Features 1. THICKENED POOL PILLOW: Pool cover pillow made of cold-resistant material of PVC, the edge of the pillow uses double stitching technology. The double upgrade process ensures that even in cold weather, the pool pillow will not show holes and tears. 2. PROTECT YOUR POOL DURING ALL WINTER: Our pool pillow creates surface tension which effectively protects above-ground pool walls and pool covers from pressure caused by expanding ice. This prevents expanding ice along side your pool walls. 3. GREAT PROTECTION: Air pillow absorbs freezing water as it expands. Relieves above ground pool walls from stress of ice expansion. Helps reduce the build-up of rain, leaves or snow on your winter cover. 4. STAYING IN PLACE: Just slips the included rope through and tie the pool pillow to your pool and the reinforced grommets at corners around the pillow to keep the pillow in position at the center of the pool. 5. INFLATE & DEFLATE EASIER: We chose double fold valve, which allows inflating and deflating much more faster without losing of air. Works seamlessly with most blower. Foldable design, easily roll it up to storage. Specification Material: PVC Color: Blue Size: 4 x 4ft, 120 cm Weight: 430 g, 910 g Pattern: Round, Square Package Include: 1 Winter Pool Pillow