The Cool K-9 dog cooling jacker is a breakthroughin thermoreregulating technology. This DOg Cooling jacket work through water absorbing, cross-linked polmers are sewn into supplex fabric. Justs soak the dog jacket hrough with water and then put the jacket on your dog to helphim fight off heat exhaustion and keep him cool on hot days. The dog cooling jacket acts as a perspration syste. It absorbs heat from your dogs body. then allows the heat to be dsipelled into the air by the naturall evaporative process.