Cooling vestThe Cooling vests advanced 3Chill tec system ensures lasting relief, so your dog can join you outdoors on the warmest days. Wet the vest: Dunk it in a bucket of cold water or a river. The felt mid layer quickly absorbs and evenly distributes water, holding up to nine times its weight for an instant and long term effect. Put it on with ease: Slide the vest over your dogs head, secure the durable chest buckles, and adjust the elastic neck and chest