KN95 Masks are CE and FDA certified. Current guidance requires the disclaimer that they are Not intended for use by front-line medical personnel. 95% filtration for particles ? 0.3 microns 4-Ply construction, including 1 inner layer of 50g melt blown polypropylene and 1 layer of cotton Comfortable, form-fitting design Adjustable nose bridge and elastic ear loops Complies with China Standard GB2626-2006 and European Standard EN149:2001+A1:2009