Bestway 8ft Fast Solar Pool Cover prevents debris from falling in an 8ft Fast Set pool and uses the sun’s solar energy to heat the water. The solar cover floats on top of the water when a pool isn’t being used. Its design is similar to bubble wrap used for packing, trapping heat inside a pool to keep it insulated. The cover can also absorb sunlight to heat the water. Other benefits of the cover are that it reduces evaporation to save on water costs and, because it blocks out dirt and grime, can reduce the need for water cleansing chemicals. The solar cover’s air bubbles can keep a pool insulated even when the sunny season has finished, prolonging the use of a pool for weeks or even months after. Adult supervision required when children are in and around pools and water. This is NOT a safety cover.