No more heat stress!! Keep your dog cool with the comfortable and easy-to-pack dry cooling vest. After activating the vest by filling it with fresh water, it will immediately start cooling up to 15˚C / 59˚F below the ambient air temperature for a duration ranging from one to three days. Thanks to the patented system, the vest will not become wet or damp during use. The cooling effect is a result of evaporation and largely depends on humidity and airflow. So, protect your dog from heat stress! During and after walks (under the sun), in the car, or anytime cooling is needed. Length (from the back of the neck to the base of the tail): 35 to 60 cm. Chest circumference: 55 to 70 cm.