Product Features: Designed to protect your evaporative cooler from rust, corrosion, water damage and mildew. Each evaporative cooler cover is made from a durable, long-lasting canvas material designed to perfectly fit your cooler and give you many years of protection from the elements. Each cover includes a draw rope at the bottom to securely tighten the cover around the cooler. When the cover is made, the manufacturer adds a couple of inches all around to account for shrinking and minor cooler-size variations, which will ensure that the cover will maintain the proper size for your cooler through the years. Oversized to allow for shrinkage and external cabinet features