SoftSeal, 10 Pack, Extra Large, N95 Valve Mask, 360 Degree Silicone Seal Molds To Your Face Maintaining The Seal Even While Speaking Or Moving, As You Inhale, The Thin, Feathered Edge Of The Silicone Seal Tightens To Your Face, Molded In Adjustable Nose Clip Can Be Shaped To Your Nose & Won't Peel Off, Internal Skeleton Prevents Mask Collapse While Breathing & Improves The Mask's Durability, No Fog Design Keeps Goggles & Glasses Fog Free, Provides Protection Against Airborne Bacteria, Molds & Viruses Including H1n1 & Swine Flu, Protects Against Allergens, Smoke, Ash, Soot & Fine Particle Air Pollution, Meets CDC Guidelines For Tb Exposure Control.