420D Waterproof material: The window air conditioner cover is made of high quality 420D waterproof oxford cloth, with silver inner layer, better waterproof effect, washable and durable.Please choose the correct size: Window AC unit cover size is 25W*21D*17inch, suit for most standard 7000-12000 BTU window AC units.Double Straps Design: The exterior window AC protection cover has two adjustable straps with snap buckle, which makes the cover not easy to fall off due to wind, easy to put on and take off.Isolate cold air and dust: The black window air conditioning cover could not only protect the air conditioning unit from UV, dust, but also could keep your room warm in winter, prevent dust, rain and snow from entering the air. interior.Note: Please choose our product corresponding to the size of your air conditioner. In order to use it for a long time, we suggest you clean it regularly.