Our mask use pure cotton material, It is breathable. The nose clip and ear straps are easy to adjust. The antibacterial rate against bacteria is above 95%. The filtration efficiency for smog, automobile exhaust, dust, etc. In the air is above 95%. Respiratory resistance 684, far lower than the national standard of no more than 145, comfortable to wear without holding your breath. 100% high-quality pure cotton and warm-keeping filter cotton are healthy and warm-keeping. Antibacterial, protective and filtering properties have been tested by the national authoritative departments and qualified wells have obtained relevant patents.