The short sleeve Cool Shirt is designed to cool the user, not make them cold. Each Cool Shirt contains more than 45 feet of medical grade capillary tubing securely stitched on the front and back of the shirt and connects to a compact cooling unit via insulated hose with quick, dry disconnects. 100% pre-shrunk durable cotton. Note: Choose one of four compact cooling units sold separately.Pit Stop USA offers Cool Shirt - Blue - Large BCW-LG at low everyday prices. Be sure to check out all of our products from Cool Shirt including Cool Shirt Cool Shirt Parts and Accessories.