Best-in-class filtration and comfort with 360-degree seal Breathable mesh material û cool and comfortable F1 Filters remove up to 99.9% of particulates down to .1 micron in size û surpassing the N95 testing standard Dual one-way discharge valves reduce moisture inside the mask Adjustable nose clip eliminates any fogging of your glasses Washable and reusable. MASK M2 BLACK MD