Designed to cut energy cost, this cover is ideal for any cold weather climate. This cover is built using the highest quality marine grade Vinyl and is 5″ thick at the center and 3″ thick at the edge. Galvanized C-Channel is installed on both sides of hinge for added strength. This cover is rated R-25. The polystyrene foam inserts are heat sealed in seven millimeter plastic. Double thick wrapping of foam inserts is available at an additional charge. Twelve different colors are available.