Fleece-reinforced PVC membranes that offer superior durability and reflectivity. In addition to reinforced FleeceBACK PVC membranes, Carlisle also offers FleeceBACK PVC membranes featuring Dupont's® Elvaloy KEE (Ketone Ethylene Ester) copolymer, resulting in the most dependable PVC membrane in the industry. Both of these membranes can be installed over a variety of existing roof systems and deck types.