Optimer Grants Dri-release® License To Salvadoran Producer, Unveils E.C.O. Variant

Optimer Performance Fibers, Wilmington, Del., has granted its first license to a textile
manufacturer in Central America for the use of its Dri-release® with FreshGuard® patented
moisture-management technology.

Textufil, an El Salvador-based manufacturer of yarn, thread and finished fabrisc, initially
will use the technology in polyester/cotton fabric containing its Siro Dri-release yarn. In time,
it will add other Dri-release variants including Dri-release E.C.O. (Environmentally Correct
Origins™), Optimer’s newest version that contains recycled polyester and natural fibers.

Dri-release E.C.O. is debuting in Portland, Ore.-based KEEN Footwear’s Off-Road Mt. Airy
sock, which will contain recycled polyester and organic cotton. KEEN, an outdoor footwear and
accessories supplier that provides hybrid performance products and is committed to environmental
and social causes, previewed the sock last week at the Outdoor Retailer show in Salt Lake City, and
will offer it to retailers for Fall 2008.

Optimer also plans to offer a recycled polyester/wool version of Dri-release E.C.O.

January 29, 2008