Gateway Safety 80902V TruAir Ultra Vented P100 Particulate Respirator (Box of 5) Large, molded shell with polypropylene valve and valve seat and silicon membrane to help reduce breathing resistance, minimizing end-user fatigue Adjustable metal nose piece and facial-conforming polyurethane seal provide a safe, secure fit Non-latex woven elastic head straps adjust for different head sizes NIOSH approved 99.97 level protection with 99.97 percent filtration against particulate aerosols free of oils below the PEL Filtering material component of polypropylene spunbond scrim, Technostat electrostatic filter media, and 100% polyester web