4 Sizes AvailableWe understand that every air conditioner has different dimensions, so we offer this window unit AC cover in 4 sizes, they are 17W x 12D x 13H inches, 22.5W x 18 D x 20.5H inches, 21W x 15.7D x 15H inches, and 27.5W x 22.5D x 18.5H inches.Resistant to Severe WeatherDon't let unpredictable weather damage your expensive air conditioning system! This window air conditioner cover acts as a shield against rain, snow, sun exposure, dust, fallen leaves, and more. By using this protective barrier seasonally, you can extend the lifespan of your AC while ensuring it operates at peak efficiency throughout the year.3-Layer Insulation Protection This outdoor waterproof air conditioner cover is designed with three layers of material, the outermost layer of 420D Oxford cloth, the middle layer of 2mm thick EPE foam, and the innermost layer of aluminum foil material. Compared to the common thin material on the market, our 3-layer insulation is thicker and provides better heat retention. It will ensure that your air conditioning system is protected from cold winter weather, rain, and snow.Waterproof and DurableThe outer layer of this window AC cover is made from durable 420D Oxford cloth that is not only waterproof but also resistant to tearing and fading. This means you can trust that your air conditioner will remain protected even during the harshest weather conditions.Elastic Drawstring and Metal Buckle FixationWorried about strong winds and heavy storms damaging your air conditioner? This outside air conditioner cover uses a combination of both elastic drawstrings and 2pcs metal buckle straps to secure your air conditioner tightly, no matter how fickle nature gets. We use zinc alloy buckles, which are stronger and more durable than plastic buckles.