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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 covers serve a very useful role. Retaining heat and preventing heat loss are the most important ones. A solar covers will also help raise the water temperature a certain amount, but if you are expecting a solar cover to heat your pool to 90 degrees in March or September, you will be disappointed. You can, however, expect a modest temperature increase with your solar covers.