[Protect Your Winterized Pool] 4x4Ft pool pillows for above ground pools can help you disperse the pressure on the pool wall and covers due to the expansion of the pool by the ice. It also prevents snow, rain or leaves from accumulating in the center of the pool cover to make the pool cover collapse. [High Quality Materials] Our pool pillows for above ground pools is made of 0.3mm thick high-density cold-resistant PVC material and designed with double seams along the edges. It can be used with confidence even in temperatures as low as -10F (-25C). Unlike the general thickness in the market is 0.15mm, easy to air-leaking and cannot last the cold winter. [Easy to Inflate & Deflate] Our winter pool pillow features a unique dual Boston valve: inflate and deflate. It is very easy to use, just use the electric air pump that is commonly used in the family to quickly inflate. Please press the 2-layer lids tightly, remains closed and prevents leakage. Just unscrew to deflate in seconds. [Multiple Uses] Our pool air pillow for above ground pool not only can be used for above-ground swimming pools, but also can be used for protecting your outdoor furniture, fountains and spas during winter by eliminating the level difference of protective cover, avoid damage to outdoor facilities due to the accumulation of rain, snow, and fallen leaves, and help keep your outdoor furniture clean. Colour:Blue Material:PVC Size:4 x 4Ft Package Contents: 2 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.