NU-DERM Hydrocolloid dressings are specially designed to maintain a moist wound environment. Their top layer is made of semi-permeable polyurethane film and also has bevelled edges all around the product. Such dressings are waterproof and typically stay in place throughout the shower. When in contact with exudate it forms a soft gel that is easily removed together with the dressing and does not damage the newly developed tissue. These dressings are available in various sizes.