The air pillow is the ultimate companion to any winter pool cover. This air pillow will keep your pool and cover safe from ice in the winter months because it helps to keep water off of your pool cover. The pillow pushes your pool cover up off the water's surface so the water won't freeze to your pool cover, helping to prevent damage to your pool cover during the cold off-season. Keep water off the top of your pool cover and prolong your cover's lifespan with the air pillow. We are an authorized Swimline swimming pool parts dealer!