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It can be cleaned with breathing valve masks! Replaceable filter， so you no longer wear masks breathing difficulties! Each mask distribution two PM2.5 filter. With breathing valve masks， breathing easily smooth， stress-free. Replaceable filter， the filter is strong， breathable， masks can be washed repeatedly used in the outer layer are made of high quality cotton fabrics， comfortable skin-friendly; with breathing valve mask is the first choice of those glasses， so you do not have mist!