3M™ Reusable Half Face Masks 7500 Series have a bayonet-style twin-filter design that fits a broad range of 3M lightweight filters. Our 7500 Series reusable masks have a 3M™ Cool Flow™ Valve, a soft sealing surface for comfort, and a unique head harness with an optional drop-down strap.For a reusable respirator that’s comfortable to wear, use 3M™ Reusab