[ Material]This winterizing pool pillows are made of PVC, a cold 0.3mm thick material that is strong and thick enough to resist tearing by ice, even in temperatures as low as -10 F (-25 C). prevents air leaks and protects your pool all winter long. [Easy to Inflate]Our freeze-proof winter air cushion is easy to inflate and deflate. Simply use a household air pump to inflate the pillow (we recommend only inflating it to about 70%, too much air too little expansion may exploding air pillow, which allows room for expanding ice and prevents damage to the pool pillow) and then the pool pillow to the centre of the pool with a string [Protect Your Pool]During the cold winter months when there is ice or rain or snow, our pool air cushion can help the pool to share the pressure, and avoid the pressure caused by the expansion of the pool ice on the pool wall and pool cover. [Packing Details]You will receive 1 x Winter Pool Pillow, Inflatable Pillow measuring 4 x 4 ft, 2 Repair Patches to prevent damage to the Winter Pool Pillow, and comes with a rope measuring 49 ft, You can freely cut the ropes to a length that fits your above-ground pool to provide easy centering. When not in use, please vent the air in the valve for folding and storage. [Wide Application]The swimming pool cover accessories Ideal for overwintering the pool and when you are away on vacation! Suitable for above ground pools, such as round, oval, rectangular pools, etc., to avoid rain and snow from accumulating on the cover and causing it to collapse. Can also be used for winter protection in spas, outdoor fountains, furniture covers, etc.