These washable face masks are made of light weight and skin-friendly cotton which are comfortable and protective with replaceable carbon filters. Highly elastic and comfortable fabric can Improves ventilation, minimizes condensation and the accumulation of sweat and increases comfort. The rapid exhalation valves with a plurality of holes, the air breathing valve, offer maximum ventilation without sacrificing filtration. Strap for dust not easy to slip, more comfortable to adjust the size to suit the type of head more. To prevent fogging. Your brand name can be printed perfectly on the side.