Air Pillow 4'x4' for winter cover

This pillow lets you to protect your above ground pool's walls from damage caused by changing water pressure during the winter months. Installing easily underneath your winter cover, it also prevents leaves, rain, snow and ice from accumulating on top of the cover and collapsing it and eventually tearing it. This pillow is constructed from 16-gauge vinyl and is thick enough to handle freezing temperatures with ease, and resists leaks better than less expensive alternatives.