GREEN VISTA 12x15 FOOT COMBO - 45 MIL FIRESTONE EPDM POND LINER AND HEAVY DUTY UNDERLAYMENT Provide Durable Waterproof Protection and Over 400% More Puncture Resistance - Safe for Fish and Plants SIMPLY THE BEST: An ideal combination from Green Vista, this pond liner and underlayment are the best sold on Amazon or anywhere else! The Firestone 45 mil EPDM pond liner measures 12 feet by 15 feet and is black. The black, heavy duty pond underlayment also measures 12 feet by 15 feet, making it the perfect size to protect the pond liner. Use them together in a pond, water garden or other waterscape. PREMIUM POND LINER WITH 20 YEAR GUARANTEE: The industry standard for over 20 years now, this Firestone pond liner is the premium liner on the market for the toughest applications! Durable, it is backed by a 20 year guarantee from Firestone. The waterproof liner is 45 mil thick and in a class by itself when compared to cheap PVC and similar economy pond liners sold elsewhere. OVER 400% MORE PROTECTION WITH UNDERLAYMENT: The heavy duty underlayment boosts the puncture resistance of the pond liner by more than 400 percent! The sturdy underlayment serves as padding for the liner, protecting it from the sharp edges of rocks and other objects on the soil surface. It also protects the pond liner from roots and burrowing animals. MADE IN THE USA, PLUS A GENEROUS SIZE: Both 12 feet x 15 feet, this pond liner and underlayment are large enough for a water feature that is 8 feet wide x 11 feet long x 2 feet deep. Both of them can be cut easily to fit a smaller waterscape. The liner and underlayment are products of the United States of America. FISH AND PLANT SAFE: Your koi, other fish and aquatic plants are safe with this pond liner and underlayment. Firestone guarantees the pond liner to be 100 percent safe for fish.