Details Nathan's Streak Reflective Vest is ultra-lightweight and sleek- you really won't even notice it except for the moments it lights you up and makes you feel safe and seen. Offering 1200-foot visibility (366-meter) and 360-degree reflectivity, the Streak optimizes performance as well as safety; its form-fitting shape offers full range of motion without interrupting arm swing. There is a reason you see runners wearing the Streak Reflective Vest at any time of day on the trails, on the roads, in races and on Skirack staff at community runs and shoe demos! Material Breathable lightweight polyester mesh Fit One size fits most body-hugging design with VELCRO®-closure tabs for layering adjustments Details Attachment points for Run Longer Light Series and other LEDs 1,200-foot visibility and 360-degree reflectivity for extra safety at all hours Weight 1.6 oz/45.4 g Nathan Streak Reflective Vest