The Extra Heavy-Duty Space Age 18-Foot Round Round Solar Cover Pool Blanket warms up your pool water by over 15 degrees.

Made of polyethylene material, this solar cover floats bubble side down on the surface of your pool water when the pool is not in use, allowing solar energy to pass through and trap it as retained heat in the pool.

This cover is made of Extra Heavy Duty 10 mil material that helps raise the water temperature by absorbing sunlight during the day and retaining the heat at night, thereby extending the pool season.