Indoor Air Conditioner Cover protects your window unit through winter months.Washable cover with beige polyester/cotton quilting has foam liner. Weatherseal keeps out drafts. Specify size for Indoor A/C Cover: Small (12 - 15" high, 18 - 21" wide); Medium (15 - 17" high, 22 - 25" wide); Large (18 - 20" high, 26 - 28" wide).