Lightweight but thick core density for best insulation. Will try and weigh it soon. His is our original receipt. Measurement #2 (will be broken for fold). Core density: 1.5 lb density. Choose flap length:: 4 skirt/flap. Locking tie-downs: (4) standard locations. Double vapor barrier, clear guard system.The item “NEARLY BRAND NEW HOT TUB COVER” is in sale since Saturday, November 30, 2013. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs”. The seller is “svalentine*” and is located in Union, Washington. This item can only be shipped to United States.