RZ Dust/Pollution Mask w/2 Laboratory Tested Filters, Model M1, Spitfire, Size Regular/Large Neoprene Construction . Tough-duty durability 99.9% Replaceable Active Carbon Filters Dual one-way discharge valves . Reduce condensation Adjustable nose clip .Prevent fogging Adjustable Velcro Strap . Universal fit Filters tested at Nelson Laboratories, USA