Our 45 Mil EPDM Patriot Pond Liner remains flexible and pliable in extreme temperatures, ranging from -40F to +175F enabling it to be installed any time of the year. Patriot Liner contains no plasticizers which become brittle with age and can cause cracks or splits in the material. Patriot Pond Liner is durable and puncture resistant, stands up to extreme temperatures, resists harmful UV deterioration and adapts to a wide variety of skimmers. Our patriot EPDM Rubber liner readily accepts pipe and hose penetrations without leaks and is easily seamed. Patriot Pond Liner has been tested and is certified fish safe. EPDM is simply the best product on the market in regards to pond liners. We stand by our product and provide a 25 year warranty to prove it. 45 Mil EPDM Patriot Pond Liner is the choice of Koi enthusiasts, professional pond builders, and the amateur too.