[Designed to Withstand Ccold Winter Temps]Pool Pillows for Above Ground Pools is made from ultra-strong, Super , 0.24mm thick, cold-resistant PVC material. Designed to withstand temperatures, this pool pillow will cope with the cold as bad as 10 F (25 C). [ Pool Winter Pillow Size]: 4' x 4' Pool Pillows for Above Ground Pools is built to withstand cold winter temps, it's designed to displace the pressure of ice freezing to help protect your pool walls. [ Easy to Inflate & Deflate]: Our pool winter pillow features a unique, dual Boston valve, allows 10x faster inflation and deflation compared to traditional valves. Works seamlessly with most blower. Foldable , easily roll it up to storage. [Protection For Your Pool All Winter]Pool Winterizing Pillow with sealing technique and embossed, cold-resistant material, means that it 't leak, tear, or deflate throughout winter. Inflate the pool pillow to 60-70 % of its full capacity so that, as freezing progresses, the impact of expansion goes to squeezing the pillow instead of into the walls. It can protects above-ground pool walls and pool covers from pressure caused by expanding ice. [Stays in Place ]The pool cover pillow designed with 4 reinforced grommets at corners to keep the pool pillow in position at the center of the pool -Just slip the included 2x16.5 feet rope through and tie the pool pillow to your pool. color: blue Material: PVC Package Contents: 1 x Pool Pillows 2 x rope Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.