. The Space Age’4R* Solar Blanket collects heat from the sun's rays similar to a traditional blanket. Otherwise lost heat is reflected back into the pool from the special Aluminium underside. Our durable above-ground blankets can warm your pool this year by up to 15F. Our blankets are made to give you maximum heating properties combined with long life. Our 8-mil blankets are loaded with thermal bubbles that retain heat at night and on cool cloudy days. Our transparent blue color allows the maximum amount of solar rays to reach you pool for optimal heating.