Deluxe Ice Equalizer Air Pillows for pools come in three different sizes. Select size above. The ice equalizer pillows relieve stress from the walls of the swimming pool caused by ice. They also create a 'teepee' on the surface of the cover that helps to reduce the build-up of rain water, leaves and snow. All you have to do is inflate the pillow and place it under the cover during the winter months. Note: Do not overfill the pillow with air, as this can cause the valve to pop out during the winter months.