1. Active carbon filters isolate 99% of dust, chemicals, fumes and particulates 2.Mesh Mask shell is great for warmer environments, as it allows maximum ventilation to your skin, while firmly holding the filter and valves in place 3.Adjustable nose clip helps ensures 360 degree seal and avoid lens fogging 4. Hanging Ear Design keep the mask from slipping 5. Adjustable hook & loop Strap get the perfect fit. Easy on, easy off 6.Dual one-way discharge valves exhaled breath goes out, and doesn't heat up inside mask 7. The mesh dust mask shell and valves can be washed when they get dirty, the N99 filter is replaceable.