· 3 layers of window ac covers for outside: The window AC cover is made of high density waterproof oxford cloth, insulation EPE foam, high quality aluminum foil. window air conditioner cover can cover and protect the window unit without removing for the winter.· Windproof & Waterproof: Protects from leaves, debris, rain, snow and UV, keeping the cold air from entering in the ac window unit cover from the outside, helping conserve energy in the winter months.· Cuttable Design: The sewing thread at the bottom of the air conditioner cover forms several cutttable areas. If the air conditioner has a bracket, the area can be cut to fit the bracket position.· Metal buckle straps: The air conditioner covers for window units included two straps with metal buckles are sturdy and easy to adjust to ensure a tight fit.· Easy to install: Just put it on, and the straps keep the cover in place. Size: 21.1"L × 15"H × 16"D, Please kindly measure your unit to confirm the size.