Winado 12 Mil 18X36 Ft. Blue Rectangle Solar Pool Cover

This solar pool cover is crafted from a specialized material. Its surface uses countless tiny air cells to collect heat from the sun during the day and then transfers that warmth into the pool water, helping to extend your swimming season. Enjoy a more pleasant swimming experience. Note: Place the cover with the bubble side facing down. Due to thermal expansion and contraction, the bubbles may appear slightly deflated before being exposed to sunlight.