Maximized comfort in air purifying respirators means not only easy breathing filters and cartridges, but also a soft comfortable face piece made from a durable silicone . Half face piece air purifying respirator users can now experience state-of-the-art features.The 3M Bayonet Filter Fixing System. This versatile system is suitable for many situations. It provides filtering protection against particulates, many gases and vapors. Positive locking: Sound, safe locking mechanism between mask and filters. Durable seal even after extensive use.