Protect your above-ground pool from winter damage with our durable pool cover air pillow, available in multiple sizes: 4 ft. x 15 ft., 4 ft. x 8 ft., 4 ft. x 8 ft. (2-pack), 4 ft. x 4 ft., 4 ft. x 4 ft. (2-pack), and 4 ft. x 4 ft. round. Designed to absorb the expansion pressure of freezing water, this pool pillow prevents pool walls from cracking while reducing debris buildup. Made of extra-durable 0.4mm thick PVC-nearly three times thicker than standard options-this winterizing pillow resists leaks, tears, and deflation with patent-pending double-sealing embossing technology. Built for extreme weather, it withstands temperatures from −10°F to 180°F for reliable winter protection. The pool pillow features a dual Boston valve for quick inflation and reinforced grommets with a 50-foot rope for secure centering. As part of our Premium Sapphire Series, it meets USA-CPSIA safety standards, ensuring it is free from harmful chemicals and dangerous metals. Keep your pool safe, clean, and well-maintained all winter long with this essential winterization solution. Color: Blue.