OPTIFOAM NON-ADHESIVE 4X4OPTIFOAM NON ADHESIVE 4X4 Optifoam Foam Dressings: Optifoam's waterproof, polyurethane backing helps maintain an optimally moist wound environment, helps prevent strike through, and aids in the prevention of bacterial contamination of the wound. Backing's moisture vapor transmission rate adjusts depending on the fluid level in the wound. Foam pad has micropores for low adherence to wound surface, yet has a higher fluid handling capacity than other