Daisy Solar Cover are designed to be used throughout the swimming season, in assistance with a Daisy roller. Rolled out over your pool when not in use the solar cover will warm the water, trap heat, retain that warmth, stop water loss as well as deliver all the other benefits of solar pool blankets. If used correctly, a Daisy solar cover will add months to the swimming season and you can of course leave this cover on your pool over the non swimming months or extended periods of non-use. A solar cover will assist in keeping your pool cleaner.