The Polarshield Pro Strength 30' x 50' Rectangle Pool Cover is made of extra strong polyethylene sheeting woven with thick polyethylene stitching, which provides superior strength and durability. The winter cover is treated to provide maximum resistance to damaging ultraviolet rays to inhibit deterioration and increase longevity. Adding a Pro Strength in-ground winter pool cover will protect your pool from the harsher elements of winter and keeps debris, algae and bacteria out of the water, minimizing maintenance when re-opening the pool in spring. Protect your pool to ensure years of backyard memories and family fun
