Masks have an outer layer of apertured polyethylene film to provide protection from contamination. Nonsterile face masks offer excellent breathability with filtration of 99% at 0.1µ. These comfortable masks feature nonirritating BICOSOF* inner facing and a bendable aluminum nosepiece.

Sterile masks feature polyester binding and polyester filter media, which provides bacteria filtration efficiency of 91.9% and particle filtration efficiency of 93.1%. Sterile masks are gamma-sterilized to 10-6. All masks are individually packaged. Packs are double bagged.