  Feinstein
LLP, on behalf of OrthoStrategies, delivered a letter to Langer, dated September
19,  2000,  specifying  various  documents  and  financial  and other  materials
required by  OrthoStrategies  in connection  with its review of the business and
affairs of Langer.

      During  the  course  of its due  diligence  review,  in light of  Langer's
inability to meet forecasted results of operations,  OrthoStrategies  determined
that it was not  willing to acquire all of the  outstanding  Shares of Langer on
the terms set forth in the Letter of Intent.  In October  2000,  OrthoStrategies
advised Langer that it was no longer  interested in consummating the transaction
contemplated by the Letter of Intent, but that  nevertheless,  it was interested
in acquiring a controlling interest in Langer at a lower price.  Representatives
of  OrthoStrategies  and Langer  continued  to  negotiate  modifications  to the
proposed  transaction.  The Langer  board of  directors  met October  19,  2000,
October 25, 2000, October 31, 2000, and November 8, 2000 to review the status of
negotiations with OrthoStrategies.

      These   discussions   resulted   in  the   execution   and   delivery   by
OrthoStrategies  and  Langer of a document  captioned  "Term  Sheet for  Revised
Transaction"  dated  November  10,  2000  ("Term  Sheet").  In  the  Term  Sheet
OrthoStrategies confirmed its intent, subject to its continued due diligence and
the financial  results of Langer, to conduct a tender offer for up to 75% of the
outstanding  Shares of Langer at a price of  $1.525  per  share,  with a minimum
required  tender  of 51% of the  outstanding  Shares.  The  Term  Sheet  further
provided  that  certain  shareholders  of  Langer,  holding  in  the  aggregate,
approximately 51.4% of the outstanding Shares would, at the time OrthoStrategies
and Langer  entered  into the Tender  Offer  Agreement,  enter into an agreement
wherein  they would  agree to tender  their  shares in the Offer and, in certain
events,  to sell their Shares directly to  OrthoStrategies.  The Term Sheet also
provided that Langer would grant  OrthoStrategies  options to purchase 1,400,000
Shares exercisable for 180 days after closing of the tender offer, at an initial
exercise price of $1.525 per share, increasing to $1.550 per share 91 days after
Closing;  $1.575 per share 121 days after Closing;  and $1.60 per share 151 days
after Closing.

      The Langer  board of  directors  met on  November  11,  2000 to review and
discuss  the final  form of the Term  Sheet,  which had been  circulated  to the
Directors prior to the meeting; the Board approved the Term Sheet and authorized
Steven V. Ardia, Chairman, to execute and deliver the Term Sheet.

      Subsequent to the execution of the Term Sheet,  OrthoStrategies  continued
its  review  of  the   business   and   affairs  of  Langer,   and   counsel  to
OrthoStrategies,   counsel  to  Langer  and   counsel  to  the  parties  to  the
Shareholders  Agreement,  negotiated and exchanged  several drafts of the Tender
Offer Agreement, Shareholders Agreement and other agreements described herein.

      On November 29, 2000,  the Langer Board of Directors  met and reviewed the
negotiations  of the definitive  agreements  with  OrthoStrategies  and the open
issues  and  authorized  Steven  V.  Ardia,  Chairman  of  Langer,  to  continue
negotiations with OrthoStrategies.


                                       12
<PAGE>

      The Board of  Directors  of Langer held a meeting on December  10, 2000 to
consider in general the progress of negotiations  with  OrthoStrategies,  and on
December 11,  2000,  the board of directors of Langer held a meeting to consider
the drafts  which had been  proposed of the Tender Offer  Agreement  and related
documents. At the December 11, 2000, meeting, representatives of OrthoStrategies
made a presentation regarding its proposal.

      The Board of  Directors  of Langer met on December  19, 2000 to review the
substantially  final definitive Tender Offer Agreement,  Shareholders  Agreement
and related  agreements;  determined that it was in the best interests of Langer
to proceed with the proposed  transaction with  OrthoStrategies;  and authorized
the  execution  of such  agreements  by Steven V.  Ardia,  Chairman,  subject to
changes approved by him.

11. Purpose of the Offer; Plans for Langer; The Tender Offer Agreement; The
    Shareholders Agreement and other Agreements

      Purpose.  The  purpose of the Offer is to acquire for cash up to a maximum
of 1,959,886 Shares, which constitutes approximately 75% of the Shares of Langer
currently  outstanding.  After  completion of the purchase of Shares pursuant to
the Offer, OrthoStrategies and/or its assignees will collectively own all of the
Shares acquired in the Offer.

      Plans for Langer. As of the date of this Offer to Purchase,  and except as
otherwise  described  in this  Section  11,  OrthoStrategies  does  not have any
current plans or proposals with respect to Langer that relate to or would result
in:

            a. Any extraordinary transaction,  such as a merger,  reorganization
      or liquidation, involving Langer or any of its subsidiaries;

            b. Any purchase,  sale or transfer of a material amount of assets of
      Langer or any of its subsidiaries;

            c. Any material change in the present dividend policy,  indebtedness
      or capitalization of Langer;

            d. Any other  material  change in Langer's  corporate  structure  or
      business;

            e. The Shares of Langer  ceasing to be authorized to be quoted in an
      automated quotations system operated by a national securities association;
      or

            f. Any class of equity  securities of Langer  becoming  eligible for
      termination of registration under Section 12(g) (4) of the Exchange Act.

      Andrew H. Meyers  expects to evaluate and review  Langer and its business,
assets, corporate structure,  capitalization,  operations, properties, policies,
management  and  personnel  with a view  towards  determining  how to  optimally
realize  any  potential  benefits  which  arise from the  operations  of Langer.
Accordingly,  OrthoStrategies  reserves the right to change Langer's business by
reorganizing its operations, structure and personnel. OrthoStrategies intends to
seek  to  expand  Langer's   business   through   internal  growth  and  through
acquisitions  or  by  establishing  relationships  with  other  companies  whose
operations  relate to the manufacture or distribution of orthotic and prosthetic
devices. Andrew H. Meyers has reviewed the operations of various participants in
the musculoskeletal  prosthetic and orthotic industry and engaged in preliminary
background  conversations  with certain  members of the industry.  At this time,
however,  OrthoStrategies does not have an established  timetable,  has not made
any acquisition  proposal to any entity other than Langer, and is not a party to
any  acquisition,  merger or similar  agreement,  other  than the  Tender  Offer
Agreement, nor is it involved in negotiations in respect of any such agreements.

      Depending  upon the  opportunities  available,  OrthoStrategies  may cause
Langer to seek  additional  debt or equity  financing,  including  the financing
which would be provided by the  exercise of the OS Options (as defined  below in
this  Section  11) to be issued by  Langer to  OrthoStrategies.  There can be no
assurance,  however,  that any such financing  will be available to Langer,  and
none of OrthoStrategies,  Andrew Meyers, Greg Nelson or Kanders & Company,  Inc.
or their assignees,  if any, will be required to exercise any of the OS Options.
If Langer  finances its  activities  through the issuance of equity  securities,
such issuance will result in dilution to the interests of Langer's shareholders.
To the extent  Langer incurs debt or issues debt  securities in connection  with
its expansion activities,  Langer will be subject to the obligations  associated
with such  indebtedness  and there can be no assurance  that  Langer's cash flow
will be sufficient to repay such indebtedness.


                                       13
<PAGE>

      Langer's  present working capital line with American  National Bank, under
which Langer has borrowed  approximately  $90,000, will expire on the earlier to
occur of the closing of the Offer or February  28, 2001.  While  OrthoStrategies
has  obtained a written  indication  of interest  from another bank to provide a
replacement  facility to Langer upon closing of the Offer, there is no assurance
that any such facility will be obtained by Langer.

      Although  none of  OrthoStrategies,  Kanders &  Company,  Inc.,  Andrew H.
Meyers and Greg  Meyers has any present  intention  to acquire any Shares in the
open  market,  other than the Shares to be acquired  pursuant to the Offer,  and
none of such  individuals or entity has any present  intention to dispose of any
Shares so acquired  (other than as discussed  in Section  12),  OrthoStrategies,
Kanders & Company, Inc., Andrew H. Meyers and Greg Meyers may acquire additional
Shares  following  the  consummation  of the  Offer  (including  those  issuable
pursuant  to the OS  Options),  or  dispose  of Shares  on the  over-the-counter
market, in privately negotiated transactions or otherwise. Any such transactions
may be  effected  at any time and from  time to time,  and may be made upon such
terms and at such prices as OrthoStrategies  shall determine,  which may be more
or less than the price paid in the Offer.

      General  Information  about the Agreements.  The following is a summary of
certain provisions of the Tender Offer Agreement, the Shareholders Agreement (as
defined  below) and certain other  agreements  which were executed and delivered
concurrently   with  the  Tender  Offer   Agreement  or  which   OrthoStrategies
anticipates  will be executed and  delivered by Langer  immediately  prior to or
concurrently   with  the   consummation   of  the   Offer   (collectively,   the
"Agreements").  This summary of such Agreements is not a complete description of
the terms and  conditions  of any of such  Agreements  and is  qualified  in its
entirety by reference to the full text of such  Agreements  which are filed with
the SEC as  exhibits  to the Tender  Offer  Statement  on  Schedule  TO filed by
OrthoStrategies  (the  "Schedule  TO") and are  hereby  incorporated  herein  by
reference.  Capitalized  terms not otherwise  defined below have the  respective
meanings assigned to them in the particular  Agreement  indicated below. Each of
the Agreements  discussed  below may be examined,  and copies  obtained,  as set
forth in Section 8 of this Offer to Purchase.

The Tender Offer Agreement

      The Offer. The Tender Offer Agreement provides that  OrthoStrategies  will
commence the Offer and that upon the terms and subject to prior  satisfaction or
waiver (to the extent  permitted to be waived) of the  conditions  of the Offer,
promptly after expiration of the Offer, OrthoStrategies will accept for payment,
and pay for up to 1,959,886 Shares validly  tendered and not withdrawn  pursuant
to the Offer.  The price shall be $1.525 per Share,  net cash to the seller.  If
more  than   1,959,886   Shares  are  validly   tendered   and  not   withdrawn,
OrthoStrategies  will accept for purchase  promptly after the Expiration Date an
amount of the tendered  Shares equal to  1,959,886  Shares,  on a pro rata basis
from each shareholder who has validly tendered Shares pursuant to the Offer. The
Tender Offer Agreement provides that  OrthoStrategies has the right, in its sole
discretion,  to modify and make certain  changes to the terms and  conditions of
the Offer,  except that  unless  previously  approved  by Langer in writing,  no
provision  may be set  forth or  changed  which:  decreases  the price per Share
payable in the Offer, changes the form of consideration  payable in the Offer or
imposes  conditions  to the Offer in  addition  to those set forth in the Tender
Offer  Agreement  that are  materially  adverse to the  holders  of the  Shares.
Without the prior written consent of Langer,  OrthoStrategies  cannot extend the
expiration date of the Offer beyond March 31, 2001; further, once the conditions
to the Offer have been  satisfied,  OrthoStrategies  cannot extend the Offer for
more than five business days without the consent of Langer.

      Termination of the Tender Offer Agreement.  The Tender Offer Agreement may
be terminated at any time before  OrthoStrategies  has purchased Shares pursuant
to the Offer:

      (1) by mutual written  consent duly  authorized by the boards of directors
of OrthoStrategies and Langer;

      (2) by either  OrthoStrategies  or Langer if there shall be any applicable
domestic law, rule or regulation that makes consummation of the Offer illegal or
otherwise prohibited or if any judgment,  injunction, order or decree of a court
of competent  jurisdiction  shall restrain or prohibit the  consummation  of the
Offer,  and such  judgment,  injunction,  order or decree shall become final and
nonappealable;

      (3) by action of the board of directors of OrthoStrategies if:

      o     Langer has failed to comply in any material  respect with any of its
            covenants or agreements contained in the Tender Offer Agreement, and
            such failure has not been cured prior to the earlier of:


                                       14
<PAGE>

            o     five (5) business days  following the giving of written notice
                  to Langer of such failure; or

            o     the  business  day  prior to the date on  which  the  Offer is
                  scheduled to expire;

      o     the board of  directors  of Langer  amends or  modifies  in a manner
            adverse to  OrthoStrategies  its approval or  recommendation  of the
            Offer,  withdraws  such  recommendation  or shall have  approved  or
            recommended  any other Company  Acquisition  Proposal (as defined in
            the Tender Offer Agreement  which  definition is set forth under the
            heading "Acquisition  Proposals" below) or shall have resolved to do
            any of the foregoing; or

      o     the  shareholders of Langer shall have tendered fewer than 1,332,722
            Shares  or the  shareholders  which  are  party to the  Shareholders
            Agreement  shall have tendered in the aggregate fewer than 1,305,606
            of their Shares in accordance with the Shareholders Agreement;

provided,   in  each  case,   that  the   representations   and   warranties  of
OrthoStrategies  contained in the Tender Offer  Agreement are, as of the date of
termination  by  OrthoStrategies,  correct  in all  respects,  except  for  such
exceptions which would not have a material adverse effect on OrthoStrategies.

      (4) by action of the board of directors of Langer if:

      o     OrthoStrategies  fails to comply in any material respect with any of
            its covenants or agreements contained in the Tender Offer Agreement,
            and such failure is not cured prior to the earlier of:

            o     five (5) business days  following the giving of written notice
                  to OrthoStrategies of such failure; or

            o     the  business day prior to the date on which the Offer is then
                  scheduled to expire; or

      o     OrthoStrategies fails to commence the Offer within the time required
            in the Tender Offer Agreement;

provided,  in each  case  that the  representations  and  warranties  of  Langer
contained  in the Tender  Offer  Agreement  are, as of the date of  termination,
correct in all  respects,  except  for such  exceptions  which  would not have a
material adverse effect on Langer.

      (5) By the board of directors of Langer if:

            o     the board of directors of Langer receives or there is publicly
                  announced a bona fide  written  Company  Acquisition  Proposal
                  (which Company  Acquisition  Proposal was  unsolicited and did
                  not otherwise result from a breach by Langer or certain of its
                  affiliates of the non-solicitation provisions contained in the
                  Tender Offer  Agreement)  and the board of directors of Langer
                  determines  in good  faith (i) that such  Company  Acquisition
                  Proposal is reasonably likely, if consummated,  to result in a
                  transaction  more  favorable to Langer's  shareholders  from a
                  financial point of view than the  transaction  contemplated by
                  the Tender Offer  Agreement (a "Superior  Proposal")  and (ii)
                  after  consultation  with  outside  counsel,   that  approval,
                  acceptance  or  recommendation  of  such  Company  Acquisition
                  Proposal or tender or exchange offer is necessary in order for
                  its  directors  to  comply  with  their  respective  fiduciary
                  duties, and Langer shall substantially  concurrently with such
                  termination enter into a definitive  agreement  containing the
                  terms of a Superior Proposal;  provided,  however, that Langer
                  shall not exercise its right to terminate this Agreement until
                  after  three (3) days  following  OrthoStrategies'  receipt of
                  written notice advising OrthoStrategies that Langer's board of
                  directors  has received a Superior  Proposal (or that a tender
                  or  exchange  offer  with  respect  to  the  Shares  has  been
                  commenced) and that Langer's board of directors will,  subject
                  to any action taken by OrthoStrategies, cause Langer to accept
                  such Superior  Proposal (or recommend  such tender or exchange
                  offer);

      (6) by either  OrthoStrategies  or Langer if the Offer shall not have been
consummated  by March 31,  2001,  other  than as a result of the  failure of the
party seeking  termination to comply with its obligations under the Tender Offer
Agreement.

      Effect of  Termination.  If the  Tender  Offer  Agreement  is  terminated,
neither  OrthoStrategies  nor Langer (nor any of their  respective  directors or
officers)  will have any  liability  or further  obligation  to the other party,
except as  specifically  provided in the Tender Offer  Agreement with respect to
the payment of fees and  expenses,  and except that each will remain  liable for
any breach of the Tender Offer Agreement.


                                       15
<PAGE>

      Fees  and  Expenses.  Each of  Langer  and  OrthoStrategies  will  pay its
respective expenses in connection with the Tender Offer Agreement, except that:

      (1) If the Tender Offer  Agreement is  terminated by Langer as a result of
the  failure  of  OrthoStrategies  to comply in any  material  respect  with its
covenants or  agreements  contained in the Tender Offer  Agreement and to timely
cure a breach of such covenants or agreements  after the notice  thereof,  or if
OrthoStrategies shall terminate the Tender Offer Agreement when it does not have
the right to do so,  OrthoStrategies  shall reimburse  Langer for its reasonable
out-of-pocket  expenses  actually incurred in connection with the Offer, up to a
maximum of $150,000.  Andrew H. Meyers has personally  guaranteed the payment by
OrthoStrategies of Langer's  out-of-pocket  expenses,  up to a maximum amount of
$150,000 ("Meyers Expense Guaranty") if Langer should terminate the Tender Offer
Agreement as described in this clause 1.

      (2) If the Tender  Offer  Agreement  is  terminated  by Langer in order to
accept and enter into an agreement  relating to a Superior  Proposal,  or if the
Tender  Offer  Agreement  is  terminated  by  OrthoStrategies  as a result of an
amendment  or   modification  by  the  board  of  directors  of  Langer  of  its
recommendation of the Offer in a manner adverse to  OrthoStrategies,  withdrawal
by the board of directors of Langer of its recommendation or the approval by the
board of  directors  of Langer of another  Company  Acquisition  Proposal,  or a
determination  by the board of directors  of Langer to do any of the  foregoing,
Langer will reimburse OrthoStrategies for its reasonable out-of-pocket costs and
expenses  incurred  in  connection  with  the  Tender  Offer  Agreement  and the
transactions contemplated thereby.

      (3) If the Tender Offer Agreement is terminated by OrthoStrategies  (i) as
a result of the  failure of Langer to comply in any  material  respect  with its
covenants or  agreements  contained in the Tender Offer  Agreement and to timely
cure such breach after notice  thereof,  or if Langer shall terminate the Tender
Offer  Agreement  when it does not have the right to do so, or (ii)  because the
shareholders  of Langer shall have tendered fewer than  1,332,722  Shares or the
shareholders  which are party to the Shareholders  Agreement shall have tendered
in the aggregate  fewer than  1,305,606 of their Shares in  accordance  with the
Shareholders Agreement, Langer will reimburse OrthoStrategies for its reasonable
out-of-pocket  costs and expenses  incurred in connection  with the Tender Offer
Agreement  and the  transactions  contemplated  thereby  subject to a maximum of
$325,000,  of which the first $250,000 would be paid in cash and the excess over
$250,000 paid in Shares valued at $1.525 per Share.

      Acquisition Proposals.  Neither Langer nor any of its subsidiaries nor any
of the respective  officers,  directors,  employees or other agents of Langer or
its subsidiaries nor any other related party will:

      o     take any action to  solicit,  initiate  or  encourage,  directly  or
            indirectly, any offer or proposal for, or any indication of interest
            in,  or the  making of any  proposal  or offer  (including,  without
            limitation,  any proposal or offer to  shareholders  of Langer) with
            respect to a merger, consolidation, reorganization, recapitalization
            or other business  combination  involving Langer or its subsidiaries
            or the  acquisition  of an  equity  interest  in,  or a  substantial
            portion  of the assets of,  Langer or any of its  subsidiaries  (any
            such proposal or offer being  referred to as a "Company  Acquisition
            Proposal"); or

      o     unless otherwise required in accordance with the fiduciary duties of
            the board of directors of Langer under  applicable law as advised by
            counsel to Langer,  engage in discussions or  negotiations  with, or
            disclose any nonpublic  information relating to Langer or any of its
            subsidiaries or afford access to the properties, books or records of
            Langer  or any of  its  subsidiaries,  to  any  person  that  may be
            considering making, or has made, a Company Acquisition Proposal.

      Langer will promptly notify  OrthoStrategies  after receipt of any Company
Acquisition  Proposal  or any  request  for  nonpublic  information  relating to
OrthoStrategies  or any of its  subsidiaries  or for  access to the  properties,
books or records of Langer or any of its  subsidiaries by any person that may be
considering making, or has made, a Company Acquisition Proposal.

      Covenants.  The Tender Offer  Agreement  contains  certain  covenants  and
restrictions  as to the conduct of business by Langer  pending the completion of
the Offer,  including covenants requiring Langer to conduct its business only in
the ordinary course;  restricting Langer's ability, among other matters, to take
actions that would  change or affect the capital  structure of Langer or involve
the issuance or redemption of securities,  and limiting Langer's ability to sell
assets, make capital expenditures,  engage in acquisitions,  incur indebtedness,
enter into  employment or severance  agreements,  enter into or modify  material
contracts, amend benefit plans or settle claims.


                                       16
<PAGE>

      Certain  Agreements  with Langer  Management.  The Tender Offer  Agreement
further  obligates  Langer to redeem from the holders  thereof  certain  options
currently outstanding to purchase 225,000 Shares. These options are held by four
shareholders  who are parties to the Shareholders  Agreement  (Stephen V. Ardia,
Thomas I. Altholz and Kenneth Granat, each a Director of the Company, and Daniel
J. Gorney,  President  and CEO of the  Company).  The  redemption  price for the
options  is, in each  case,  equal to the  excess  of $1.525  over the per Share
exercise  price of the  options.  The  aggregate  amount to be paid by Langer to
redeem these 225,000 options, assuming a tender offer price of $1.525 per Share,
is $70,635.

      The  Tender  Offer  Agreement  permits  Langer to pay up to $25,000 in the
aggregate  to its  Directors  for  services  rendered in their  active  roles in
connection  with  the  negotiation  of the  transactions  contemplated  by  this
Agreement,  all of  which  was  paid  prior  to the  date  of the  Tender  Offer
Agreement.

      As an incentive to those members of Langer  executive  management  who are
not Directors  (Daniel J. Gorney,  President and CEO; Thomas G. Archbold,  Chief
Financial Officer; and Ronald Spinelli,  Vice President of Operations) to remain
in the employ of Langer  through  the  Closing of the Offer and to assist in the
transition period following the Closing:

      o     Langer  will  provide   bonuses  to  such   executives   if  certain
            performance  targets are met at the month end  preceding the Closing
            of the  Offer.  Such bonus  will be up to  $20,000  for Mr.  Gorney,
            $20,000 for Mr. Archbold and $25,000 for Mr. Spinelli,  with minimum
            guaranteed bonuses to Messrs.  Archbold and Spinelli of $5,000 each.
            To receive such bonus, such individuals must remain in the employ of
            Langer for 90 days following the Closing of the Offer.

      o     Langer will provide three months base salary as a severance  payment
            to Messrs.  Archbold  and  Spinelli if they are  terminated  without
            cause within six months of the Closing of the Offer. The Company has
            committed  to  continue  to employ Mr.  Gorney,  and Mr.  Gorney has
            committed  to remain  employed  with the  Company,  for three months
            after the  Closing  of the  Offer;  thereafter  Mr.  Gorney  will be
            entitled to receive three months base salary as a severance payment.

      Representations  and  Warranties.  The  Tender  Offer  Agreement  contains
representations  and warranties by each of Langer and  OrthoStrategies  that are
customary for a transaction of this kind. These  representations  and warranties
are deemed to be made as of the date of the Tender Offer Agreement and as of the
date of the closing of the Offer.  OrthoStrategies is not obligated to close the
Offer and purchase Shares if (1) any  representation or warranty of Langer shall
have been inaccurate or incomplete as of the date of the Tender Offer Agreement,
except for such  exceptions  which  individually  or in the aggregate  would not
constitute  a material  breach of any  representation  or  warranty,  or (2) any
representation or warranty of Langer shall be inaccurate or incomplete as of the
Closing Date, except for such exceptions which  individually or in the aggregate
would not have a material adverse effect on the financial  condition,  business,
or results of  operations  of Langer  and its  subsidiaries  taken as a whole (a
"Company Material Adverse Effect").

      Amendment of the Tender Offer Agreement. At any time prior to the purchase
of the Shares pursuant to the Offer,  Langer and  OrthoStrategies  may modify or
amend the Tender Offer Agreement by written agreement  executed and delivered by
duly authorized officers of the respective parties.

      Directors'  and  Officers'  Insurance.  In  the  Tender  Offer  Agreement,
OrthoStrategies,  Purchaser  and Langer agreed that after the purchase of Shares
pursuant  to  the  Offer,  Langer  will  maintain  its  existing  officers'  and
directors'  liability  insurance ("D&O  Insurance") for a period of three years;
provided,  however,  that (x) Langer may substitute therefor policies (which may
be "tail" policies) containing terms with respect to coverage and amount no less
favorable in any material respect to the directors and officers,  and (y) if the
existing  D&O  Insurance  expires,   is  terminated  or  cancelled  during  such
three-year  period,  Langer will use  commercially  reasonable  best  efforts to
obtain similar D&O Insurance for the remainder of such three-year period.

      Appraisal Rights.  Holders of the Shares do not have appraisal rights as a
result of the Offer pursuant to the New York Business Corporation Law.

      The OS Options.  The Tender Offer Agreement  requires that Langer grant to
OrthoStrategies options to purchase 1,400,000 Shares (the "OS Options").  The OS
Options  will be  exercisable  for a  period  of 180 days  commencing  as of the
closing date of the Offer.  The exercise price of the OS Options  initially will
be $1.525 per


                                       17
<PAGE>

Share;  shall increase to $1.550 per Share  ninety-one days after the Closing of
the Offer;  shall increase to $1.575 per Share one hundred twenty one days after
the  Closing of the Offer;  and shall  increase  to $1.60 per Share one  hundred
fifty one days after the  Closing of the  Offer.  The number of Shares  issuable
upon  exercise of the OS Options and the exercise  price thereof will be subject
to adjustment from time to time in the event of (i) any dividend or distribution
or the Shares  (including any distribution of other or additional stock or other
securities   or  options  by  way  of  dividend,   spin-off,   reclassification,
recapitalization  or similar  corporate  arrangement);  (ii) any  dividend on or
subdivision  of  the  Shares;   or  (iii)  any  combination,   consolidation  or
reclassification of the Shares.

      In case of any  consolidation  or merger to which  Langer is a party,  the
sale of substantially  all the assets of Langer or a capital  reorganization  or
reclassification of the Shares or other securities issuable upon exercise of the
OS Options, proper provision shall be made so that upon exercise of an OS Option
the holder  shall be  entitled to receive the kind and amount of stock and other
securities and property  receivable upon such merger or  consolidation,  sale or
capital  reorganization or  reclassification by a holder of the number of Shares
or other  securities  issuable upon exercise of an Option  immediately  prior to
such   merger   or   consolidation,    sale   or   capital   reorganization   or
reclassification.

      The OS  Options  will be  transferable,  in whole or in part,  subject  to
applicable securities laws.  OrthoStrategies intends to assign the OS Options to
Andrew H. Meyers and Kanders & Company,  Inc., if they purchase  Shares pursuant
to  the  Offer  directly  rather  than  through  OrthoStrategies,  in  the  same
proportions as their relative commitment to fund the purchase of Shares tendered
in the Offer;  provided,  however, that in the event that fewer than the maximum
number of Shares are  tendered,  the  proportion of OS Options shall be adjusted
such that the number OS Options retained by OrthoStrategies and/or Andrew Meyers
shall relate to such number of shares which can be purchased for an amount equal
to (a) $1,500,000,  less (b) the amount actually paid by OrthoStrategies  and/or
Andrew Meyers for the purchase of Shares pursuant to the Tender Offer Agreement.

      There  can be no  assurance  that  the OS  Options  will be  exercised  by
OrthoStrategies or any assignee thereof. Langer may need additional financing to
achieve its growth  objectives and subject to approval of the then current board
of directors of Langer,  such  financing may be provided by  OrthoStrategies  or
other related parties upon other terms, including by the purchase of convertible
notes  or  preferred  stock of  Langer  or other  methods  and the sale  prices,
conversion  prices,  or the exercise  prices of such  securities may be lower or
higher  than the  exercise  price of the OS Options or the then  current  market
price of the Shares.

      In   connection   with  the  issuance  of  the  OS  Options,   Langer  and
OrthoStrategies  have  entered  into a  Registration  Rights  Agreement.  In the
Registration  Rights Agreement Langer granted to OrthoStrategies  certain demand
and  "piggy-back"  registration  rights  with  respect  to the  Shares  or other
securities  issuable upon exercise of the OS Options.  The  Registration  Rights
Agreement contains certain covenants customary for such agreements, including an
agreement by Langer to indemnify  OrthoStrategies  against  certain  liabilities
under the Securities Act in connection  with the  distribution  of the Shares or
other securities issuable upon exercise of the OS Options.

      The rights of OrthoStrategies  under the Registration Rights Agreement are
assignable  to any party  which might  acquire the OS Options or the  securities
issuable upon exercise thereof.  As noted above,  Andrew H. Meyers and Kanders &
Co. may acquire the OS Options directly and, therefor,  OrthoStrategies'  rights
under the Registration Rights Agreement.

The Shareholders Agreement

      On December 28 , 2000, OrthoStrategies,  Langer and Purchaser entered into
an agreement with Kenneth Granat,  Stephen V. Ardia,  Justin Wernick,  Thomas I.
Altholz,  Donald Cecil, Daniel J. Gorney, Trigran Investments,  L.P., The Granat
Family   Limited   Partnership   and  the  Kenneth   Granat  1990  Family  Trust
(individually,   a  "Shareholder,"  collectively,   the  "Shareholders").   This
agreement is referred to herein as the "Shareholders Agreement". Messrs. Granat,
Ardia,  Wernick and Altholz  comprise all of the current members of the Board of
Directors of Langer;  Mr. Gorney is the current  President  and Chief  Executive
Officer of the Company;  and such  partnerships  and trust are affiliates of Mr.
Granat.  Mr.  Cecil,  who is not a director or employee of Langer,  owns 248,553
Shares.


                                       18
<PAGE>

      The Shareholders Agreement obligates each Shareholder to tender his or its
Shares   (1,355,606  Shares  in  the  aggregate)  in  the  Offer  and  obligates
OrthoStrategies to purchase such Shares,  subject to the terms and conditions of
the  Offer,   at  a  price  of  $1.525  per  Share,  or  such  higher  price  as
OrthoStrategies  may  set in the  Offer.  The  Shareholders  Agreement  provides
further that if the Offer is not completed or is  terminated  due to the receipt
by Langer  of a  competing  offer at a price  above  $1.525  per  Share,  at the
election of OrthoStrategies on or prior to March 31, 2001, each Shareholder will
sell his or its  Shares  to  OrthoStrategies  at a price of  $1.525  per  Share.
Although the Shareholders  Agreement states that the shareholders  party thereto
own and  will  tender  1,355,606  Shares,  subsequent  to the  execution  of the
Shareholders  Agreement it was determined  that the  shareholders  party thereto
actually owned 1,342,273 Shares.

      In the aggregate,  the 1,342,273 Shares which the  Shareholders  Agreement
obligates the  Shareholders  to tender in the Offer or sell to  OrthoStrategies,
represent approximately 51.4% of Langer's outstanding Shares.

      Each  Shareholder  also agreed in the  Shareholders  Agreement that at any
shareholder meeting, or in any written consent in lieu thereof, such Shareholder
will vote his Shares  against  (i) any  amendment  of  Langer's  Certificate  of
Incorporation or by-laws, which would be reasonably likely to impede, frustrate,
prevent or nullify the Offer or any of the other  transactions  contemplated  by
the Tender  Offer  Agreement  or change in any  manner the voting  rights of any
class of Langer's  common  stock,  (ii) any action  that would  cause  Langer to
breach any  representation,  warranty or covenant  contained in the Tender Offer
Agreement  or (iii) any action to elect to Langer's  board of  directors  anyone
other  than  the  designees  of  OrthoStrategies  or  replacements  of  existing
directors,  which  replacement  directors  agree to resign on the closing of the
Offer.

      The Shareholders Agreement further obligates those Shareholders which hold
options to acquire  Shares to sell such  options  to Langer  effective  upon the
closing of the Offer or the  purchase of Shares by  OrthoStrategies  pursuant to
the Shareholders Agreement.  The aggregate number of such options to be redeemed
by Langer is 225,000 and the price to be paid therefor is equal to the excess of
$1.525 per share over the  respective  exercise  prices of such  options,  for a
total aggregate consideration of $70,635 to be paid by Langer.

Langer's Board of Directors

      The Tender Offer Agreement  provides that Langer will use its best efforts
to facilitate the election to the board of directors of Langer,  effective as of
the purchase of (i) a majority of the issued and  outstanding  Shares and,  (ii)
subject to the conditions of the Offer, all Shares tendered in the Offer, Andrew
H. Meyers and up to four additional individuals,  designated by OrthoStrategies,
currently  anticipated to be Greg Nelson,  Burtt R. Ehrlich,  Jonathan R. Foster
and Arthur  Goldstein.  Further,  Langer will use its best efforts to facilitate
the  resignation,  effective  as of the purchase of (i) a majority of the issued
and  outstanding  Shares and, (ii) subject to the  conditions of the Offer,  all
Shares tendered in the Offer,  of Kenneth Granat,  Thomas I. Altholz and Stephen
V. Ardia from the Langer board of directors.

      OrthoStrategies,  Purchaser  and Langer  entered  into an  agreement  with
Stephen V. Ardia,  Kenneth Granat,  Thomas I. Altholz and Justin Wernick whereby
each of these individuals,  acting in his individual capacity,  agreed to resign
from the board of directors of Langer,  effective  upon the purchase of at least
of  majority  of the  outstanding  Shares  in the  Offer or the  acquisition  by
Purchaser  or its  assignees,  pursuant to the  Shareholders  Agreement,  of the
outstanding  Shares  owned by such  individuals.  In  addition,  this  Agreement
provides  that upon  purchase  of the  Shares as  described  in the  immediately
preceding  sentence,  Langer, OS and Purchaser will cause Langer to maintain its
existing  directors'  and  officers'  liability  insurance for a period of three
years,  subject to Langer's  right to obtain  substitute  policies as more fully
discussed above.

      Burtt R.  Ehrlich,  61, has served as a director of Armor  Holdings  since
January 1996.  Mr.  Ehrlich  served as Chairman and Chief  Operating  Officer of
Ehrlich Bober Financial Corp.  (the  predecessor of Benson Eyecare  Corporation)
from  December  1986  until  October  1992 and as a director  of Benson  Eyecare
Corporation from October 1992 until November 1995.

      Arthur Goldstein, 69, is President of AGA Associates,  investment advisors
founded in 1986. Prior to that, Mr. Goldstein was a financial advisor at several
brokerage firms. His management  experience  includes  President of Butler Ind.,
Division  of  Safeguard  Ind.  (SFE,  NYSE),  and  Chairman  of  Rudor  Ind.,  a
multi-division  service


                                       19
<PAGE>

organization. He was also Chairman of Gerber Ind., designers of department store
interiors from 1980 to 1983. Mr.  Goldstein  received his BS in Management  from
Rensselaer  Polytechnic  Institute.  He was also a trustee  of New York  Medical
College and a member of the Young Presidents Organization (YPO).

      Jonathan R.  Foster,  43,  joined  Howard  Capital  Management  in 1994 as
President.  In  addition  to  overseeing  the firm's  operations  and  strategic
development, he manages the portfolios of numerous individuals and families. Mr.
Foster also is responsible for managing Howard Capital  Management's  West Coast
operations. With two decades of experience in finance and wealth management, Mr.
Foster  previously was managing  general partner of Jonathan Foster & Co., LP, a
private  investment  boutique  he  founded  in 1987.  Prior  to that,  he was an
associate  director of Bear,  Stearns & Co., LP. Mr.  Foster's  earlier  finance
experience  includes  positions at Edelman Group and Oppenheimer & Company.  Mr.
Foster  is a  director  of Troma  Entertainment,  Inc.  and the  Jeffrey  Modell
Foundation. He received his B.A. degree in Political Science from the University
of Pennsylvania.

      Though the compensation to be paid to the new non-management directors has
not yet been determined,  the "Best Efforts Agreement" (See "Certain  Additional
Agreements")  contemplates  that each of the  non-management  directors  will be
issued  options for their services and that Burtt R. Ehrlich will also receive a
cash stipend for serving as Chairman of Langer.

      Employment  Agreement with Andrew H. Meyers.  Pursuant to the Tender Offer
Agreement, Langer employed Andrew H. Meyers to serve in an advisory capacity and
as an  observer  to the  board of  directors  of  Langer  on an  interim  basis.
Effective  the  closing of the Offer,  it is  anticipated  that the new board of
directors of Langer designated by OrthoStrategies  will approve, and Langer will
enter into, an Executive  Employment Agreement with Mr. Meyers, (the "Employment
Agreement"),  pursuant to which Mr. Meyers will be elected a director, President
and Chief Executive  Officer of Langer for an initial term expiring December 31,
2003. Mr. Meyers' Employment Agreement will provide for a base salary of no less
than $175,000 per annum.  The  Agreement  also provides that Mr. Meyers shall be
eligible to receive in respect of each calendar  year a performance  based bonus
in accordance with a bonus plan to be approved by the Compensation  Committee of
Langer's  board of  directors.  In  addition,  Mr.  Meyers  will be  entitled to
participate in any pension plan,  health and accident plan or any other employee
benefit plan or arrangement offered to Langer's employees and senior executives.
Upon  execution  of the  Tender  Offer  Agreement  and the  commencement  of his
employment  with Langer,  Mr.  Meyers was granted an option to purchase  175,000
Shares  pursuant to  Langer's  1992 Stock  Option  Plan at an exercise  price of
$1.525 per Share.  Mr.  Meyers'  options  vest in three  equal  installments  on
December 31, 2001,  2002 and 2003,  if he is employed with Langer on such dates,
and,  subject to the terms of the Option  Agreement,  are exercisable  until the
tenth anniversary of the date on which the Tender Offer Agreement was executed.

      Consulting  Agreement  with  Kanders  &  Company,   Inc.   OrthoStrategies
contemplates  that upon consummation of the Offer, the new board of directors of
Langer designated by OrthoStrategies will approve, and Langer will enter into, a
Consulting Agreement with Kanders & Company, Inc. (the "Consulting  Agreement").
The Consulting  Agreement provides that during its term Kanders & Company,  Inc.
will act as a  non-exclusive  consultant to Langer and will provide  Langer with
general investment banking and financial advisory services, including assistance
in the development of a corporate financing and acquisition strategy.

      The Consulting  Agreement will provide for an initial term of three years.
Pursuant to the Agreement,  Kanders & Company,  Inc. is to receive an annual fee
of $100,000,  options to purchase  100,000 Shares of Langer at a price of $1.525
per Share and reimbursement for out-of-pocket expenses. The Consulting Agreement
will also obligate Langer to indemnify Kanders & Company,  Inc.,  pursuant to an
Indemnification  Agreement  to be entered  into  between  Langer  and  Kanders &
Company, Inc., against any loss or expense, including all interest,  assessments
and other  charges  paid or  payable  in  connection  with any loss or  expense,
Kanders & Company,  Inc.  might incur as a result of any claim  brought  against
Langer or Kanders & Company,  Inc. arising out of or related to the relationship
between Kanders & Company,  Inc. and Langer, or activities undertaken by Kanders
& Company, Inc. at the request of Langer. In addition,  the Consulting Agreement
contemplates  that Langer and the Company  will  execute  additional  engagement
letters in  connection  with  specific  transactions  in which the  services  of
Kanders &  Company,  Inc.  will be relied  upon by  Langer  for which  Kanders &
Company, Inc. will receive additional compensation.


                                       20
<PAGE>

      As  an  inducement  to  the  execution  and  delivery  of  the  Consulting
Agreement,  Kanders &  Company,  Inc.  will agree  that,  during the term of the
Consulting  Agreement  and for a  period  of one  year  thereafter,  it will not
solicit or engage in any  business  competitive  with the business of Langer or,
subject  to  certain  limitations,  invest in or give  financial  support to any
business competitive with that of Langer.

      The 100,000 options (the "Consultant's Options") to be issued to Kanders &
Company,  Inc.  pursuant to the  Consulting  Agreement are to be evidenced by an
Option Agreement (the "Consultant's Option Agreement") to be entered into on the
Closing  of the Offer.  The  Consultant's  Option  Agreement  provides  that the
Consultant's Options will vest in three equal installments on December 31, 2001,
2002 and 2003,  provided that if Warren  Kanders,  the principal  shareholder of
Kanders & Company,  Inc.,  shall die or be disabled  prior to December 31, 2003,
there shall be deemed  vested a pro-rata  portion of the Shares which would have
vested as of the end of the year  during  which he dies,  based on the number of
days  elapsed  during such year prior to his death.  The  Consultant's  Options,
subject to vesting,  will be exercisable  for ten years at a price of $1.525 per
Share. The number of Shares issuable upon exercise of the  Consultant's  Options
and the exercise  price  thereof are subject to  adjustment  on terms similar to
those contained in the Option Agreement  evidencing the OS Options,  except that
the  Consultant's  Option Agreement also provides for an adjustment in the event
Langer shall issue or sell any Shares in exchange for consideration in an amount
per Share less than the exercise price of the  Consultant's  Options at the time
of such issuance or sale.

      In connection with the issuance of the Consultant's  Options,  Langer will
grant to Kanders & Company,  Inc.  certain  compulsory,  demand and "piggy-back"
registration rights with respect to the securities issuable upon exercise of the
Consultant's  Options.  The Consultant's  Registration Rights Agreement contains
certain  covenants and agreements  customary for such  agreements,  including an
agreement  by  Langer  to  indemnify  Kanders  &  Company,   Inc.  from  certain
liabilities  under the Securities Act in connection with the registration of the
securities underlying the Consultant's Options.

Certain Additional Agreements

      Andrew Meyers has executed an agreement ("Lockup  Agreement")  pursuant to
which he has  agreed  that he will  not,  for a period of three  years,  sell or
otherwise  hypothecate or dispose of any of the shares acquired by him unless he
has received the permission of the Company's Board of Directors and of Kanders &
Company, Inc.  Notwithstanding the forgoing, if Kanders & Company, Inc. disposes
of any of its Shares  during such three year  period,  Mr.  Meyers will have the
right  for a  limited  time to sell a  percentage  of his  Shares  equal  to the
percentage  of  Kanders &  Company,  Inc.'s  shares  which are sold by Kanders &
Company, Inc.

      In  consideration  of the  execution  by Kanders & Company,  Inc. and Greg
Nelson of the  Commitment  Letter,  OrthoStrategies  and Andrew Meyers  ("Meyers
Parties") entered into a letter agreement with Kanders & Company,  Inc. and Greg
Nelson  ("Best  Efforts  Agreement")  pursuant  to which (i) the Meyers  Parties
agreed to use their collective best efforts immediately upon the consummation of
the  purchase  of the  Shares  in  his/its  capacity  as a  direct  or  indirect
shareholder  of  Langer,  to take  all  necessary  actions,  and to use  his/its
respective best efforts to cause Langer to execute the Consulting Agreement with
Kanders & Company, Inc., to issue the Consultant's Options to Kanders & Company,
Inc.,  to  execute a related  Indemnification  Agreement  in favor of  Kanders &
Company,  Inc., to execute the  Registration  Rights  Agreement  relating to the
Consultant's Options, to issue to each of the non-management directors of Langer
options to purchase up to 30,000  shares of Langer  common  stock at an exercise
price of $1.525 per share,  and, in addition (i) to cause Burtt R. Ehrlich to be
elected a director  and  non-executive  Chairman of Langer and to be paid annual
compensation of $10,000 and (ii) to cause Greg Nelson, Arthur Goldstein,  Andrew
Meyers, and Jonathan Foster to be elected as directors of Langer.

      The Best  Efforts  Agreement  also  provides  that,  in  order  to  induce
OrthoStrategies to enter into the Tender Offer Agreement and to proceed with the
purchase of the Shares and to induce Andrew Meyers to enter into the  Commitment
Letter,  each of  Kanders & Co. and Greg  Nelson  agrees,  immediately  upon the
consummation  of the  purchase of the Shares in his/its  capacity as a direct or
indirect  shareholder  of  Langer,  to take all  necessary  actions,  and to use
his/its  respective best efforts to cause Langer to take all necessary  actions,
in order that Langer shall execute and deliver the Employment  Agreement between
Langer and  Andrew  Meyers,  pursuant  to which  Andrew  Meyers  shall  serve as
President and Chief Executive Officer of Langer for a three year term.


                                       21
<PAGE>

      The Best Efforts  Agreement further provides that all parties will jointly
exert their best efforts,  immediately  upon the consummation of the purchase of
the Shares in their respective  capacities as direct or indirect shareholders of
Langer, to take all necessary actions,  and to use their respective best efforts
to cause  Langer to take all  necessary  actions,  in order  that  Langer  shall
execute and  deliver  separate  indemnification  agreements  between  Langer and
Meyers in a form acceptable to Meyers and between Langer and Greg Nelson, Arthur
Goldstein,  Burtt R. Ehrlich and Jonathon  Foster  pursuant to which Langer will
indemnify such persons to the fullest extent  authorized by law, against any and
all losses and expenses  (including all interest,  assessments and other charges
paid or payable in connection therewith) incurred in connection with the service
of such persons as an officer and/or director of Langer and its subsidiaries and
affiliates.

      The parties to the Best  Efforts  Agreement  have  further  agreed that if
OrthoStrategies  is unable to close under the Tender Offer Agreement because any
party  fails to fund his or its  commitment  under the  Commitment  Letter,  the
non-funding   party   shall  be   responsible   for  all  of  the   expenses  of
OrthoStrategies  and Kanders & Company,  Inc.  incurred in  connection  with the
Offer and any amount  required to be paid by Mr.  Meyers  pursuant to the Meyers
Expense Guaranty described above.  However,  if in the reasonable opinion of any
of such  parties,  OrthoStrategies  has the right to terminate  the Tender Offer
Agreement  pursuant to the terms and  conditions of the Tender Offer  Agreement,
any of the parties,  on behalf of itself and any of its designees  (collectively
"Withdrawing  Party") may, without liability or further  obligation,  decline to
provide  funds for the  purchase of the Shares and  decline to  purchase  Shares
("Withdrawal"); provided, however, that

      (a) if OrthoStrategies thereafter declines to close under the Tender Offer
Agreement,  each of the parties  shall have a  continuing  obligation  to fund a
portion of OrthoStrategies'  and Kanders & Co.'s Expenses in the same proportion
as required under the Commitment Letter; and

      (b) if OrthoStrategies nevertheless proceeds to a Closing under the Tender
Offer Agreement despite a party's Withdrawal, and the Withdrawing Party does not
in fact purchase Shares, such Withdrawing Party shall not have any obligation to
contribute to the fees and expenses which would otherwise be required to be paid
by such Withdrawing Party pursuant to the Commitment Letter.

12. Source and Amount of Funds

      OrthoStrategies  estimates  that the  total  amount of funds  required  to
purchase  1,959,886  Shares  pursuant to the Offer and to pay  related  fees and
expenses will be approximately $3.5 million.  OrthoStrategies has entered into a
Commitment  Letter with Andrew Meyers,  Greg Nelson and Kanders & Company,  Inc.
wherein  they each agree to provide  OrthoStrategies  on a timely basis with the
funds necessary to purchase the Shares tendered and to pay all fees and expenses
required to be paid by OrthoStrategies in connection with the Offer.

      If the maximum number of Shares  (1,959,886)  are tendered,  the necessary
funds to pay the purchase  price of the Shares will be provided,  $1,000,000  by
Andrew H. Meyers,  $300,000 by Greg  Nelson,  and the balance of  $1,688,860  by
Kanders &  Company,  Inc.  In the  event  that a  smaller  number of Shares  are
tendered, they will provide funds to pay the purchase price in the same ratio.

      The Tender Offer Agreement provides that OrthoStrategies has the right, at
the closing, to assign the right to purchase the Shares, in whole or in part, to
another entity  controlled by  OrthoStrategies  or to Andrew H. Meyers,  Gregory
Nelson or Kanders & Company, Inc., or the designees thereof. Any such assignment
will not  relieve  OrthoStrategies  of its  obligations  under the Tender  Offer
Agreement.  Kanders &  Company,  Inc.  has the right to assign a portion  of the
Shares  allocated for acquisition by it; provided that no such assignment  shall
relieve it of the  obligation  to fund the entire  purchase  price of the Shares
allocated for purchase by Kanders & Company, Inc.

13. Certain Conditions of the Offer

      Notwithstanding  any other provision of the Offer,  OrthoStrategies is not
required  to accept for  payment  or pay for,  or may delay the  acceptance  for
payment of or payment for, any tendered Shares,  or may, in its sole discretion,
terminate  or amend the Offer as to any  Shares  not then paid for if fewer than
1,332,722 Shares (equivalent to 51% of the outstanding  Shares) are properly and
validly tendered pursuant to the Offer and not withdrawn prior to the expiration
of the Offer (the "Minimum  Condition"),  or any necessary or required  consent,
registration,  approval,


                                       22
<PAGE>

permit or authorization of any governmental entity applicable to the Offer shall
not have been  obtained or, if on or after  December 29, 2000,  and at or before
the time of payment  for any of such  Shares  (whether  or not any  Shares  have
theretofore been accepted for payment), any of the following events occurs:

      a. Langer breaches or fails to perform in any material  respect any of its
      obligations, covenants or agreements under the Tender Offer Agreement; any
      representation  or  warranty  of  Langer  set  forth in the  Tender  Offer
      Agreement was  inaccurate or incomplete in any material  respect when made
      or  thereafter  becomes  inaccurate  or  incomplete  as of the date of the
      Tender Offer Agreement, except for such exceptions,  which individually or
      in  the  aggregate,   would  not  constitute  a  material  breach  of  any
      representation  or warranty  contained in the Tender Offer Agreement as of
      the date thereof; or any representation or warranty of Langer set forth in
      the Tender Offer  Agreement  shall be  inaccurate  or incomplete as of the
      Closing  Date,  except for such  exceptions  as of the Closing Date which,
      individually or in the aggregate,  would not constitute a Company Material
      Adverse Effect, as defined in the Tender Offer Agreement;

      b. there is  instituted  or pending  any action,  litigation,  proceeding,
      investigation or other application (an "Action") before any court or other
      governmental  authority by any  governmental  authority or  instituted  or
      pending  any  action  by  any  other  person,  domestic  or  foreign:  (i)
      challenging the acquisition by Purchaser of Shares, seeking to restrain or
      prohibit the consummation of the transactions contemplated by the Offer or
      seeking to obtain any material damages in connection with the transactions
      contemplated  by the  Offer;  (ii)  seeking  to  prohibit,  or impose  any
      material limitations on, Purchaser's  ownership or operation of all or any
      portion of it or Langer's  business or assets  (including  the business or
      assets of their  respective  affiliates  and  subsidiaries),  or to compel
      Purchaser  to dispose of or hold  separate all or any portion of Purchaser
      or Langer's  business or assets (including the business or assets of their
      respective  affiliates and  subsidiaries)  as a result of the transactions
      contemplated  by the  Offer;  (iii)  seeking  to make the  acceptance  for
      payment, purchase of, or payment for, some or all of the Shares illegal or
      render  Purchaser  unable  to, or result in a delay in, or  restrict,  the
      ability of Purchaser  to accept for  payment,  purchase or pay for some or
      all of the Shares;  (iv)  seeking to impose  material  limitations  on the
      ability of Purchaser  effectively  to acquire or hold or to exercise  full
      rights of ownership of the Shares including, without limitation, the right
      to vote the Shares purchased by it on an equal basis with all other Shares
      on all matters properly presented to the shareholders; or (v) that, in any
      event is reasonably likely to have a Company Material Adverse Effect;

      c.  any  statute,  rule,  regulation,  order  or  injunction  is  enacted,
      promulgated,  entered,  enforced or deemed applicable to the Offer, or any
      other action has been taken, proposed or threatened, by any court or other
      governmental  entity that could,  be expected to,  directly or indirectly,
      result in any of the effects of, or have any of the consequences sought to
      be obtained or achieved in, any action  referred to in clauses (i) through
      (v) of paragraph (b) above;

      d. any  person,  entity or group  shall  have  entered  into a  definitive
      agreement or an  agreement in principle  with respect to a tender offer or
      exchange  offer  for  some  portion  or  all of the  Shares  or a  merger,
      consolidation,  acquisition,  reorganization,  recapitalization  or  other
      business combination with or involving the Company;

      e. the board of directors of Langer (or a special  committee  thereof) has
      amended, modified or withdrawn its approval or recommendation of the Offer
      or the  Tender  Offer  Agreement  or  shall  have  endorsed,  approved  or
      recommended any other Company Acquisition  Proposal, or has resolved to do
      any of the foregoing;

      f. the Tender Offer  Agreement is terminated by Langer or  OrthoStrategies
      in accordance with its terms, or  OrthoStrategies  reaches an agreement or
      understanding   in  writing  with  Langer  providing  for  termination  or
      amendment of the Offer or delay in payment for the Shares;

      g. there shall have occurred (i) any general  suspension of, or limitation
      on prices for,  trading in securities on the NASDAQ  SmallCap Market for a
      period in excess of three hours  (other than a  suspension  or  limitation
      triggered by price  fluctuations and suspensions or limitations  resulting
      from  physical  damage  to or  interference  with the  systems  of  NASDAQ
      provided such  interference is not related to market  conditions),  (ii) a
      declaration of a banking moratorium in the United States or any suspension
      of payments in respect of banks in the United States, (iii) a commencement
      or  escalation  of a war,  armed  hostilities  or other  international  or
      national  calamity  resulting in a general  mobilization  of a substantial
      portion of the armed


                                       23
<PAGE>

      forces of the United States; (iv) the imposition by the Federal Reserve of
      a  limitation  on the  extension  of credit by  United  States  banks or a
      decline  of at least 30% in either  the Dow Jones  Average  of  Industrial
      Stocks or the  Standard  & Poor's  500 index  from the date of the  Tender
      Offer Agreement;

which, in the reasonable judgment of OrthoStrategies, in any such case, makes it
inadvisable to proceed with the Offer and/or with such acceptance for payment of
or payment for Shares.

      Further,  OrthoStrategies will have no obligation to accept for payment or
pay  for  any  tendered  shares,  unless,  as of the  closing  time  each of the
following additional conditions shall have been satisfied:

      a. Andrew H. Meyers shall have been elected  President and Chief Executive
      Officer of Langer,  and his  employment  with  Langer  shall not have been
      terminated by Langer without cause,  unless Mr. Meyers shall have declined
      to accept or continue employment;

      b. Stephen V. Ardia, Kenneth Granat,  Thomas I. Altholz and Justin Wernick
      shall have resigned from Langer's  board of directors and Andrew H. Meyers
      and  up to  four  individuals  designated  by  OrthoStrategies  reasonably
      acceptable  to the board of directors of Langer shall have been elected to
      Langer's  board of directors  (unless  OrthoStrategies  fails to designate
      acceptable nominees);

      c. The  Shareholders  Agreement  shall be in full force and effect  unless
      breached or terminated by OrthoStrategies;

      d. Langer shall have issued and outstanding no more than 2,613,181  Shares
      plus such number of Shares as may be issued  pursuant  to the  exercise of
      options outstanding as of the commencement of the Offer;

      e. Langer's  Agreements with its current bank, American National Bank, and
      the extension  thereof to the earlier to occur of February 28, 2001 or the
      Closing of the Offer shall remain in full force and effect;

      f. Langer shall have obtained all consents,  agreements  and  governmental
      approvals  necessary or appropriate for  consummation of the Offer,  other
      than those relating to agreements  which provide for payment or receipt by
      Langer of less than $12,500;

      g.  except for the  bonuses  and  severance  payments  discussed  above in
      Section 11 -- "Tender  Offer  Agreement:  Certain  Agreements  with Langer
      Management" consummation of the Offer will not give rise to any obligation
      for severance,  bonuses,  change of control or "golden parachute" payments
      to any of Langer's employees;

      h. the OS Option Agreement and the related  Registration  Rights Agreement
      shall have been  executed and delivered by Langer and the OS Options shall
      have been granted;

      i. No change shall have  occurred in any  governmental  regulation  of and
      reimbursement  rules  relating to the  business of Langer or its  products
      which has a Company Material Adverse Effect;

      The foregoing  conditions are for the sole benefit of OrthoStrategies  and
may be asserted by  OrthoStrategies  regardless of the circumstances  (including
any action or inaction by  OrthoStrategies  other than a material breach of this
Agreement) giving rise to such condition or may be waived by OrthoStrategies, in
its sole discretion,  by express and specific action to that effect, in whole or
in part at any time and from time to time.

14. Dividends and Distributions

      Pursuant  to the Tender  Offer  Agreement,  Langer  has agreed  that until
termination of the Tender Offer Agreement,  Langer may not declare, set aside or
pay any dividend payable in cash, stock or property with respect to the Shares.

15. Certain Legal Matters

      Except  as  otherwise  disclosed  herein,  based  upon an  examination  of
publicly available filings with respect to Langer,  OrthoStrategies is not aware
of any licenses or other  regulatory  permits which appear to be material to the
business of Langer and which might be adversely  affected by the  acquisition of
the Shares by OrthoStrategies  pursuant to the Offer or of any approval or other
action by any  governmental,  administrative  or regulatory  agency or authority
which  would be  required  for the  acquisition  or  ownership  of the Shares by
OrthoStrategies  pursuant to the Offer. Should any such approval or other action
be required, it is currently  contemplated that such approval


                                       24
<PAGE>

or action  would be sought or  taken.  There can be no  assurance  that any such
approval or action, if needed, would be obtained or, if obtained,  that it would
be obtained without  substantial  conditions or that adverse  consequences might
not result to Langer's or  OrthoStrategies'  business or that  certain  parts of
Langer's or  OrthoStrategies'  business  might not have to be disposed of in the
event that such  approvals  were not  obtained  or such other  actions  were not
taken, any of which might enable OrthoStrategies to elect to terminate the Offer
without the purchase of the Shares  thereunder,  if the relevant  conditions  to
termination  were  met.  OrthoStrategies'  obligation  under  the  Tender  Offer
Agreement  to accept  for  payment  and pay for the Shares is subject to certain
other conditions. See Section 13.

      Under  the  Hart-Scott-Rodino  Antitrust  Improvements  Act  of  1976,  as
amended,  and the rules that have been  promulgated  thereunder  by the  Federal
Trade  Commission  ("FTC"),   certain   acquisition   transactions  may  not  be
consummated  unless  certain  information  has been  furnished to the  Antitrust
Division of the  Department  of Justice and the FTC and certain  waiting  period
requirements   have  been   satisfied.   The   acquisition   of  the  Shares  by
OrthoStrategies is not subject to these requirements.

State Takeover Laws

      Section 912 of the New York  Business  Corporation  Law (the "BCL") limits
the ability of a New York corporation to engage in "business  combinations"  (as
defined in the BCL) with an "interested  stockholder"  (defined generally as any
beneficial  owner  of 10%  or  more  of  the  outstanding  voting  stock  of the
corporation)  unless,  among other things, the corporation's  board of directors
has given its  approval to the  business  combination  prior to the  shareholder
becoming an interested stockholder. Langer's board of directors has granted such
approvals  and taken  such  actions  as are  necessary  so that the Offer may be
consummated  as promptly as  practicable  on the terms  contemplated.  Since the
Langer  Board has  approved the  transactions  contemplated  by the Tender Offer
Agreement,  OrthoStrategies  (or its  affiliates)  would  not be  considered  an
"interested  stockholder"  and,  therefor,  would not be prevented or prohibited
from  effectuating a business  combination with Langer after the purchase of the
Shares  pursuant to the Offer  contemplated  hereby,  so long as the  subsequent
business  combination  is approved by Langer's then board of directors,  and the
Langer  board of  directors  has  otherwise  acted to  eliminate or minimize the
effects of such statute or regulation on the transactions contemplated hereby.

      Based on information  supplied by or on behalf of Langer,  OrthoStrategies
does not  believe  that any state  takeover  laws  purport to apply to the Offer
other than the  "Security  Takeover  Disclosure  Rules" of the State of New York
promulgated  pursuant to Article 16 of the BCL.  OrthoStrategies  has filed with
the Bureau of Investor Protection and Securities of the Department of Law of the
State of New York the Registration  Statement  required by the New York Security
Takeover  Disclosure Rules.  OrthoStrategies has not currently taken any actions
necessary  to comply  with any  other  state  takeover  statute  or  regulation.
OrthoStrategies reserves the right to challenge the applicability or validity of
any state law purportedly  applicable to the Offer, other than that of the State
of New York,  and  nothing in this  Offer to  Purchase  or any  action  taken in
connection  with the  Offer is  intended  as a waiver  of such  right.  If it is
asserted that any state  takeover  statute,  other than that of the State of New
York, is applicable to the Offer and if an appropriate  court does not determine
that it is  inapplicable  or invalid  as  applied to the Offer,  OrthoStrategies
might be required to file  certain  information  with,  or to receive  approvals
from, the relevant state  authorities,  and  OrthoStrategies  might be unable to
accept for payment or pay for any Shares tendered pursuant to the Offer. In such
case,  OrthoStrategies  may not be obliged to accept for  payment or pay for any
Shares tendered pursuant to the Offer.

16. Fees and Expenses

      Mackenzie Partners, Inc. is acting as Information Agent in connection with
the Offer.  The Information  Agent may contact holders of the Shares by personal
interview,  mail,  telephone,  telex,  telegraph and other methods of electronic
communication and may request brokers, dealers, banks, trust companies and other
nominees to forward the Offer materials to beneficial  holders.  The Information
Agent will receive  reasonable and customary  compensation for its services,  be
reimbursed  for certain  reasonable  out-of-pocket  expenses and be  indemnified
against  certain  liabilities  and  expenses in  connection  with its  services,
including certain liabilities under the Federal securities laws.

      Registrar and Transfer Company is acting as Depositary Agent in connection
with the Offer. OrthoStrategies will pay the Depositary reasonable and customary
compensation for its services in connection with the Offer,  plus  reimbursement
for out-of-pocket  expenses,  and will indemnify the Depositary  against certain
liabilities and


                                       25
<PAGE>

expenses  in  connection  therewith,  including  liabilities  under the  Federal
securities laws. Brokers, dealers,  commercial banks and trust companies will be
reimbursed  by  OrthoStrategies  for  customary  mailing and  handling  expenses
incurred by them in forwarding material to their customers.

17. Miscellaneous

      The Offer is not being made to (nor will  tenders be  accepted  from or on
behalf of) holders of the Shares in any  jurisdiction in which the making of the
Offer or the acceptance thereof would not be in compliance with the laws of such
jurisdiction.  However,  OrthoStrategies may, in its sole discretion,  take such
action as it may deem necessary to make the Offer in any such  jurisdiction  and
extend the Offer to holders of the Shares in such jurisdiction.

      OrthoStrategies  is not aware of any  jurisdiction  in which the making of
the Offer or the acceptance of the Shares in connection  therewith  would not be
in compliance with the laws of such jurisdiction.

      OrthoStrategies  has filed a  Schedule  TO with the SEC  pursuant  to Rule
l4d-3 of the General Rules and  Regulations  under the Exchange Act,  furnishing
certain  additional  information  with  respect  to  the  Offer,  and  may  file
amendments  thereto.  The  Schedule  TO and any  amendments  thereto,  including
exhibits,  may be examined and copies may be obtained from the principal  office
of the SEC in Washington, D.C.

      No  person  has  been  authorized  to give  any  information  or make  any
representation  on behalf of  OrthoStrategies  not  contained  in this  Offer to
Purchase or in the Letter of Transmittal and, if given or made, such information
or representation must not be relied upon as having been authorized.

                                   OrthoStrategies Acquisition Corp.

January 10, 2001,


                                       26
<PAGE>

                         Tender of Shares to Depository

      Manually signed  facsimile  copies of the Letter of Transmittal,  properly
completed  and duly  executed,  will be  accepted.  The  Letter of  Transmittal,
certificates  for the Shares and any other required  documents should be sent or
delivered by each shareholder of Langer or his  broker-dealer,  commercial bank,
trust company or other nominee to the Depositary as follows:

                        The Depositary for the Offer is:

                          Register and Transfer Company

By Registered Mail:            By Hand Delivery:         By Overnight Courier:
 10 Commerce Drive             10 Commerce Drive           10 Commerce Drive
    Cranford,                      Cranford,                    Cranford,
 New Jersey 07016               New Jersey 07016            New Jersey 07016

                           By Facsimile Transmission:
                                 (908) 497-2311

                      Confirm Facsimile by Telephone Only:
                              (908) 497-2300 x2556

      Any questions or requests for assistance or additional copies of the Offer
to Purchase and the Letter of Transmittal, the Notice of Guaranteed Delivery and
related  materials  may be directed to the  Information  Agent at its  telephone
number and location  listed  below.  You may also  contact your broker,  dealer,
commercial bank or trust company or other nominee for assistance  concerning the
Offer.

                     The Information Agent for the Offer is:

                                   MACKKENZIE
                                 PARTNERS, INC.

                                156 Fifth Avenue
                            New York, New York 10010
                          (212) 929-5500 (Call Collect)
                                       or
                          Call Toll-Free (800) 322-2885

                       Email: [email protected]



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