April 08, 2005




Securities and Exchange Commission
Division of Corporation Finance
Mail Stop 0510
Washington, DC 20549-0510
Via EDGAR

Attn:             Rufus Decker
                  Accounting Branch Chief

Re:               Aearo Company I
                  Form 10-K for the fiscal year ended September 30, 2004
                  Form 10-Q for the period ended December 31, 2004
                  File No. 333-116676

Dear Mr. Decker:

AearoCompany  I  (the  "Company")  has  received  the  Staff's  comments  on the
Company's  Form 10-K for the fiscal year ended  September  30, 2004 and its Form
10-Q for the period  ending  December 31, 2004.  Set forth below are the Staff's
comments as well as the Company's responses to each of the Staff's comments.

                 FORM 10-K FOR THE YEAR ENDED SEPTEMBER 30, 2004

Comment applicable to your overall filing

Comment 1:  Where a  comment  below  requests  additional  disclosures  or other
            revisions to be made, please show us in your supplemental response
            what the revisions will look like. These revisions should be
            included in your future filings.

Response:   Where a comment has requested  additional  disclosures or other
            revisions, we have provided  additional  disclosures that will be
            incorporated into future filings.

Comment 2:  In connection with responding to our comments, please  provide,  in
            writing, a statement from the company acknowledging that:

                The company is responsible for the adequacy and accuracy of the
                disclosure in their filings;

                staff comments or changes to disclosure in response to staff
                comments do not foreclose the Commission  from taking any action
                with respect to the filing and

                The company may not assert  staff  comments as a defense in any
                proceeding  initiated by the  Commission  or any person under
                federal securities laws of the United States.



Response:   The Company  acknowledges  its  responsibility  for the adequacy
            and accuracy of the  disclosures in our filings.  We
            understand  that changes to our disclosure in response to staff
            comments do not preclude the Commission  from taking any action
            with  respect to our filings.  We also  understand  that we may
            not assert staff  comments as a defense in any proceeding
            initiated by the Commission or any person under federal
            securities laws of the United States.

Item 8.  Financial Statements and Supplementary Data

1.  Basis of Presentation, page 40

Comment 3:  Please tell us how you determined that your trademarks and trade
            names have indefinite  lives.  Refer to paragraph 11 of SFAS 142.

Response:   Following is a summary of the  characteristics  that the Company
            considered  and the events and  circumstances  that caused us to
            conclude that our trademarks have indefinite lives:

                a) The expected use of the asset by the entity.  The  Company's
                   trademarks  are used to market our  well-recognized  brand
                   names and  include:  E-A-R(R),  AOSafety(R),   Peltor(R),
                   SafeWaze(R),   yellow  E-A-R(R)  Classic(R)  and  E-A-R
                   Specialty Composites.  These brands are well known within our
                   industry as well as our customer  base.  We believe our
                   customers rely on our brand reputation when selecting
                   personal  protection  products and these products have
                   been sold under the E-A-R(R) and E-A-R(R) Specialty
                   Composites  trademarks since the early 1970s, the SafeWaze(R)
                   trademark since the mid 1990s and the Peltor(R) and
                   AOSafety(R)  trademarks  since the 1950s.  The Company plans
                   to  continuously  promote its brands  utilizing the above
                   trademarks and trade names as well as continue to develop and
                   introduce new products under the above trademarks and trade
                   names indefinitely.

                b) The  expected  use of another  asset or group of assets to
                   which the  useful life of the  intangible  asset may  relate.
                   The Company's  trademarks are not related to and do not rely
                   on any other asset,  other than the AOSafety(R) marks which
                   the right to its use has been  conveyed  via a perpetual  no
                   fee license as a result of the Company's purchase of certain
                   assets from American Optical, that would limit the useful
                   life of its trademarks.

                c) Any legal,  regulatory or  contractual  provisions  that may
                   limit the useful life.  The Company's  trademarks and trade
                   names are not  subject to legal or  regulatory  provisions
                   that would  limit  their  useful  lives.  The  Company
                   maintains detailed schedules of all trademarks and trade
                   names by category,  registration date, filing date, next
                   action date and renewal date for both U.S and international
                   registrations.

                d) Any legal,  regulatory or contractual  provisions that enable
                   renewal or extension  without  substantial  costs. The
                   Company's trademarks and trade names are not subject to legal
                   or regulatory  provisions  that prevent the Company from
                   renewing  or  extending  the useful  lives.  The  process of
                   renewal is routine and the costs are nominal in both the U.S.
                   and abroad.  The Company has historically been successful in
                   the renewal process.

                   The Company may, from time to time,  defend its intellectual
                   property rights when the Company believes that a competitor
                   has violated such  intellectual  property rights.  Such
                   defenses would involve product specific trademarks and trade
                   names and may cause temporary  volatility (positive in the
                   case of a favorable judgment and negative in the case of an
                   unfavorable judgment) or an interruption  of cash flows.  In
                   the Company's opinion, it would be remote that the Company
                   would lose a defense to sell  products  under its  well-known
                   brand names. In addition,  in many instances the remedy to an
                   intellectual  property dispute can be resolved with mino
                   product modifications and cause only a minor interruption of
                   cash flows.

                e) The effects of  obsolescence,  demand,  competition and other
                   economic factors (such as the stability of the industry,
                   known technological advances, legislative action that results
                   in uncertain or changing regulatory environment and expected
                   changes in  distribution  channels).  The Company reviews
                   economic and market  conditions for the Personal  Protection
                   Equipment ("PPE") industry and expects that the PPE market
                   will continue to experience modest and stable growth
                   considering the following factors:

                        Employers are increasingly  aware of the rising costs of
                        insurance and liabilities related to worker injuries and
                        the savings that can be realized through consistent use
                        of effective PPE.

                        Government  regulations  promulgated  by  regulatory
                        agencies  such as the  Occupational  Health  and  Safety
                        Administration ("OSHA"),  the European Committee for
                        Standardization  (CE") and the National Institute of
                        Occupational Safety and Health  ("NIOSH") that mandate
                        the use of PPE for certain job  classifications.  In
                        addition, global companies, who expand their
                        manufacturing  operations in emerging markets,  are
                        adopting safety standards in the absence of local
                        government regulation.

                        Improvements  in comfort, performance and style increase
                        the acceptance of PPE by users.  We believe that
                        industrial  users are more likely to use comfortable and
                        stylish products,  thereby increasing  regulatory
                        compliance and reducing the risk of injury. Such
                        products  are  particularly  important  to the  consumer
                        and do it yourself ("DIY") markets.

                        PPE products are increasingly  offered outside of the
                        traditional  industrial markets.  Consumers now
                        recognize the importance of safety due to the expansion
                        of the retail DIY market.

                        The expansion of military spending and homeland security
                        concerns has led to increased awareness and market
                        demand for the Company's products.

                   Obsolescence  is not a  significant  issue  with  regard to
                   the nature of our  products. In addition, our industry is not
                   prone to volatility due to technological advances.

                f) The level of  maintenance expenditures required to obtain the
                   expected  future cash flows from the assets (for  example,  a
                   material  level of required  maintenance  in relation  to the
                   carrying  amount of assets may suggest a very limited useful
                   life).

                   Due to the fact that our trademarks  and trade names are well
                   established  and have been in existence  for   many decades,
                   there are minimal maintenance  expenditures  necessary to
                   continue the indefinite future cash  flows from these assets.

                The Company continually reviews its finite-lived and
                infinite-lived  intangible  assets for events or changes in
                circumstances that might indicate the carrying amount of the
                assets may not be recoverable.

Note 11. Commitments and Contingencies

Contingencies, page 61

Comment 4:      We have read your response to comment 17. We acknowledge  your
                concerns.  However,  we feel as though the  information
                relating to your probable  product  liabilities for asbestos and
                silica-related  claims requested below is important for readers.
                Please disclose separately for each of these types of claims the
                following:

                   A  rollforward  for each period  presented  of your claims
                   activity that shows the number of claims at the  beginning of
                   the period, increases in the number of claims, the number of
                   claims settled, and the ending number of claims.

                   The average settlement amount for cases closed in each
                   period.

Response:       Below is the information requested for the claims in which Aearo
                is named as a defendant and will be added to the MDA in future
                10-K filings:



Claims (Number of Plaintiffs) Against Aearo


- ------------------------- ------------ ---------------
    2003                       Silica        Asbestos
- ------------------------- ------------ ---------------
Number of claims at               135             563
beginning
- ------------------------- ------------ ---------------
Increases in number of          6,476           3,842
claims
- ------------------------- ------------ ---------------
Number of claims settled           13             245
- ------------------------- ------------ ---------------
Number of claims                  128              12
dismissed without
payment
- ------------------------- ------------ ---------------
Ending number of claims         6,470           4,148
- ------------------------- ------------ ---------------
Average settlement             $24.36          $83.24
amount for claims
settled
- ------------------------- ------------ ---------------
Average settlement              $2.24          $79.35
amount for claims closed
- ------------------------- ------------ ---------------



- ---------------------- ---------------- --------------
    2004                      Silica        Asbestos
- ---------------------- ---------------- --------------
Number of claims at              6,470         4,148
beginning
- ---------------------- ---------------- --------------
Increases in number              4,554           152
of claims
- ---------------------- ---------------- --------------
Number of claims                     0             1
settled
- ---------------------- ---------------- --------------
Number of claims                    22            38
dismissed without
payment
- ---------------------- ---------------- --------------
 Ending number of                11,002         4,261
claims
- ---------------------- ---------------- --------------
 Average settlement                 N/A            $0
amount for claims
closed
- ---------------------- ---------------- --------------
Average settlement                  $0            $0
amount for claims
closed
- ---------------------- ---------------- --------------



All  data was provided  by the law firm of Simon, Peragine, Smith and Redfearn,
L.L.P., which tracks numbers of cases and settlements on behalf of the "AO
Defense Group" and is believed to be materially accurate. The AO Defense
Group is a voluntary association of current and former manufacturers of the
"AO Safety" brand of respirators and certain of their insurers in which
Aearo participates and through which all of its settlements have been
handled in the relevant years. In addition to the above claims, Aearo may
agree to pay a share of the settlement in particular cases even though the
company is not named as a defendant because of indemnity agreements with
prior owners of the brand and/or because of allegations that Aearo has some
risk of legal liability as a successor ("additional claims"). Aearo paid a
total of $1,671,593 for 4,325 claims that were settled between October 1,
2002 and September 30, 2004 involving both claims where Aearo was named as
a defendant and additional claims for an average of $386 per claim. In
addition, Aearo may receive the benefit of releases in some additional
cases settled by the AO Defense Group regardless of whether or not any
claim was made against Aearo.





We trust the foregoing is responsive to the Staff's comments.



                                 Very truly yours,



                                 Aearo Company I



                                Jeffrey S. Kulka
                                Senior Vice President, Chief Financial
                                Officer and Secretary