NIOSH approved for at least 95 percent filtration efficiency against certain non-oil based particles3M™ Cool Flow™ Exhalation Valve helps reduce heat build-up inside the respiratorM-Noseclip adjusts easily for fewer pressure points and greater comfort.Braided headbands two-strap design with dual point attachment helps provide a secure sealM-Noseclip adjusts easily for fewer pressure points and greater comfort