CoolShirt Drag Pack Systems - Medium Designed for Drag racers specifically Comes with the newly designed DRAGPACK ice based cooler system, a Driver Cooling Vest, a 12 ft insulated hose, and a 7 hr. lithium battery with charger Reaction times alone can be reduced by as much as 20% with only a 2% loss in hydration Covers 30-40% of the body with cold water circulating through tubing designed to dissipate heat away from the body, in-turn, cooling the core