Reduce water evaporation with our 14-mil Solar Blanket for Rectangular In-Ground Pools. To optimize heat retention, this blanket is clear which allows more solar rays to reach the depths of your pool for consistent, natural warmth. Thermal bubbles retain that warmth even after the sun is gone, keeping your pool water warm even on cloudy days and cool nights. This innovative technology can increase your pool’s temperature up to 15 degrees Fahrenheit. Backed by a 6-year warranty, our blankets are designed to withstand years of direct sunlight and harsh conditions.