This premium overlap Sunlight Oval Overlap Pool Liner (15 x 25 ) is constructed of heavy-gauge vinyl so it will continue to last and last maintaining its beautiful appearance for years. The gorgeous design on this cover imitates the peaceful and entrancing optical effect of light refracted through water. The unique Lamiclear process used to preserve this opal pool liner provides maximum protection from pool chemicals and the sun s damaging UV rays. Strong double-welded seams will withstand winter s worst.