On a warm sunny day, hot dogs will trot for the shade, lie down, and pant the heat away. They need an air-conditioner - a Swamp Cooler™ - to stay cool, happy and active. Don't get beat by the heat. Outfit your dog in a Swamp Cooler™ and let the cooling begin. Features: -Uses evaporative cooling to keep dogs cool in the heat. -Exchanges the dog's heat with the coolness of the stored water. -Releases the heat as the water evaporates. -Light color reflects sunlight and ultraviolet rays for added sun protection. -Autolock buckles adjust and hold for a custom fit. Sizes: -X-Small: 17" - 24". -Small: 23" - 30". -Medium: 27" - 32". -Large: 31" - 40". -X-Large: 35" - 48" . Sizing Information: -All sizes are determined using dog's girth, the measurement around the largest part of the rib cage -In-between sizes: Choose the largercoat for more coverage -Fit: The Swamp Cooler is designed to have a comfort fit for a full range of motion How the Swamp Cooler Works: -Top air-mesh layer generates evaporation, releasing heat. -Middle layer absorbs and stores the cooling water. -Bottom layer cools the dog. How to Activate the Swamp Cooler: