This half facepiece was designed with the wearer in mind Its soft sealing surface, along with a uniquely designed, 3M Cool Flow Exhalation Valve, enhances wearer comfort and face fit It's made from a durable silicone and can be used with any of the 3M Filters and Cartridges, Series 2000, 5000, 6000 and 7093, Features and Benefits, New cool flow exhalation valve designed to help make breathing easier; also helps to reduce heat and moisture build up in mask , Durable and heat resistant, made from soft resilient silicone and heat-resistant , New soft seal design; advanced silicone material provides a softer feel on the face , Unique adjustments design helps to reduce tension and pressure points on the face providing unsurpassed comfort and helps reduce ring around the nose , Dual-mode head harness design adjust easily allowing user the option of wearing the respirator in either the traditional, or drop down mode