Polyester Blend Fits evaporative coolers 37"W x 37"D x 45"H Keep your evaporative cooler clean, cool, and dry with this heavy-duty cover Durable polyester fabrics have been treated with water-resistant and water-repellent coatings for all-weather protection Designed with vents, this cover will help to reduce condensation under the cover, as well as wind lofting Designed with vents, this cover will help to reduce condensation under the cover, as well as wind lofting An adjustable cord and rip-n-grip tabs provide a secure, customizable fit Not for use when the cooler is in operation