Polar Vortex Supreme 18 ft. Round Above-Ground Winter Pool Cover is a solid navy winter cover sized for a 18 ft. round above-ground pool. It helps block leaves, debris, and sunlight during the off-season while its reinforced perimeter and metal grommets support secure installation.Why choose a Polar Vortex Supreme cover? Solid winter cover helps keep leaves and debris out of the pool Reinforced perimeter helps resist stress around the cover edge Metal grommets around the perimeter Approximately 4 feet of additional cover material for winter installation Navy cover color What is included?One Polar Vortex Supreme winter pool cover, vinyl-coated cable, and metal winch for securing the cover around the pool.Measure before orderingOrder by the pool’s actual inside dimensions—not by the cover dimensions. Confirm the pool is 18 ft. and round. The additional material provides installation overlap around the pool wall.Important: This is a winter debris cover, not a safety cover. Do not walk on the cover or allow children or pets onto it. Follow proper winter-cover installation and standing-water removal procedures.Winter pool cover help in Peabody, MassachusettsUnsure about your pool size or closing setup? Visit Budget Pools in Peabody. Our team helps North Shore pool owners confirm pool dimensions, choose compatible winter-closing accessories, and prepare their pools for New England weather.