A pool pillow is also known as an “Ice Compensator”. Just as the technical name implies, it compensates for the ice that will form on your pool cover in the wintertime and is used in off-season periods in areas where there are subfreezing conditions. Snow and rain will land on your pool cover and freeze. As the ice accumulates it will act like a glacier and expand outward towards the sides of your pool. If too much ice forms it can damage your pool walls. Guess what???? No such freeze in South Texas!!