Soft foam anti-fog strip prevents fogging of eyeglasses. Excellent fiber pin down reduces facial irritation. Precept offers several anti-fog masks designed to help ensure optical clarity, including a mask specifically for use with sensitive skin. Specialty masks are available with either foam, fi lm, or tape antifog strips. Tape anti-fog masks feature non-allergenic, pressure sensitive tape that provides a secure seal. Foam anti-fog masks include a strip of soft foam that cushions against the nose and cheeks. Precepts fi lm anti-fog mask incorporates a plastic fi lm strip on both the inside and outside of the mask. Precept also manufactures specialty masks utilizing its exclusive Stretch Knit™ ties which enable the wearer to adjust the tie tension for a snug fi t, thereby reducing blow-by.