Instantly create a smooth soft padded wall surface barrier between your pool wall and pool liner. The Gorilla Guard closed-cell 1/8-in thick high-density wall foam provides excellent protection between your pool liner and the pool wall. In addition, it acts as an insulator improving your pool's ability to retain heat. This foam extends the life of your pool and pool liner by providing extra protection from rust, corrosion, and other wall deterioration that may damage your pool or pool liner. Requires spray adhesive for easy installation (not included).