Dust Mask with Valve N99 Mask Washable Cotton Mouth Masks with Replaceable Filter (One Mask + 5 Filters) (mask filters 10 pack)

The masks and filters are individually sealed Lab tested British military filtration technology filters almost 100% of pollution, gases, odors, dust, pollen, smog, PM2.5, germs, bacteria and viruses Masks are washable, and the filter can be replaced. Masks have a great filtering effect because they have 4 layers of filter. The first layer is skin friendly cotton, the second layer is silica gel layer, the third layer is pure cotton lining, the fourth layer is a filter with three layers of filter