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, or 7093. Maximized comfort in air purifying respirators means not only easy breathing filters and cartridges, but also a soft, comfortable face piece. Half face piece air purifying respirator users can now experience state-of-the-art features that help provide unsurpassed comfort.