Smartline® 15' x 48 Wall Height Round UniBead Above Ground Swimming Pool Liner - 25 Gauge Whether installing a liner for the first time or replacing an existing liner, the SmartLine® Overlap Liner 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. Liner Type: Unibead Pool Type: Above Ground steel wall pool (liner will not fit Intex, Coleman, Bestway or any soft-sided pool) Design: Choose from the drop-down menu Material: 100% Virgin Vinyl UniBead Connection - Unibead Liners are used for a J-Hook-type installation, as they hook over the top of the pool wall. Unibead Liners are Universal, as they can also be installed as Beaded, or can be used as a replacement for an overlap Liner. Extra Heavy Duty: 100% virgin vinyl material protected against chemicals and UV fading Best cold crack resistance in the industry Features of the Liner: High-temperature curing, computer-controlled process ensures that 100% of the material is "Vulcanized" to the highest possible tolerances Vacuum Sealed, high-volume air pumps combined with electronic air filters remove all impurities before bonding High-pressure heat bonding, computer balanced combination of high pressure and exact temperatures insures a void-free permanent bond The most technically advanced radio frequency vinyl welding reduces the chance of cold spots in the seaming process Reduced wrinkling! Hand-folded flat, to reduce wrinkles, unlike automated packers that twist and force the liner into the box which can cause permanent creasing. Most Common Types of Liners: UniBead: Unibead Liners are used for a J-Hook-type installation, as they hook over the top of the pool wall. Unibead Liners are Universal, as they can also be installed as Beaded, or can be used as a replacement for an overlap Liner. This information is intended to answer any questions you may have regarding the type and size liner you may need. We cannot be held responsible if you purchase the wrong size, shape, depth, or type of liner. The best way to make sure you are getting the right liner is to email us with any questions. Limited Warranty: 25 Gauge = 25 Years (Note the warranty is for product replacement only based on defective workmanship or materials.) Note: Once the liner has been taken out of the box, the liner is non-returnable unless the liner is defective, received damaged, or miscut by the manufacturer. Please make sure you measure your swimming pool twice before purchasing. Lastly, none of our liners will fit Intex, Coleman, Bestway, or any soft-sided swimming pool.