HappyBottom Pool Pad can add years of life to a pool and its liner. Made from a special high density closed cell polyethylene foam, HappyBottom Pool Pad cushions and protects the pool liner. HappyBottom reduces the potential for liner failure due to punctures. It also acts as a barrier to keep corrosion causing elements in the soil away from the metal components of your pool. HappyBottom acts as an insulator under the pool, reducing heat loss to the ground. Reduced heat loss can save energy and extend your swimming season. A smooth, easy to clean bottom and reduced indentations are just a few of the benefits of using HappyBottom Pool Pad. Pool owners love the comfort and luxurious feel HappyBottom provides when it is used under a pool liner. HappyBottom Pool Pad is easy to install. First, roll out sections of pad and cut them one foot longer than the (biggest, if oval) dimension of the pool. Next, seam enough 4 ft. wide sections together with Sure Seam Tape to cover the (smaller if oval) dimension of the pool. Finally, flip pad over so tape is facing the ground and build the entire pool on top of the pad. Trim off excess pad material after pool has been filled. HappyBottom is available in standard 1/4" thickness and extra-thick 1/2".