The Handi-Spa Pad is constructed of durable, weatherproof, high-density polyethylene, offered in grey. Each pad measures 32” x 48” x 2” thick and weighs 15 lbs. The underside of the Handi-Spa Pad is formed with built-in “strength” pockets. It has been tested to withstand 300 pounds of pressure per square foot. This was accomplished by applying a total weight of 7000 pounds over a 21-foot square area.