This underlayment is a heavy (7 oz to the yard) synthetic matting. Our Pond Liner Underlayment comes in 20 x 15 ft roll (300 sq. ft.). It should be placed under the pond liner, when a pond is being installed. Pond Underlayment is a geotextile material used to protect the liner from roots and rocks.
Enter the number of rolls that you wish to purchase in the quantity box then click the 'Add to Cart' button.