The Ultra-Twin full-facepiece respirator has an inturned lip around the edge for a secure, comfortable seal against the face. A large chin cup makes it easy to position. Five suspension headstraps and roller buckles hold the facepiece in place while minimizing hair entanglement. The wide poly car bon ate lens is coated to resist scratching and chemical attack. The lens is held in place by a two-piece lens ring which is colour-coded to indicate the size of the facepiece. Uses the full line of threaded cartridges and filters. It includes a speaking diaphragm for clear, short-range communications and a nosecup, to reduce lens fogging in low temperatures or high-humidity conditions.