420D Waterproof Material: Window air conditioner cover are made of high quality 420D waterproof oxford cloth, with a silver inner layer, better waterproof effect, washable and durable. Suit for Most Standard Size Window AC: Window AC unit cover size is 25.5W * 20.5D* 18H inches (65*53*46cm), suit for most of standard window ac unit 7,000 - 12,000 BTU. Double Straps Design: Outdoor window AC protection cover has two adjustable straps with snap buckle, make the cover not easy being falling due to wind, easy to put on and take off. Isolate Cold Air and Dust: Black window AC cover not only could protect the ac unit from uv, dust, but also could keep your room warm in winter, prevent the dust, rain, snow enter to indoor. Please Note:Please choose the correct size of our product accoring to your air conditioner size. In order to a long time use, we suggest clean it regularly.