Blue Wave Blue Wave 4-ft x 4-ft Air Pillow for Above Ground Pool

Size:4-Foot x 4-Foot This rugged 16-gauge vinyl pillow absorbs freezing water's pressure and helps protect your pool walls. The Air Pillow also reduces excess rain, snow, and leaves on your winter cover. Excessive amounts of water on the pool cover may create pressure on the pillow, causing leakage over time. it should not be over inflated