Conforms to American NIOSH 42 CFR Part 84 standard as N95 class, with filtration 95% effective against particulate aerosols free of oils. NIOSH Approval Number TC-84A-4277. Low breathing resistance for increased wearer comfort. Soft edges fit different facial shapes with minimum leakage. Foldable design, sealed edges avoids open layers and eliminates the possibility of irritation. Latex-free synthetic rubber head straps, adjustable nose clip, and soft foam nosepiece for comfortable, custom fit. Polypropylene (P.P.) outer/inner layer provides smooth lining and comfortable feel. Exhalation valve reduces hot air buildup and allows easier breathing in hot/humid environments.