The new 2016 Proviz Reflect360 running vest has been designed to give you a super lightweight running gilet that looks Great and helps you stand out at night. Like the Reflect360 running jacket, our designers have focused on the weight of the jacket to give you optimum comfort. It weighs in at only 100G (size variable) and feels so light that you won't even feel like you are wearing an extra layer! the Reflect360 running vest has a super comfortable soft-mesh back and under arms that allow all the heat that you build up to escape. About the fabric: the reflective material gives you 360 degree reflective surface so that any light from vehicles will reflect back to the driver and help you stand out in advance to give 'astonishing reflectivity'. the material is CE en 20471 certified.