Main Features: 1. The use of environmentally friendly polyurethane sponge material, 3D split vault. skeleton, the face no sense of support. 2. Light breathing anti-haze masks, unbridled breathing, not just cool, filtration efficiency of more than 97% PM2.5, effectively blocking more than 0.3um bacteria. 3. TPU stretch film composite fine sponge, the more comfortable the band, comfortable ear hook design, strong tensile, flexible fit. 4. Food-grade selection, intimate personal protection, easy to breathe, even exercise can wear a smooth breathing. 5. Large-caliber cold flow breathing valve, and said wet bye-bye, large diameter cold flow breathing valve 40mm in diameter, 0.3mm thin silicone valve, return to natural breathing experience.