Double visibility at night with the Luminous Safety Vest by LumiGram. This French company designs and produces clothing and textiles using a patented luminous fabric that contains ultra-thin optical fibers, directly woven with synthetic fibers. The Luminous Safety Vest has reflective tape as well as the special luminous fabric that is powered by 3 AAA batteries. The battery box has an on/off switch to control the lighting of the vest which can last up to 20 hours. One size fits all and is safe to wear in wet or rainy conditions. Be sure to turn it on for your next night run or ride!