EverGuard Vent Boots are molded from a proprietary PVC formulation engineered to work with EverGuard PVC single-ply membranes. EverGuard® PVC single-ply roofing system molded accessories provide roofing contractors an easy-to-install, factory-built detail. EverGuard® molded accessories are manufactured using a proprietary formulation designed for use with GAF's EverGuard® PVC single-ply membranes.