Diameter: 0 in Size: 118.1" x 78.7" Extend you swimming season with our solar pool cover! This solar pool cover sits directly on the water surface, inside your pools edges; and can thereby raise the temperature of your pool water by up to 1C, depending on the amount of direct sunshine. With PE bubbles all over its surface, the heat is contained much longer. It is the least expensive way to heat your swimming pool. At the same time, it helps reduce chemical consumption, as well as water evaporation. Featuring lightweight yet durable, it can be easily tailored to fit smaller sized pools. Color: Black Size: 118.1" x 78.7" (L x W) Material: PE (polyethylene) with air chambers California Proposition 65 WARNING: California's Proposition 65