GLI 70-0018RD-BLK-160 Round Armor Shield Floor Pad, 18-Feet This armor shield floor pad provides an important protective layer between a vinyl swimming pool liner and it's sand or soil base Armor shield is a polypropylene geotextile material that prevents cuts and punctures to the vinyl liner caused by rocks, roots, grass and even glass Armor shield also reduces convective heat loss and provides a comfortable floor pad for tired feet Above ground liner is installed with an armor shield floor pad Available in round shape and 18-feet diameter