Mesh Mask Shell: Breathable, durable, mesh mask shell. Air-permeable technical fabric that allows your skin to breathe in hot climate applications Active Carbon Filters: Active carbon filters isolate dust, pollen, mold, fumes, common airborne irritants, and other non-oil based particles Adjustable Nose Clip: Adjustable nose clip helps seal and avoid lens fogging Hanging Ear Design: Earloop design keeps the mask from slipping Adjustable Loop Strap: Adjustable velcro loop strap helps keep a snug fit while preventive slippage during athletic activities Dual One-Way Discharge Valves: Exhalation valve is designed to release hot, humid exhaled breath quickly, helping to prevent an unpleasant build-up of heat inside the facepiece Re-Usable and Washable: The outer mesh can be washed when needed. The inner filters and valves are easily replaceable