Waterproof dressings are transparent film dressings comprised of Polyurethane (PU) film coated with adhesive. They offer a transparent, waterproof film layer that serves as a bacterial barrier.

Although the dressings do repel water they are still porous and thus breathable. This aids in providing an environment that is moist, leading to faster healing. They are ideal for the protection of wounds as they seal out water, dirt and germs; therefore decreasing the chances of infection.