**Pool Mate 481840R-PM Heavy Duty Swimming Pool Cover - 18' x 40' Rectangle, Durable Green Vinyl - Perfect for Winter Protection & Debris Prevention** （优化说明： 1. 补充了尺寸单位（英尺）和形状（矩形），提高搜索精准度 2. 增加材质（Vinyl）和核心卖点（Durable） 3. 使用场景强调冬季防护和防杂物功能，匹配用户搜索意图 4. 保持品牌名和型号，便于品牌搜索）

The Pool Mate Commercial-Grade Green Winter Pool Cover will protect your pool from winter elements. This is a solid winter pool cover that will not allow water to pass through its material. The Pool Mate Commercial-Grade Green Winter Pool Covers is constructed of commercial-grade polyethylene. All seams are heat sealed for better performance. This cover is constructed with Rip-Shield Technology that will prevent small rips from becoming larger tears. The meadow green topside of this pool cover is coated to prevent UV damage. Please order by your pool size, as the overlap goes beyond the pool size listed. This cover includes a five-foot overlap. Please order a larger size cover if you have steps (or any other irregularity) protruding from your pool. Water tube loops are placed around the perimeter of the pool cover. Water tubes sold separately. Only water tubes should be used to install this pool cover. No other method of installation is recommended. This cover should be able to comfortably float on the pool water without excessive stress. This cover is not meant to be used as a debris cover during the swimming season. This winter pool cover is intended to be used during the off-season. Includes a twenty year warranty.