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Solar Covers heat your pool in two stages: first by absorbing solar energy to heat the pool, and then by retaining the heat to keep the water warmer longer. The small bubbles on the Solar Cover are filled with air that heats up when the cover is in the sun.
Solar pool covers, also called bubble covers or solar blankets, are the least expensive and easiest to handle for pool owners. The air bubbles that cover the surface of most solar pool covers absorb the sun's warmth and transfer it to the cooler pool surface. The cover seals in the heat, preventing it from escaping back into the air. This process is most effective when the sun is shining directly on the water.