Polyester Fits double 30/7.5 gallon tanks (Model 3) Three-year limited warranty Heavy duty water-resistant, wipe clean vinyl with a soft, non scratch backing is both UV and mildew resistant Protects against dirt, grease, rust and harmful UV rays Board insert for additional stiffness across the top of double tanks Zip-open front for fast access to valves Sized to fit all popular LP tanks Durable fabric provides protection from harmful UV rays