UV Protection: The swimming pool liner prevents ultraviolet radiation. Durable in Use: The waterproof swimming pool cover cloth can extend the life of the swimming pool and make the swimming pool more durable. Multiple Uses: These pool covers fit perfectly over the pool and prevent dead leaves, dust and debris from accumulating in the pool. Pool Cover: Reduces the evaporation of the swimming pool water and lowers the temperature and air of the interior and prolongs the effect of the medicine. Insulation Film: The swimming pool insulation film saves a lot of costs for heating the swimming pool water.