3M Reusable Full Face Mask Respirator 6900 Unique center adapter to direct exhaled breath and moisture downward, helps reduce debris Large lens for wide field of view and excellent visibility 3mtm cool flowtm valve for cooler, drier comfort Lightweight, well-balanced design with silicone faceseal for enhanced comfort and durability Air purifying respirator (apr), supplied air (sa) and powered air purifying respirator (papr) modes