fighters use a suit for 90-second bouts and then rest while they are cooled by compressed air blasted into a network of silicone tubes contained in the suit. The air passes out through 1000s of tiny holes held against the skin by an undergarment. Scoring is done by 52 sensors, which 10K times a second measure various forces, including blows, accelerations and vibrations, generated by the impact of hands, feet and weapons. The data are wirelessly transmitted to a computer to calculate the fractures, tissue damage and other injuries which are likely to have been sustained had the fighters been unprotected.