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Shop 12' x 21' oval winter pool covers designed to help protect above-ground pools during the off-season. These covers help shield pool water from leaves, dirt, debris, and harsh winter conditions while making spring cleanup easier. Available in multiple warranty levels and cover constructions, our 12' x 21' oval pool covers are sized to provide the extra material needed for proper overlap and secure seasonal installation. Choose the winter cover that best fits your pool and protection needs, and pair it with helpful winterizing accessories such as air pillows, cables, winches, and winter chemicals for a more complete pool-closing setup.