Exhibit 4.7



                  COMMON STOCK AND WARRANT PURCHASE AGREEMENT

         THIS  COMMON  STOCK  AND  WARRANT  PURCHASE  AGREEMENT  is  dated as of
December  20,  2004  (this  "Purchase  Agreement"),  by  and  between  XYBERNAUT
CORPORATION,  a Delaware  corporation,  having its  principal  place of business
located at 12701 Fair Lakes  Circle,  Suite 550,  Fairfax,  Virginia  22033 (the
"Company"),  and POLAR PROPERTIES LTD., a company incorporated under the laws of
Anguilla, having its principal place of business located at Mevot David 8, Ramat
Gan, Israel (the "Investor").

                               W I T N E S S E T H

         WHEREAS,  the Company wishes to sell to the Investor,  and the Investor
is willing to purchase from the Company, subject to the terms and conditions set
forth herein,  $3,500,000 (the "Purchase  Price") of shares of common stock, par
value $.01 per share (the "Common Stock"), of the Company.

         NOW, THEREFORE, for and in consideration of the premises and the mutual
agreement  contained herein and for other good and valuable  consideration,  the
receipt and  sufficiency  of which are hereby  acknowledged,  the parties hereto
agree as follows:

         1. PURCHASE AND SALE; MUTUAL  DELIVERIES.  (a) Upon the following terms
and  conditions,  the  Company  shall  issue  and sell to the  Investor  and the
Investor  shall  purchase from the Company that number of shares of Common Stock
equal to  $3,500,000  divided by $0.9272  cents per share,  which price is based
upon an  approximately  20%  discount  to the  average  closing bid price of the
Common  Stock for the ten (10)  trading  days  ending on  December  7, 2004 (the
"Closing Price"), resulting in 3,774,806 shares (the "Shares") to be issued upon
the  payment,  in cash or through  the  reduction  or  cancellation  of existing
indebtedness  of the  Investor,  of the  Purchase  Price.  Upon  receipt  of the
Purchase Price, which payment and receipt must occur no later than 5:00 p.m. New
York Time on or before  Monday,  December  20, 2004 (the  "Closing  Date"),  the
Company shall deliver to the Investor one or more certificates  representing the
Shares, bearing substantially the following legend:

         THE SECURITIES  REPRESENTED HEREBY (THE "SECURITIES") HAVE NOT
         BEEN  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED
         (THE  "SECURITIES  ACT"),  OR THE SECURITIES LAWS OF ANY STATE
         AND MAY NOT BE SOLD OR OFFERED  FOR SALE IN THE  ABSENCE OF AN
         EFFECTIVE  REGISTRATION  STATEMENT  FOR THE  SECURITIES  OR AN
         OPINION  OF  COUNSEL  OR  OTHER  EVIDENCE  ACCEPTABLE  TO  THE
         CORPORATION THAT SUCH REGISTRATION IS NOT REQUIRED.

            (b) The Company  shall also deliver,  or cause to be delivered,  the
original or execution copies of this Purchase Agreement.

         2.   REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY.   The  Company
represents and warrants to the Investor that:




            (a) The Company has the corporate  power and authority to enter into
this Purchase Agreement, and to perform its obligations hereunder. The execution
and delivery by the Company of this Purchase  Agreement and the  consummation by
the Company of the transactions contemplated hereby have been duly authorized by
all  necessary  corporate  action  on the  part of the  Company.  This  Purchase
Agreement has been duly executed and delivered by the Company and constitute the
valid and binding obligation of the Company enforceable against it in accordance
with  their  respective  terms,   subject  to  the  effects  of  any  applicable
bankruptcy,  insolvency,  reorganization,  moratorium or similar laws  affecting
creditors' rights generally and to general equitable principles.

            (b)  Except  as set  forth  in the  SEC  Documents  (as  hereinafter
defined),  there is no pending, or to the knowledge of the Company,  threatened,
judicial,   administrative  or  arbitral  action,  claim,  suit,  proceeding  or
investigation which might affect the validity or enforceability of this Purchase
Agreement or which involves the Company and which if adversely determined, could
reasonably be expected to have a material  adverse effect on the Company and its
subsidiaries taken as a whole.

            (c) No consent or approval of, or exemption by, or filing with,  any
party or governmental or public body or authority is required in connection with
the execution,  delivery and  performance  under this Purchase  Agreement or the
taking of any action contemplated hereunder or thereunder.

            (d) The Company has been duly organized and is validly existing as a
corporation  in  good  standing  under  the  laws  of  the  jurisdiction  of its
incorporation.

            (e) The execution, delivery and performance of this Agreement by the
Company, and the consummation of the transactions  contemplated hereby, will not
(i) violate any  provision of the  Company's  certificate  of  incorporation  or
bylaws, (ii) violate,  conflict with or result in the breach of any of the terms
of,  result in a material  modification  of the effect of,  otherwise,  give any
other contracting party the right to terminate, or constitute (or with notice or
lapse  of time or both  constitute)  a  default  under,  any  contract  or other
agreement  to which the  Company is a party or by or to which the Company or any
of the Company's assets or properties may be bound or subject, (iii) violate any
order,  judgment,  injunction,  award or  decree  of any  court,  arbitrator  or
governmental  or  regulatory  body  by  which  the  Company,  or the  assets  or
properties of the Company are bound and (iv) to the Company's knowledge, violate
any statute, law or regulation.

         3. REPRESENTATIONS AND WARRANTIES OF THE INVESTOR.  The Investor hereby
represents and warrants to the Company that:

            (a) The Investor has the corporate power and authority to enter into
this Purchase Agreement and to perform its obligations hereunder.  The execution
and delivery by the Investor of this Purchase Agreement, and the consummation by
the Investor of the transactions  contemplated hereby, have been duly authorized
by all necessary  corporate  action on the part of the  Investor.  This Purchase
Agreement has been duly  executed and  delivered by the Investor and  constitute
the valid and binding  obligation  of the  Investor,  enforceable  against it in
accordance with their respective terms, subject to the effects of any applicable
bankruptcy,


                                      -2-


insolvency,  reorganization,  moratorium  or similar laws  affecting  creditors'
rights generally and to general equitable principles.

            (b) The execution,  delivery and performance by the Investor of this
Purchase  Agreement,  and  the  consummation  of the  transactions  contemplated
hereby,  do not and will not breach or constitute a default under any applicable
law  or  regulation  or of any  agreement,  judgment,  order,  decree  or  other
instrument binding on the Investor.

            (c) The Investor has such knowledge and prior substantial investment
experience in financial and business matters, including investment in non-listed
and  non-registered  securities,  and has  had the  opportunity  to  engage  the
services  of an  investment  advisor,  attorney  or  accountant  to read the SEC
Documents  and to evaluate the merits and risks of investment in the Company and
the Securities.

            (d) The Investor is an "accredited investor" as that term is defined
in Rule 501(a) of Regulation D promulgated  under the Securities Act of 1933, as
amended (the "Securities Act").

            (e) The  Investor is not a "U.S.  Person" as that term is defined in
Regulation S promulgated under the Securities Act.

            (f) The Investor is acquiring the Shares,  the Investor Warrants (as
defined in Section  4(d)) and the shares of Common Stock  issuable upon exercise
of the Investor  Warrants (the "Warrant  Shares")  solely for the Investor's own
account for investment  and not with a view to or for sale in connection  with a
distribution  of any of the Shares or the Warrant  Shares (the Shares,  Warrants
and Warrant Shares collectively, the "Securities");

            (g) The  Investor  does not  have a  present  intention  to sell the
Securities, nor a present arrangement or intention to effect any distribution of
any of the  Securities  to or  through  any  person or entity  for  purposes  of
selling, offering, distributing or otherwise disposing of any of the Securities;

            (h) The Investor  may be required to bear the  economic  risk of the
investment indefinitely because none of the Securities may be sold, hypothecated
or otherwise disposed of unless subsequently registered under the Securities Act
and  applicable  state  securities  laws or an exemption  from  registration  is
available.  Any resale of any of the Securities can be made only pursuant to (i)
a registration statement under the Securities Act which is effective and current
at the  time  of  sale  or  (ii) a  specific  exemption  from  the  registration
requirements of the Securities Act. In claiming any such exemption, the Investor
will,  prior to any offer or sale or distribution  of any Securities  advise the
Company and, if requested,  provide the Company with a favorable written opinion
of counsel, in form and substance  satisfactory to counsel to the Company, as to
the applicability of such exemption to the proposed sale or distribution;

            (i) The Investor understands that the exemption afforded by Rule 144
promulgated by the Securities and Exchange  Commission  under the Securities Act
("Rule  144") will not become  available  for at least one year from the date of
payment  for the  Securities  and any sales in  reliance  on Rule  144,  if then
available,  can be made only in accordance with the terms and conditions of that
rule,  including,  among other things,  a  requirement  that the Company


                                      -3-


then be subject to, and current,  in its periodic filing  requirements under the
Securities  Exchange Act of 1934, as amended (the  "Exchange  Act"),  and, among
other  things,  a limitation on the amount of shares of Common Stock that may be
sold in  specified  time  periods  and the manner in which the sale can be made;
that,  while the Company's Common Stock is registered under the Exchange Act and
the Company is presently subject to the periodic  reporting  requirements of the
Exchange Act,  there can be no assurance that the Company will remain subject to
such reporting  obligations or current in its filing  obligations;  and that, in
case Rule 144 is not applicable to a disposition of the  Securities,  compliance
with the  registration  provisions of the Securities Act or some other exemption
from such registration provisions will be required; and

            (j) The Investor  understands  that  legends  shall be placed on the
certificates  evidencing the  Securities to the effect that the Securities  have
not been registered under the Securities Act or applicable state securities laws
and  appropriate  notations  thereof will be made in the Company's  stock books.
Stop  transfer  instructions  will be  placed  with  the  transfer  agent of the
securities constituting the Common Stock.

         4.  COVENANTS  OF THE COMPANY.  (a)  Registration  Rights.  The Company
covenants and agrees to enter into a registration rights agreement governing the
registration of the Securities with the Investor dated as of the date hereof.

            (b) Current  Public  Information.  The Company has furnished or made
available  to  the  Investor  true  and  correct  copies  of  all   registration
statements,  reports  and  documents,  including  proxy  statements  (other than
preliminary proxy statements), filed with the Securities and Exchange Commission
(the "SEC") by or with respect to the Company since  December 31, 2003 and prior
to the date of this  Agreement,  pursuant to the  Securities Act or the Exchange
Act (collectively,  the "SEC Documents"). The SEC Documents are the only filings
made by or with  respect to the Company  since  December  31,  2003  pursuant to
Sections  13(a),  13(c),  14 and 15(d) of the  Exchange  Act or  pursuant to the
Securities Act. The Company has filed all reports,  schedules, forms, statements
and other  documents  required to be filed under Sections  13(a),  13(c), 14 and
15(d) of the Exchange Act since  December 31, 2003 and prior to the date of this
Agreement. The Company meets the "Registrant Requirement" for eligibility to use
Form S-3 under the  Securities  Act in order to register  the  Company's  Common
Stock for resales.

            (c) SEC Documents.  The Company has not provided to the Investor any
information  which according to applicable law, rule or regulation,  should have
been  disclosed  publicly  prior to the date hereof by the Company but which has
not been so disclosed. As of their respective dates, the SEC Documents complied,
and all  similar  documents  filed with the SEC prior to the  Closing  Date will
comply,  in all material respects with the requirements of the Securities Act or
the  Exchange  Act,  as the case may be,  and rules and  regulations  of the SEC
promulgated  thereunder  and other  federal,  state and  local  laws,  rules and
regulations  applicable  to such SEC  Documents,  and none of the SEC  Documents
contained, nor will any similar document filed with the SEC prior to the Closing
Date  contain,  any untrue  statement  of a material  fact or omitted to state a
material  fact  required to be stated  therein or necessary in order to make the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading.  The financial  statements  of the Company  included in the SEC
Documents,  as of the dates thereof,  complied,  and all similar documents filed
with the SEC prior to the Closing Date


                                      -4-


will comply,  as to form in all material  respects  with  applicable  accounting
requirements  and the  published  rules  and  regulations  of the SEC and  other
applicable rules and regulations with respect thereto. Such financial statements
were  prepared in  accordance  with  generally  accepted  accounting  principles
applied on a consistent  basis during the periods involved (except (i) as may be
otherwise indicated in such financial statements or the notes thereto or (ii) in
the case of  unaudited  interim  statements,  to the extent they may not include
footnotes or may be condensed or summary statements as permitted by Form 10-Q of
the SEC) and fairly present in all material  respects the financial  position of
the Company and its  consolidated  subsidiaries  as of the dates thereof and the
consolidated  results of  operations  and cash flows for the periods  then ended
(subject,  in the  case  of  unaudited  statements,  to  normal  year-end  audit
adjustments).

            (d)  Warrants.  The Company  agrees to issue to the  Investor at the
Closing, two (2) transferable divisible warrants (collectively,  the "Warrants")
to  purchase  (i) up to  1,887,403  shares of Common  Stock  which shall bear an
exercise  price  per share of  Common  Stock of an  amount  equal to 100% of the
Closing Price and shall be  exercisable  immediately  upon  issuance,  and for a
period of three (3)  years  following  such  issuance  and (ii) up to  1,887,403
shares of Common  Stock which  shall bear an exercise  price per share of Common
Stock of an amount equal to 100% of the Closing  Price and shall be  exercisable
immediately  upon  issuance,  and for a period of six (6) months  following such
issuance.  Subject to the terms and conditions of the Warrants,  the Company, at
its option,  may, upon written  notice to the  Investor,  call up to one hundred
percent (100%) of the Warrants if the Common Stock trades at a price equal to or
greater than $3.00 per share for five (5) consecutive  trading days prior to the
date the Company calls the Warrants.

            (e) Reimbursement.  If (i) the Investor, other than by reason of its
gross negligence or willful misconduct,  becomes involved in any capacity in any
action,  proceeding or investigation  brought by any stockholder of the Company,
in  connection  with or as a  result  of the  consummation  of the  transactions
contemplated by this Purchase  Agreement,  or if such Investor  impleaded in any
such action,  proceeding or investigation  by any Person,  or (ii) the Investor,
other than by reason of its gross negligence or willful  misconduct or by reason
of its trading of the Common Stock in a manner that is illegal under the federal
securities  laws or other  actions,  becomes  involved  in any  capacity  in any
action,  proceeding  or  investigation  brought  by the  Commission  against  or
involving the Company or in connection  with or as a result of the  consummation
of the transactions  contemplated by this Purchase Agreement, or if the Investor
is impleaded in any such action, proceeding or investigation by any Person, then
in any such case,  the Company will  reimburse  the Investor for its  reasonable
legal  and  other  expenses   (including  the  cost  of  any  investigation  and
preparation) incurred in connection therewith, as such expenses are incurred. In
addition,  other than with respect to any such matter in which the Investor is a
named  party,  the Company will pay the  Investor  the  charges,  as  reasonably
determined  by the  Investor,  for the time of any  officers or employees of the
Investor devoted to appearing and preparing to appear as witnesses, assisting in
preparation for hearings,  trials or pretrial matters, or otherwise with respect
to inquiries,  hearing,  trials,  and other proceedings  relating to the subject
matter of this  Agreement.  The  reimbursement  obligations of the Company under
this  paragraph  shall be in  addition  to any  liability  which the Company may
otherwise  have,  shall  extend  upon  the  same  terms  and  conditions  to any
Affiliates of the Investors who are actually named in such action, proceeding or
investigation,  and  partners,  directors,  agents,  employees  and  controlling
persons (if any), as the case may be, of the  Investors and any such  Affiliate,
and shall


                                      -5-


be binding upon and inure to the benefit of any successors,  assigns,  heirs and
personal  representatives  of the Company,  the Investors and any such Affiliate
and any such  Person.  The Company also agrees that neither the Investor nor any
such Affiliate,  partners,  directors,  agents, employees or controlling persons
shall have any liability to the Company or any person asserting claims on behalf
of or in  right  of  the  Company  in  connection  with  or as a  result  of the
consummation of the transactions  contemplated by this Purchase Agreement except
to the extent that any losses, claims, damages, liabilities or expenses incurred
by the Company  result from the gross  negligence  or willful  misconduct of the
Investor or any such  Affiliate.  The Company  further  agrees to reimburse  the
Investor for its reasonable attorney's and other professional fees in connection
with the negotiation and execution of this Purchase Agreement.

            (f)  NASD  Compliance.  The  Company  shall  timely  provide  to the
Investor a copy of all  materials  required  to be filed by the  Company  and/or
received by the Company  from the National  Association  of  Securities  Dealers
("NASD") under  Corporate  Financing  Rule 2710,  and use reasonable  efforts to
cooperate  with the  Investor  and any  broker  selling  Shares on behalf of the
Investor to  facilitate  the  Investor  and/or  broker to obtain any  additional
consents,  authorizations  or approvals  that may be  necessary  for the NASD to
permit the Investor to sell the Shares.

         5.  DELIVERY OF SHARES.  (a)  Promptly  following  the  delivery by the
Investor  of the  Purchase  Price for the Shares in  accordance  with  Section 1
hereof, the Company will irrevocably instruct its transfer agent to issue to the
Investor legended certificates representing the Shares.

            (b) Within five (5)  business  days (such third  business  day,  the
"Delivery  Date") after the business day on which the Company has received  both
the notice of sale (by  facsimile or other  delivery)  and the  original  Common
Stock  certificate (and if the same are not delivered to the Company on the same
date,  the date of delivery of the second of such items),  the Company (i) shall
deliver,  and shall cause legal counsel  selected by the Company to deliver,  to
its transfer  agent (with copies to Investor)  an  appropriate  instruction  and
opinion of such counsel, for the delivery of unlegended Shares issuable upon the
sale of the  Shares  pursuant  to the  registration  statement  for the  Shares;
provided that such registration  statement at the time of sale has been declared
effective by the Commission and is current (the "Unlegended  Shares");  and (ii)
transmit the certificates  representing the Unlegended Shares (together,  unless
otherwise  instructed  by the  Investor,  with  Common  Stock not sold),  to the
Investor at the address  specified in a notice of sale (which address may be the
Investor's  address  for  notices  as  contemplated  by  Section  6 hereof  or a
different address) via express courier, by electronic transfer or otherwise.

            (c) In lieu of delivering  physical  certificates  representing  the
Unlegended  Shares,  if the Company's  transfer  agent is  participating  in the
Depository  Trust Company ("DTC") Fast Automated  Securities  Transfer  program,
upon request of the Investor and its compliance with the provisions contained in
this paragraph,  so long as the  certificates  therefor do not bear a legend and
the  Investor  thereof  is not  obligated  to return  such  certificate  for the
placement of a legend  thereon,  the Company shall use its best efforts to cause
its transfer agent to electronically transmit the Unlegended Shares by crediting
the account of Investor's  Prime Broker with DTC through its Deposit  Withdrawal
Agent Commission system.


                                      -6-


         6. NOTICES.  Any notice required or permitted  hereunder shall be given
in writing (unless otherwise  specified herein) and shall be deemed  effectively
given upon  personal  delivery or seven (7) business  days after  deposit in the
United  States  Postal  Service,  by (a) advance copy by fax, and (b) mailing by
express  courier or registered or certified  mail with postage and fees prepaid,
addressed  to each of the other  parties  thereunto  entitled  at the  following
addresses,  or at such  other  addresses  as a party may  designate  by ten days
advance written notice to each of the other parties hereto.

            Company:                  Xybernaut Corporation
                                      12701 Fair Lakes Circle, Suite 550
                                      Fairfax, Virginia  22033
                                      ATTN:  Chief Financial Officer
                                      Telephone No.:  (703) 631-6925
                                      Facsimile No.:  (703) 631-3903

            with a copy to:           Jenkens & Gilchrist Parker Chapin LLP
                                      The Chrysler Building
                                      405 Lexington Avenue
                                      New York, New York  10174
                                      ATTN:  Martin Eric Weisberg, Esq.
                                      Telephone No.:  (212) 704-6000
                                      Facsimile No.:  (212) 704-6288

            Investor:                 Polar Properties Ltd.
                                      Mevot David 8
                                      Ramat Gan, Israel
                                      Attn: Mary Lowenthal
                                      Telephone No.: _____________
                                      Facsimile No.: ______________

            with a copy to:           Krieger & Prager LLP
                                      39 Broadway, Suite 1440
                                      New York, New York  10006
                                      Attn:  Samuel Krieger, Esq.
                                      Telephone No.:  (212) 363-2900
                                      Facsimile: (212) 363-2999

         7. SEVERABILITY.  If a court of competent jurisdiction  determines that
any provision of this Purchase  Agreement is invalid,  unenforceable  or illegal
for any  reason,  such  determination  shall not affect or impair the  validity,
legality and enforceability of the other provisions of this Purchase  Agreement.
If any such  invalidity,  unenforceability  or illegality of a provision of this
Purchase  Agreement becomes known or apparent to any of the parties hereto,  the
parties  shall  negotiate  promptly  and in good  faith  in an  attempt  to make
appropriate  changes and  adjustments  to such provision  specifically  and this
Purchase Agreement generally to achieve as closely as possible,  consistent with
applicable  law, the intent and spirit of such provision  specifically  and this
Purchase Agreement generally.


                                      -7-


         8. EXECUTION IN COUNTERPARTS.  This Purchase  Agreement may be executed
in  counterparts,  each of which shall be deemed an  original,  but all of which
together shall constitute the same Purchase Agreement.

         9.  CONSENT TO  JURISDICTION.  Each of the Company and the Investor (i)
hereby  irrevocably  submits to the  jurisdiction  of the United States District
Court  sitting in the Southern  District of New York and the courts of the State
of New York located in New York county for the  purposes of any suit,  action or
proceeding  arising  out of or relating to this  Agreement  or the  transactions
contemplated hereby and (ii) hereby waives, and agrees not to assert in any such
suit, action or proceeding,  any claim that it is not personally  subject to the
jurisdiction of such court, that the suit, action or proceeding is brought in an
inconvenient  forum or that the  venue of the  suit,  action  or  proceeding  is
improper.  Each of the Company and the Investor consents to process being served
in any such suit, action or proceeding by any means permissible under applicable
law and agrees that such service shall constitute good and sufficient service of
process and notice thereof.  Nothing in this Section 9 shall affect or limit any
right to serve process in any other manner permitted by law.

         10.  GOVERNING LAW; Waiver of Jury. This Agreement shall be governed by
and  construed  in  accordance  with the laws of the State of New York,  without
regard to principles of conflicts of law thereof.  This  Agreement  shall not be
interpreted  or construed  with any  presumption  against the party causing this
Agreement to be drafted.  In any action,  suit or proceeding in any jurisdiction
arising out of or related  directly or  indirectly  to this  Agreement,  whether
brought by the Company against the Investor or the Investor against the Company,
the  Company  and  the  Investor   each  hereby   absolutely,   unconditionally,
irrevocably and expressly waives forever trial by jury.

                             [SIGNATURES CONTINUED]


                                      -8-




         IN WITNESS WHEREOF,  the parties have executed this Purchase  Agreement
as of the date first written above.

                                            XYBERNAUT CORPORATION


                                            By:
                                               ---------------------------------
                                               Name:
                                               Title:



                                            POLAR PROPERTIES LTD.


                                            By:
                                               ---------------------------------
                                               Name:
                                               Title:






                                      -9-