Safety Works Toxic Dust Respirator, Mask Size: M, TPE, Filter Efficiency: 99.97 %, Filter Class: P100, Bayonet Connection, 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 limitationIncluded P100 low-profile cartridges feature rear-entry air flow that helps keep debris out of filter and makes fit checking easierThe 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/doffingLatex freeThis face piece is only compatible with SWX series replacement cartridges