The two-way valve solves the air leakage problem of traditional pool pillows: the two-way valve makes it easier to inflate and deflate, can inflate and deflate faster without losing air, works perfectly with most pumps, foldable design, convenient storage. Prevent fallen leaves and dust from falling into the pool: this 1.2m winter pool pillow is made of high-quality PVC material, super durable and cold-resistant, excellent protection and helps the pool withstand extreme climates. Effectively protects the pool wall and pool cover: the pool pillow can generate surface tension, protect your pool in winter and effectively prevent the pool from being damaged after the water in the middle of the pool cover freezes. It provides sufficient protection for swimming pools in winter and summer: the air cushion absorbs frozen water when it expands, reducing the expansion pressure from ice above the above-ground pool wall and reducing the accumulation of snow, rain and leaves on the pool cover in winter. Sealed and durable: The sealed pool pillows maintain air circulation throughout the season, no leakage, high-quality PVC material, protects the pool and outdoor hot tub from the pressure caused by the expansion of ice and snow, and does not fade after long-term outdoor use.