◆Conforms to American NlOSH 42 CFR Part 84 standard as N95 class, with filtration 95% effective against particulate aerosols free of oils. NIOSH Approval number TC-84A-4521. ◆Low breathing resistance for increased wearer comfort. Foldable seal avoids open layers around the edges . ◆Latex-free Lycra welded head straps , adjustable nose clip and soft foam nosepiece for comfortable custom fit. ◆With polypropylene(P.P.) outer layers provides smooth lining and soft foam.