This shirt is the lightest in the series and is still packed with innovative technologies that help you give your best. The patented 3D Bionic Sphere System with ThermoSyphon Technology keeps your body temperature optimal, no matter how intense your workout is. The functional zones, such as the Air-Conditioning Channel and the AirComPlex zone on the upper abdomen, ensure efficient thermoregulation. The shirt features ISO-Shoulder and Sweat Traps under the arms to ensure maximum performance at minimal weight. Expansion Ribs at the elbows provide optimal climate comfort while allowing full freedom of movement, so you can focus entirely on your activities. The partial compression supports the performance-enhancing effect and simultaneously improves circulation for optimal cooling. This allows you to endure longer and recover faster. The X-BIONIC ENERGY ACCUMULATOR LIGHT SHIRT LS 1/2 ZIP is the ideal companion for intense winter sports.