Every Sharkline pool comes with a Sharkline liner. Sharkline liners are only made for Sharkline pools ensuring a perfect fit. We use 100% Virgin Vinyl manufactured with special formulations to withstand everything from intense sunlight to freezing temperatures. These formulations allow the liner to last and look new longer. At Sharkline we warrantee not only manufacturer’s defects, but the actual quality of the vinyl itself. You won’t find a stronger warranty than that.