Harness the Power of Sun: The 16 mil solar pool cover with thousands of thermal bubbles can trap the heat from the sun. This cover can heat the pool up under the full sunlight in summer. And hold the temperature on cloudy days or at chilly nights. Maximize Heat Retention: our pool cover traps and maintains the heat within your pool. Enjoy a warm swim, regardless of the weather condition! Jump into the pool with confidence, Let your friends know that BigXwell keeps the warm for you Trim to Fit: Suitable for inground or above-ground pool. PE material cover is durable but easy to be cut with scissors.