The masks can be worn in situations where a temporary mouthguard appears to be useful — for example, when working with others. The masks are injection molded from a medical grade TPE material and are adapted to the shape of the face in the mouth/nose area. Due to their design, Poppelmann masks fit more closely than mouthguard made of fabric. Depending on availability, various materials can be used as filter, such as the standard fleece supplied with the product or, for example, paper handkerchiefs, cotton fabrics and other suitable materials — the higher the quality, the better! All filter material should be replaced after use.