This disposable N95 particulate respirator is designed for the aluminum industry and helps protect against certain non-oil based particles including those present with nuisance levels of acid gases*. It featrues 3M™ Cool Flow™ Valve for added comfort. Benefits Carbon layer reduces exposure to nuisance levels* of acid gases 3M™ CoolFlow™ Valve Adjustable M nose clip Braided head bands and soft inner materials Spacious and durable