3M Rugged Comfort Quick Latch Half Facepiece Reusable Respirator 6503QL/49492, Large, Gray/Teal Resilient silicone faceseal provides comfort, durability, and stability with a soft but firm seal Quick Latch mechanism makes it easy to drop down the respirator from face without removing head straps Proprietary 3M Cool Flow valve helps reduce heat and moisture to make breathing easier Low profile half facepiece design offers a wide field of view and compatibility with welding and grinding shields Exhalation valve cover directs exhaled breath and moisture downward to reduce fogging of face shields