This is a 15' x 300' Roll of Geo-Cushion.

Geo-Cushion is an 1/8" thick (approximate) pad that is placed on the ground before your pond liner is installed. It acts as a barrier to protect your pond liner against punctures from rough surfaces on the ground (rocks, dirt clods, sticks, etc.) NOTE: You should make every effort to prepare the ground to reduce/eliminate all sharp objects before installing any pond liner (with or without the use of an underlayment).