Energy Accumulator 4.0 underpants by X-Bionic. Thermoactive piece packed with the latest technologies. Energy Accumulator products are characterized by high compression and insulation. Perfect for extreme conditions. Equipped with revolutionary sphere compression and patented 3D Bionic Sphere® system with ThermoSyphon® technology that ensures faster cooling. It ensures optimal 37°C body temperature and muscle support. X-BIONIC Energy Accumulator 4.0 EAWP05W19W-v005