This 45 mil liner is the number one pond grade thickness on the market, unlike others who choose to install with a thinner 34.5 mil. This material is easy to cut if excess is left behind after installation is complete ensuring a clean look and design to your pond. The flexible and UV protectant layer ensures that the liner is made to withstand cold and warm temperatures while creating longevity. This liner is pond ready and is safe to use with fish, plants, and other aquatic life Puncture resistant material helps to ensure that pebbles and other small materials do not easily go through the liner The PondScape EPDM 45 mil rubber liner is leading the pond industry with game changing technology. The 45 mil thickness ensures that small items like pebbles, twigs, and other harmful threats that can create leaks. This liner is professionally graded, and is used by our pond experts themselves. The multiple sizes available makes choosing the right size a breeze. The liner is safe for use with fish, plants, and other aquatic life. Ensure your pond is installed with the best liner in the pond industry.