The Mens S1 Run Vest is a running vest for men - neither too warm nor 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.