The Ruffwear Swamp Cooler Neck Gaiter is a reversible, everyday cooling neck gaiter for dogs that's designed to keep four-legged friends cool when exploring in hot and dry weather conditions. Simply soak in water to activate the core layer and promote the evaporative cooling technology. Then when dry, re-soak to recharge it. Can be used standalone for an everyday cooling piece, or with other Swamp Cooler™ gear (sold separately). Trail Tested Promise All of Ruffwear's products are rigorously field tested and they proudly guarantee against defects in materials and craftsmanship.