The Vevor 25 x 30' pond liner is designed for outdoor ponds, water gardens, waterfalls, and fountains. Its 3-layer construction combines PE outer layers with an HDPE middle layer to help reduce leaks and support long-term use. The 14 mil material is tear-resistant and wear-resistant for demanding pond environments. Four metal buttonholes at the corners help make installation and securing the liner easier. It can also be trimmed to fit a variety of pond shapes and sizes.