Vevor Pond Liner 15 x 15 ft with Underlayment Leakproof 45 Mil Thickness NewThis pond liner and underlayment combo is designed for outdoor ponds, water gardens, waterfalls, fishponds, and fountains. It includes a 45 mil EPDM rubber pond liner with a non woven fabric underlayment to help reduce punctures and extend service life. The material is built to stay flexible through changing outdoor weather while helping minimize leaks. Its tear resistant construction makes it suitable for a variety of pond shapes and backyard