Extend Swimming Time: The 12 mil solar pool cover with thousands of thermal bubbles During the day, this cover can trap the heat from the sun and heat the pool up under the full sunlight.. 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! Reduces Water & Chemical Evaporation: The solar pool cover creates a barrier that minimizes water and chemical evaporation, keeping your pool cleaner for longer and cutting down maintenance costs. Protect Your Pool: Secure your pool from dust, leaves, debris, and animal. Our solar pool cover provides the ultimate protection.