Half and full facepieces filter a worker's breathable air in environments with heavy dust, vapors, gas and fumes. Half facepiece respirators cover a worker's nose and mouth. Full facepiece respirators cover the entire face and are used in harsher environments to protect a worker's eyes. They can use filters or cartridges to purify incoming air or they can use an attached hose to deliver oxygen from another source. Half and full facepiece respirators are made of durable materials such as nylon and silicone. Adjustable straps provide a secure, comfortable fit on a worker's head.