Best-in-class filtration and comfort with 360-degree seal Durable Neoprene material helps keep you comfortable in cool temperatures Dual one-way discharge valves reduce moisture inside the mask Adjustable nose clip eliminates any fogging of your glasses F1 Filters remove up to 99.9% of particulates down to .1 micron in size รป surpassing the N95 testing standard Washable and reusable Includes storage bag. MASK M1 NATURAL MD