Firestone / Elevate PondGard 45 mil EPDM Liner is the ideal membrane for lining ponds, pondless waterfalls, water gardens and other water features. Firestone PondGard liner leads the industry in quality and reliability, making it the ideal choice for discriminating pond owners and professionals. Backed by an industry-leading 20-Year guarantee, the 45 mil (1.1 mm) thickness provides superior durability while maintaining the ability to stretch for ease of installation. Firestone PondGard pond liner has an exceptional resistance to solar UV, ozone, and oxidation, providing years of trouble-free use. It is easy to seam 2 or more pieces of liner together and also easy patch if needed. It is available in widths to 50′ wide and lengths up to 100′ long