Towallmark Rectangle Pool Solar Cover 20ft x 40ft. Keeps our Pool Warm and Clean. Reduces water evaporation by more than. Keeps pool water warm so kids can start playing sooner. Safely isolates leaves and pets. This pool cover is designed with a 200-micron bubble thickness and is easy to roll up. Swim Sooner and Longer: Our pool solar cover helps to keep the water temperature warm, so you can start swimming sooner and enjoy your pool for longer periods of time. Experiments have shown that the lower the environmental temperature, the more significant the insulation effect, which can maintain the water temperature at 1.8? Keep Your Pool Clean: Our pool protection cover provides a safe and secure way to keep leaf litter and pets out of your pool, so you can enjoy a clean and hygienic swimming experience. And Long-lasting: Made from high-quality international standard high material LDPE, with bubble thickness of 300um, which suitable for pool winding. Our pool protection cover is designed to withstand harsh weather conditions and UV radiation, ensuring that it lasts for years to come. Perfect Fit for Your Pool: This pool protection cover can be easily trimmed to fit your unique pool shape, ensuring a perfect fit and maximum coverage.