COOL SHIRT™ are the innovators - using temperature-controlled cool water, Cool Shirts Personal Cooling Systems provide unsurpassed cooling in a compact, leak-proof cooling unit. Racers are athletes and racing is vigorous exercise. Independent testing has proven that wearing a temperature-controlled Cool Shirt during racing reduces heat stress, weight loss, dehydration and helps maintain a safe body temperature. While other drivers are fading, Cool Shirts Personal Cooling Systems keep you energized & mentally alert, giving you the competitive edge for those final laps.