Don't let warm temperatures put you off and stay efficient with the X-BIONIC® FENNEC 4.0 CYCLING ZIP SHIRT SHORT SLEEVE MEN even at the highest temperatures. The new 4.0 generation is the first to feature the Retina® ultra-high definition quality for unique accuracy of functionality. For a targeted effect, intelligent functional zones can be positioned even more precisely in the ultra dense knitted fabric. Feel the technological advantage of the legendary patented 3D Bionic Sphere® System with ThermoSyphon® technology: complex 3D structures and Y-shaped elements maximize air exchange, cool when you sweat and warm when you are cold - now faster and more efficient than ever. The invisible zipper and the Anatomically Shaped Hem support the biking performance with their ergonomic design.