Quickly cools your neck. Cool down your body. The side cooling plate cools the blood vessels in your neck quickly. Cool blood circulates in the body to lower body temperature throughout the body. Great for a wide range of uses, including business and outdoor activities, watching sports, and fishing. Uses Peltier elements that are also used for small refrigerators. Adopts the Peltier element that is also used in small refrigerators. When current, one side cools and the other side uses heat generating to cool the body. Adjustable size! : Suitable for both adults and children. The neck size can be adjusted with the adjuster.