3M Rugged Comfort Half Facepiece Reusable Respirator 6501, NIOSH, Cool Flow Valve Helps Reduce Heat and Moisture, Silicone Faceseal Provides a Firm Seal, Welding, Sanding, Cleaning, Grinding Size:Medium This brightness memory function is

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3M Rugged Comfort Half Facepiece Reusable Respirator 6501, NIOSH, Cool Flow Valve Helps Reduce Heat and Moisture, Silicone Faceseal Provides a Firm Seal, Welding, Sanding, Cleaning, Grinding Size:Medium This brightness memory function isNIOSH APPROVED: NIOSH, a USA federal government regulatory agency, has tested and approved the 6501 with 3M cartridges, filters or supplied air systems to help reduce inhaling certain airborne contaminants RESILIENT TEXTURED SILICONE FACESEAL: Helps provide comfort, durability, and stability with a soft but firm seal. Keeps its shape even in hot work conditions PROPRIETARY COOL FLOW VALVE: Helps reduce heat and moisture. The exhalation valve cover