Just soak it in cold water, wring it out, and fasten around your dog. It's a coat that will keep your dog cool on those hot summer days! Evaporative cooling (like an actual swamp cooler) exchanges the dog's heat with the cold temperature of the stored water in the coat to keep him comfortable and ready to run that extra mile.
The coat has an innovative three layer build, consisting of:
Watch Ruffwear's video on how to use the Swamp Cooler Vest