Thus cover is fantastic! The first time we took it off, I put my hand in. It was steaming and hot! We couldn't believe it! We had to get in and stir the water then it was perfect. Our water stays around 93. 91 in the late evening! Also it tells you to cut it down to fit into the pool but we left it original size. This way it keeps bugs to the bare minimum and no leaves. Absolutely worth it!