The Funsicle 18ft Solar Pool Cover is essential for maintaining pool water quality while keeping your water warmer. With its additional layer of durable materials, it effectively prevents heat from escaping the pool, which increases the water temperature by 8 degrees Fahrenheit. Just like a conventional pool cover, it also keeps leaves, insects and other debris out of your pool. This cover is compatible with any round Funsicle 18ft above ground pool. Great for cooler weather, you can enjoy debris-free, warm water every time you take a dip.