Medline NON27361A Surgical Face Mask, Anti-Fog, Pleated Style, Adhesive, Latex Free, Green (Pack of 300) Anti-fog Surgical Masks are designed to create a seal between the mask and user's face to prevent fogging Technology in the form of adhesive keeps condensation from escaping out the top of the mask, thus preventing eyeglasses from fogging and ensuring optical clarity Cellulose inner facings create a non-irritating and soft feeling, leaving the wearer cool and comfortable BFE &gt; 98%, PFE &gt; 97%