Expansion ribs at the elbows ensure optimal climate comfort while providing full freedom of movement. Partial compression supports performance enhancement and simultaneously improves blood circulation for optimal cooling. The new Generation 4.0 is the first to feature Retina Ultra-High-Definition quality for unique functional accuracy. For targeted effects, intelligent functional zones can be positioned even more precisely in the ultra-dense knit. This high-tech underwear for passionate winter sports enthusiasts incorporates a variety of thermoregulating and protective properties. The legendary patented 3D Bionic Sphere System with ThermoSyphon technology is more powerful than ever, working on the chest and back. Complex 3D structures and Y-shaped elements maximize air exchange, cooling when you sweat and warming when you are cold - now faster and more efficiently than ever. Functional zones such as the Air-Conditioning Channel and the AirComPlex zone on the upper abdomen, as well as ISO-Shoulder and Sweat Traps under the arm, are also performance-enhancing thermoregulating technologies.