I bought this for my child to use for swimming, but they've only used it once or twice. I think it's relatively clean! It generates buoyancy and promotes water flow. By eliminating head movement during breathing, it allows for training focused on swimming technique, body position, and form. The cushioned, lightweight, adjustable head bracket (the part that rests on the forehead) provides a comfortable fit. The unique mouthpiece offers a strong hold without needing to bite down hard, making breathing easier. Features a one-way valve.