The Women`s S2 Run Vest features a protective and super elastic 3-layer breathable laminate on the front and shoulders, and our special C3 material on the collar and parts of the back ensures quick and effective sweat transport, keeping you dry and comfortable and never cold and damp, during or after activity. The close-fitting running vest has a highly elastic mesh panel on the back for great breathability. The high stretch also helps to provide the vest with optimal running fit without being too tight. The inside of the collar is soft and sweat-wicking. The vest has a sturdy zipper with a windproof and soft backside, and a zipper-closed front pocket with an elastic backside that adapts to the contents of the pocket - such as a phone and cards - as well as an open back pocket for gloves, hats, and headbands. Discreet but secure 3M reflective logos on the collarbone and lower back ensure 360-degree visibility in the dark hours.