3M Full Facepiece Reusable Respirator 6900DIN, Respiratory Protection, Large Large lens provides a wide field of view for excellent visibility Lightweight well-balanced design and silicone faceseal for enhanced comfort, durability and ease of cleaning Available in air-purifying, supplied air, and powered air purifying respirator modes Center adapter directs exhaled breath downward 3M Cool Flow Valve makes breathing easier to provide cool, dry comfort