Help your four-footed friend in the summer heat! This cooling vest provides relief in warm sunny weather by cooling your dog's chest area. Soak the vest thoroughly in cold water, then wring it out until it stops dripping. The cooling effect is created by the water as it evaporates. The duration of the cooling effect varies depending on the ambient temperature, the air humidity and your dog's size. Cooling will gradually decrease as the vest dries, so never leave your dog wearing the vest unattended. The vest has a zip on the back.