The innovative Ruff Wear Swamp Cooler provides your dog with on-the-go 'air-conditioning' in hot and humid conditions. Available in multiple sizes, it allows active dogs of all shapes and sizes to safely brave the summer heat. The vest offers UPF 50+ sun protection and utilizes evaporative cooling technology to keep your dog from overheating. Simply soak it with cold water, wring out the excess, and put it on your four-legged friend. The top layer consists of abrasion-resistant and reflective air-mesh that generates evaporation and releases excess heat. A middle layer absorbs and stores the cooling water so the bottom polyester mesh lining layer that rests against your dog's body continues to offer a cooling effect. Once enough time has elapsed under the hot sun to decrease the moisture, just add more cold water and off you go. Side-release buckles make it easy to put the vest on and take it off. Built-in adjustability allows you to dial in the fit. A leash pass-through allows your dog to wear the vest with a harness (sold separately). Reflective trim provides visibility, and an integrated light loop is ideal for attaching The Beacon safety light (also sold separately). The Ruff Wear Swamp Cooler is available in an array of sizes. Please reference the Size Chart for Ruff Wear's measurement instructions and suggested fit.