Over the back vests don't cool a dog where it counts. KoolSkinz patented ergonomic design places the cooling packs right where it needed on a dogs underbelly. Most products use bulky and use abrasive materials with an “over the back” design. Additionally, these other products don’t effectively cool for longer than 15 minutes at a time. Our underbelly design allows us to apply heat-absorbing protection close to the dog’s skin, even on long-haired dogs. Our vest and kooling packs absorb heat away from the dog’s body while also protecting them from harmful heat reflections they are exposed to from the ground below. By addressing both of these problems, we are able to keep your dog kool and comfortable for hours.