Run faster, better, and longer. Increase your performance with the X-BIONIC® TWYCE 4.0 RUN SHIRT SH SL WOMEN of Generation 4.0. Its performance advantage: extremely efficient skin climate management through the patented unique ThermoSyphon® system, the next generation of the 3D Bionic Sphere® system, which features a 200% larger surface area. Its latest development stage maximizes air exchange through 3D structures and Y-shaped elements. It cools when you sweat and warms when you're cold. This helps ambitious runners stay within the optimal performance range for longer. The new Ideo waistband provides safe support, ergonomically optimized in cut and featuring a higher line at the back. New and specifically optimized for running are the forearm area and the comfortable collar, which promotes constant air exchange. The X-BIONIC 4.0 generation of functional clothing for runners is made in Retina® Ultra-High-Definition quality. You can feel the difference in the highly effective density, the intense functional transfer, and the precisely defined functional zones.