High-efficiency electrostatic filter cotton reduces expiratory resistance to improve wearing comfort. Perfect for non-oily particulate matter, such as PM2.5, smog, dust. It provides a minimum filtration efficiency of 95%. Ergonomic design, fit your face perfectly. Soft inner material and seamless design at the chin, comfortable to wear. An adjustable nose clip and two elastic fastening straps create a secure seal for maximum protection. Foldable design, easy to carry. Fits for grinding, sanding, sweeping, sawing and other dusty operations use. Specifications: