An oxygen mask is used with a concentrator in order to fill the lungs of those in need of oxygen. This medical product can be made of plastic, silicone, or rubber and comes equipped with a tube that is responsible for supplying individuals with oxygen. Oxygen masks do not deliver oxygen directly into the nasal cavity as is the case with cannulas, instead fitting over the mouth and nose. Masks can offer users some benefits, starting with cutting back on the dryness that can come with oxygen flow. Masks typically have an over-the-ear wrap that can be adjusted to fit the head comfortably.