Allevyn Non-Adhesive dressings have a unique tri-laminate structure made up from a non-adherent perforated polyurethane wound contact layer, and an outer film layer which is both bacteria-proof and water-proof. Helps create and maintain a moist wound environment. Allevyn dressings are non-adhesive and are therefore recommended for wounds surrounded by sensitive skin, such as venous ulcers. The lack of adhesive allows the use of the most suitable retention method, for example, tape onto intact skin, appropriate bandaging or a film dressing such as OpSite*.