ALLEVYN Compression dressings contain a highly absorbent material embedded in a self-adherent polyurethane matrix. The dressing is covered with a waterproof polyurethane film which is permeable to oxygen and water vapor and is bacteriaproof. ALLEVYN Compression dressings employ all the proven benefits of a moist wound environment without any breakdown of the dressing caused by contact with exudate. Features: Non-adherent to wound surface, Highly-Absorbent, Maintains absorption under compression, Promotes and maintains moist wound environment, Easy to use.