High Quality Material: This winter pool air cushion is made of thick, high-density PVC material. The square winter pool cushions are more durable, cold-resistant, and reusable to protect your pool throughout the winter. Protect Pool Water: Cold outdoor weather in winter can cause pool water to freeze, and the winter pool air cushions help reduce ice pressure on the pool cover. If the pool cover is supported with a winter pool pillow, it also prevents snow or rain from accumulating in the middle of the pool cover so that it does not collapse. Easier to Inflate and Empty: This winter pool air cushion has a double-sealed design that works perfectly with most pumps for faster inflation and emptying without air loss; The included 5-meter rope can be easily tied to the four corners of the winter pool cushion to make it more stable. Wide Range of Uses: The square winter pool air cushions with good sealing properties can be used not only for different sizes of swimming pools, but also with a