Face mask with PM 2.5 filters made of soft cotton material, breathable, washable and reusable. With adjustable nose bridge and hook strap, fit a variety of face, easy and comfortable to wear. Haze mask fitted with a breathing valve that automatically opens and closes, allowing you to breathe smoothly. New Lab tested filtration technology filters over 95% of pollution, apply to PM 2.5, haze, dust, pollen, Package Includes: 2 pieces cotton masks; 4 pieces replaceable filter.