Ruffwear Swamp Cooler Dog Cooling Neck Gaiter - X-Large - Blue/Purple - The Swamp Cooler Neck Gaiter is a reversible, everyday cooling neck gaiter for dogs that's designed to take the edge off when exploring in hot and dry weather conditions. It's an easy way to bring a bit of refreshment on the go. Just give it a soak to tap into Ruffwear's Swamp Cooler Tech that uses evaporative cooling to help cool your pup. When dry, re-soak to recharge it.