Build Your Pond with Ease: This 15 ft x 20 ft pond liner combo includes one 45-mil EPDM pond liner and one protective underlayment. It is easy to get started on backyard ponds, landscape ponds, or small ecosystem ponds Thick Protective Underlayment: The pond liner for outdoor ponds comes with a nonwoven fabric underlayment that helps reduce puncture and damage risks. It creates a smooth surface, extending the pond liner’s service life Built for Outdoor Weather: This EPDM pond liner handles sun exposure, rain, snow, and temperature changes without cracking. It stays flexible, reduces water leaks, slows aging, and helps lower the need for frequent refilling or liner replacement Tear-Resistant & Wear-Resistant: With a 45-mil thickness, this EPDM pond liner is built to resist punctures and tearing. Featuring a tear strength of 25 kN/m and tensile strength of 9 MPa, it handles tough outdoor conditions and fits different pond shapes

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