Safety Works Multi-Purpose Half Mask Respirator, Mask Size: M, TPE, Filter Efficiency: 99.97 %, BlueFlexible facepiece material provides an excellent face-to-respirator seal which improves fit and comfortLong-life cartridges are approved to the NIOSH P100 Class, so they are at least 99.97% efficient against oil- and non-oil based contaminants and are oil-proof so they have no time use limitationThe cartridges are also NIOSH Approved against chlorine, hydrogen chloride, hydrogen sulfide and organic vaporsThe included hygiene cover helps keep dirt out of mask when not in use and helps keep shape of seal intactHeadband swivels on hinges for improved comfort and fitTwo-piece neck strap for easier donning/doffingThis face piece is only compatible with SWX series replacement cartridges, no other cartridges are certified to be fitted with this maskSoft thermal plastic elastomer facepiece for enhanced comfortIncludes a unique hygiene guard for clean storage and product protection