EPDM: Durable and Puncture Resistant, EPDM is very versatile and is used in a wide variety of pond applications, pondless waterfall, skimmers and waterfalls, retention ponds, Koi and fish hatcheries * EPDM (ethylene propylene diene Monomer rubber) remains flexible & pliable in extreme temperatures: ranging from -40F to +175F, Resists Harmful UV Deterioration. 25 Year Warranty & Certified Fish & Wildlife Safe. Made in the USA! * Underlayment: High tensile strength underlayment is easy to shape to your application.High tensile strength underlayment is easy to shape to your application.Provides a stable and lasting foundation for Koi ponds, water gardens and waterfalls. Enhances soils stability and controls erosion, Use inside the water feature to pad large rocks and structures. It can be used in landscape beds and retaining walls too. * Virtually indestructible; unaffected by hydrocarbons, mildew, rot & freeze-thaw cycles. Diffuses gas and fluid build up. Made in the USA! Ships via FedEx Ground Most of the Time or Freight Truck for Our Largest Pieces. Made in the USA! * Ships via Ground Package or Truck Freight. Liftgate Service is not Included