The Womens S1 Run Vest is a running vest for women - not too warm and not too cold, but just protective enough so that you can adjust the insulation according to the weather with the layer you choose underneath. The vest has a windproof and water-resistant front and a mesh panel on the back for high breathability. The inside of the collar is soft and sweat-wicking. The vest has a sturdy zipper with a windproof backing and a zippered front pocket with an elastic back that adapts to the contents of the pocket - for example, a phone and cards. Discreet but secure 3M reflective strips on the collarbone and back ensure 360-degree visibility in dark hours. Consider choosing the vest in Hi-Vis for greater safety.