UV protection heat protection thermal film reduces water evaporation to help conserve water. The cover leaves a small space at the edge of the swimming pool to allow water to breathe, helping maintain optimal water condition. This thickened folding pool cover fits over the top of the pool to help prevent leaves, dust, and dirt from entering. The swimming pool thermal insulation film uses a PE air cushion layer to retain heat stored in the water, minimizing heat loss during nighttime. The summer sun-resistant pool cover is waterproof and resistant to UV radiation, ensuring durability even after prolonged exposure to sunlight and water. It can be reused season after season. Description: The Round Bubble Cover is made from safe, durable PE material that helps convert ultraviolet light into gentle heat within the swimming pool, reducing reliance on external heating and lowering energy costs. It effectively reduces water evaporation, conserving water and supporting efficient pool maintenance during warm months. It also helps keep your pool cleaner when not in use. Features: - Round Bubble Cover White color - Material: PE - Size: Diameter: 122cm / 48.03 inches / 4ft Note: Due to differences in display screens and lighting, the actual color may vary slightly from the image. Due to manual measurement, please allow a size variation of 13cm. Package includes: 1 Round Bubble Cover