LW Reflective Safety Vest for Running Jogging Cycling Biking Walking Exercising Black Mesh LW Reflective Safety Vest for running biking cycling walking; 100% breathable black mesh. Lightweight (3.8 Oz) and velcro adjustable; Unique shape for full range of motions BE SEEN, BE SAFE, when exercising in early mornings and evenings when it is dark. Please see size chart for sizing information.