While youre hiking in the desert, boating under a noon sun, and playing on the beach in mid-summer, your pup is panting away in a desperate attempt to stay cool. Outfit your dog in Ruffwears Swamp Cooler. The Ruffwear Swamp Cooler has a three-layer constructionthe top air-mesh layer releases heat, the middle layer absorbs and stores cooling water, and the bottom layer uses the water to cool your dog. An auto-lock buckle adjusts around your pups torso. Measure around the widest part of the rib cage, and choose a larger coat for more coverage if your pup is between sizes.