The most popular type of swimming pool cover sold in the UK is the solar pool cover. This bubble type solar blanket is designed for use on outdoor pools to maximize the benefits of free solar energy. These solar pool covers harness the energy of the sun by transmitting the sun"s rays through specially sealed air cells that float on the pool surface which helps raise the temperature of your pool. The insulating quality of the cover helps to prevent heat loss at night when the air temperature cools.