Stratasorb Composite Adhesive Island Wound Dressings, 6" x 6", 100/CS (MSC3066) Case of 100Waterproof composite dressings have four distinct layers for versatile use, including as a primary orsecondary dressing Layer 1 is a nonadherent contact layer that protects the wound site and will > Layer 3 is a nonwoven backing with an adhesive border to securely hold the dressing in place Layer 4 is a semiocclusive, waterproof polyurethane film that helps deter external contaminants andmaintain an optimal wound environment