A solar pool cover is one of the most economical ways to keep your pool warm and extend the swimming season. Often referred to as a solar blanket this cover is designed with thousands of tiny air bubbles which trap heat from the sun and transmit that to the pool water. These solar covers often keep the water temperature 3-8 degrees warmer. They take the heat from the sun during the day and trap it in the water preventing the loss of heat on evenings and cloudy days. Solar covers allow you to swim in warm water even on chilly days and keeps your water levels high reducing evaporation. Get your solar blanket today for a warm swimming pool tomorrow! Details:Blue40ft. x 16ft.Bubble diameter: 12mmBubble height: 3mmIncreases and keeps water temperature 3-8 degrees warmerReduces heat loss up to 75%Reduces evaporation saving water and costly chemicals up to 97%Keeps your pool clean by blocking dirt and debris from waterPlastic/vinylNote: This listing is for the cover only pool not included