NIOSH approved for at least 95 percent filtration efficiency against certain non-oil based particles 3M Cool Flow Exhalation Valve helps reduce heat build-up inside the respirator M-Noseclip adjusts easily for fewer pressure points and greater comfort. Braided headbands two-strap design with dual point attachment helps provide a secure seal Spacious and durable Designed to increase comfort and wearability Advanced Electret Media is designed for ease of breathing