Pool Mate 1-3749-02 Heavy-Duty 4-foot x 15-foot Winterizing Air Pillow for Above Ground Swimming Pools, 2-Pack
Brand: Pool Mate
Color: Blue
Absorbs stress created by ice build up
Reduces the build-up of rain water, leaves and snow on your cover
Pillow will pop before the ice damages your pool
Simply inflate the pillow and place it under your cover
Do not overfill the pillow with air, as this can cause the valve to pop out during the winter months (1/2 to 3/4 full is recommended)