The Ultra Long-Sleeve Zip Jacket made of quick-dry fleece is thin, lightweight, and guarantees the best-possible ventilation for runners on ultra courses or longer distances. The extraordinarily finely knit four-way-stretch fabric regulates changing temperatures. Runners can thus avoid that annoying put-it-on, pull-it-off routine. Nevertheless, the 230-gram-light thermal layer functions as a cozy layer with its brushed inner face. Underarm laser perforations provide active air movement. Two pockets at the back of the jacket allow quick, one-handed storage and easy retrieval of flasks and small water bottles. A small compartment integrated at the nape of the neck in the jacket can carry the external battery pack for an ultrarunner's headlamp. Also practical for competitors and those always watching the clock: A small opening at the wrist cuff allows you to see your watch with a quick glance.