This Particulate Respirator is suggested for use in environments that are hot, humid, and dusty. Perfect for such applications as welding, grinding, sanding, underground mining, and poultry, the 2700 N95 is 95% efficient against particulate aerosols free of oil. Dura-Mesh® shell with a Softspun® lining add comfort and durability.HandyStrap®and Ventex® valve assures cool, comfortable breathability. Available in Small and Medium/Large sizes. Certified under NIOSH 42CFR84 Standards. Sold 10 per box.