EPDM pond liners flexibility provides more versatility in the pond design. Unlike preformed shells, it can be easily shaped to fit the unique contours of the pond dimensions, allowing a more unique design. Flexible in temperatures from -40 Fahrenheit to 175 Fahrenheit making it easy to install year round. Unlike other liner materials, EPDM Pond Liners do not contain plasticizers that could make it become brittle with age and cause cracks or splits in the material, threatening aquatic life. Requires little or no regular maintenance once installed. Remarkable resistance to the harmful effects of ultraviolet radiation (UV), ozone and other environmental conditions.