The X-Bionic® UnderGear functional underwear has been designed to keep the body at a constant temperature of 37 degrees centigrade when engaging in extreme sports such as skiing, running or rock-climbing. The design was created in cooperation with medical doctors, scientists and professional athletes. X-Bionic® UnderGear Energy Accumulator combines three essential functions to accumulate energy. Thanks to 37°CCR-Technology, the underwear has a warming or cooling effect in specific areas of the body. The Vibratronic system mobilises reserve capacities by reducing the vibration. The underwear fits close to the body, thus absorbing vibrations effectively. This supports the nutrient supply and blood circulation due to the compression, which has effects of different strengths on the body. This creates ideal conditions for top performances in sports.