This half face piece 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 durable silicone and can be used with all of our 3M filters and cartridges. Maximized comfort in air purifying respirators means not only easy breathing filters and cartridges, but also a soft comfortable face piece. Half face piece respirator users can now experience state-of-the-art features that help provide unsurpassed comfort with this reusable unit. Pre-filter, retainers (to hold in pre-filter), and cartridges not included.