Pond Underlayment Liner Protection Mat 6.25‘ x 360’ Bulk

6 oz-per-square-yard black polypropylene, nonwoven fabric. Use under pond liner to protect it from sharp or abrasive objects in the ground, and increase puncture resistance from within the pond. For additional protection, it may also be used inside the pond under rocks and boulders. Sold in full rolls by the linear foot.