The Swimline pool cover pillow is made from durable materials that can withstand outdoor conditions and exposure to water. It's easy to inflate using a pump or by blowing air into it manually. The pillow is available in different sizes to accommodate various pool dimensions and cover sizes. Using a pool cover pillow can extend the life of your pool cover by reducing the risk of damage and prolonging its effectiveness in keeping your pool clean and well-protected during the colder months.