Description For hygiene safety, the exchange or return of the masks are not accepted. Please be sure before your purchase. Specifications: Name: protective Color: Blue Material: Non-woven fabric and meltblown fabric Applicable object: adults Gender: Unisex adult Function: Anti-smog PM2.5 Dust ,Particulate Filter (95% filter efficiency level). Package: 1/2/3pcs Features: *Disposable masks, Breathable,anti dust,sanitary and convenient for using. *This respirator is for at least 95 percent filtration efficiency against certain non-oil-based particles*This respirator is for at least 95 percent filtration efficiency against certain non-oil-based particles *3 layers design, filter the pollution, gases, odors, dust, pollen, smog, PM2.5, germs, bacteria and viruses effectively. *3D and light weight design, initial pressure drop makes you breathe easier. *High-quality elastic earband, easy to wear and comfortable. Instructions:Cover the nose and mouth and hang the ear straps on both sides of the mask on the ear;Fix the bridge of the nose in a nose to prevent dirty air from entering;Pull the mask to the lower jaw to create a three-dimensional breathing space.Best Wear time is 8 hours Note: Non-washable