Heavy Duty Pond Liner Underlayment- 105 Square Feet Pkg 415% MORE PUNCTURE RESISTANCE: The Green Vista Heavy Duty Pond Liner Underlayment provides superb protection and padding for pond liner. Underlayment increases a pond liner's puncture resistance by 415 percent compared to pond liner used alone. This black underlayment measures 7 feet x 15 feet for a total coverage area of 105 square feet. PROTECTION FROM SHARP OBJECTS: This strong underlayment mat safeguards your pond liner against tears caused by sharp rocks, glass and other debris on the ground's surface. Simply place the underlayment between the ground and your pond liner. PROTECTION FROM ANIMALS: The hefty underlayment fabric also guards against burrowing animals. Without underlayment's protection, pond liner may be torn by animals clawing through the soil below a pond. EASY TO USE FOR ALL PONDS: Lightweight and simple to install, this underlayment is effective for all kinds of water features. Use it for ponds, water gardens and other waterscapes, including those with fish and aquatic plants. SAFE FOR FISH AND PLANTS: Koi, other kinds of fish and aquatic plants are safe with this underlayment.