COMMON STOCK AND WARRANT PURCHASE AGREEMENT



          THIS  COMMON  STOCK  AND  WARRANT  PURCHASE  AGREEMENT  is dated as of
November  15,  2001  (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 HOLLY INVESTMENTS LIMITED, a company incorporated under the laws
of Turks & Caicos  Islands,  British West Indies,  having its principal place of
business  located at Gretton  House,  P.O. Box 65, Duke Street,  Grand Turk (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 buy from the  Company,  subject  to the terms and  conditions  set
forth herein,  $4,000,000 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 $4,000,000 (the "Aggregate  Amount")  divided by the Purchase Price (as
hereinafter defined),  resulting in 2,352,941 shares (the "Shares") to be issued
upon the payment of the Purchase Price.  Upon receipt of the Purchase Price, 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) As used herein  "Purchase Price" shall be equal to the average
of the  closing  bid price of the Common  Stock for the prior 15  trading  days,
reduced by a 16% discount to such average price, or $1.70 per share.

              (c) 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  articles 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


                                       2


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,  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;



                                       3


              (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 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) 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, 2000 and prior
to the date of this  Agreement,  pursuant to the  Securities Act or the Exchange
Act (collectively,  the "SEC Documents"). The SEC


                                       4


Documents  are the only  filings  made by or with  respect to the Company  since
December  31,  2000  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 November 1,
2000 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 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,  transferable divisible warrants (the "Investor Warrants" and, together
with the Finder's Warrants,  the "Warrants") to purchase up to 588,235 shares of
Common Stock.  Such Investor  Warrants shall bear an exercise price per share of
Common Stock equal to $2.55 and shall be exercisable, immediately upon issuance,
and for a  period  of five  (5)  years  thereafter.  Subject  to the  terms  and
conditions  of the Investor  Warrants,  the Company,  at its option,  may,  upon
written  notice to the Investor,  call up to one hundred  percent  (100%) of the
Investor Warrants if the Common Stock trades at a price equal to or greater than
$3.25 per  share for five (5)  consecutive  trading  days  prior to the date the
Company calls the Investor Warrants.



                                       5


              (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 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.

          5.  DELIVERY OF SHARES.  (a)  Promptly  following  the delivery by the
Investor of the Total 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


                                       6


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. 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:  John F. Moynahan, 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



                                       7


             Investor:         HOLLY INVESTMENTS LIMITED
                               Gretton House
                               P.O. Box 65
                               Duke Street, Grand Turk
                               Turks & Caicos Islands, British West Indies
                               ATTN:      C.B. Williams
                               Telephone No.:  (649) 946-2133
                               Facsimile No.:  (649) 946-2933

             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 No.:  (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.

          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 mailing a copy thereof to such party
at the address in effect for notices to it under this  Agreement 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.



                                       8


          10.  GOVERNING LAW. This Purchase  Agreement  shall be governed by and
interpreted in accordance  with the laws of the State of New York without giving
effect to choice of law provisions.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]







                                        9







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

                                            XYBERNAUT CORPORATION


                                            By: ________________________________
                                                   Name:
                                                   Title:

                                            HOLLY INVESTMENTS LIMITED


                                            By: ________________________________
                                                   Name:
                                                   Title:



                                       10