While the S2 Run Jacket has a protective and super elastic 3-layer breathable laminate on the front and shoulders, and our special C3 material on the back ensures quick and good sweat transport, so you stay dry and comfortable and never get cold and damp, either during or after activity. The running jacket material is very stretchy, so it gets optimal running fit without being tight. The collar`s inside is soft and sweat-wicking. The close-fitting jacket has a robust zipper with windproof and soft back and zipper-closed front pocket with elastic back, which adapts to the contents of the pocket - e.g. phone and card - as well as an open back pocket for gloves, hat, and headband. Discreet but secure 3M reflective tape on the back pocket edge and reflective logos on the shoulders and waist ensure 360-degree visibility in the dark hours. Optionally, choose the Hi-Vis vest for greater safety.