<ul> <li>MEASURE TWICE, BUY ONCE Whether installing for the first time, or replacing an existing liner, the Rock Island pattern offers durability while not breaking the bank. Be sure to check the measurements of your swimming pool to assure the correct size is purchased. Pool height is determined by measuring the outside wall from the ground to underneath the top rail.</li> <li>PRETTY PLEASING PATTERN - The Rock Island liner print featured large blue, gray and brown river rocks complementing the smaller blue pebbles that reside below along your pool walls and floor. The North American cut material is hand-folded to prevent permanent creasing and excess wrinkling. Before installing, lay the liner out in the sun for a minimum of one hour to warm up the vinyl ensuring it is able to stretch when adding water.<p></p></li> <li>STAY COOL IN THE POOL Enjoy the warm weather while spending quality time with family and friends. Your backyard aboveground pool will surely become the place to be during those hot summer days. Stay cool in more ways than one with the Rock Island liner.<p></p></li> </ul>