NIOSH filter approved rating for at least 95 percent filtration efficiency against certain non-oil based particles3M(TM) Cool Flow(TM) Exhalation Valve for cooler, drier comfortIt is ideally suited for hot/dusty work settings that require long periods of wearCompatible with a variety of protective eyewear and hearing protectionM-Noseclip adjusts easily for fewer pressure points and greater comfortAdjustable nose clip reduces potential for eyewear fogging and helps ensure a better seal and fitBraided headbands two-strap design with dual point attachment helps provide a secure seal