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! Product Features:. Round blue swimming pool solar cover. Increases and keeps water temperature 3-8 degrees warmer. Reduces heat loss up to 75%. Reduces evaporation, saving water and costly up to 97%. Extends swimming season by up to 6 weeks. Keeps your pool clean by blocking dirt and debris from water. Can be used in both swimming pools and spas. Bubble diameter: 12mm. Bubble height: 3mm Dimensions: 6.25' diameter. Material(s): plastic/vinyl Note: This listing is for the cover only, pool not included