Teton liner is based on EPDM synthetic rubber, a highly flexible stable material. Teton liner is specially formulated to be safe for exposure to fish and plant life in decorative ponds. It can easily be shaped to fit the unique contours of any pond. Teton pond liner shows outstanding resistance to the harmful effects of ultraviolet radiation (UV), ozone and other environmental conditions. It requires little or no regular maintenance once installed. Teton pond liner also has a 20 year manufacture warranty.