3M 8511 Respirator, N95, Cool Flow Valve (10-Pack or 80-Pack)Niosh approved N95 for at least 95 percent filtration efficiency against certain non oil based particles and aerosols 3M cool flow valve helps reduce heat build up inside the respirator Breathe 30 percentage easier compared to 3M 8200, breathe easier is defined as initial pressure drop ADJUSTABLE M NOSECLIP helps ensure a custom, secure seal with fewer pressure points STRETCHABLE, BRAIDED HEADBANDS for comfort LIGHTWEIGHT DESIGN for comfort