Sundance Optima Replacement Spa Cover and Hot Tub Cover - Charcoal Measures 89 x 89 inches with 8 inch radius corners 4 inch to 2 inch taper with 1 pound foam density and set of 2 keys for locking tie downs Skirt Length: 5 inches, Strap Length: 9 inches NOTE: This cover is NOT compatible with a cover lift which has arms that install/mount directly into the cover. Freight shipment - provide a valid phone number so you can be contacted to schedule delivery