Glow-in-the-dark technology where you leave something under a bright light for a few minutes isn’t exactly new. But this technology, which has been popular with toys and children’s accessories, is now making its way to fitness apparel. New Balance is introducing the Beacon Jacket, which utilizes light-absorbing technology to add built-in visibility for runners who like to head out after the sun goes down. The new jackets were recently shown off at last month’s Outdoor Retailer Show, and will soon be lighting the night sky.