5 min read AS MUCH AS the running shoe industry has been obsessed with tech over the past half-decade, the types of innovations available to put on your feet aren’t always that exciting—or even obvious—at first glance. That’s not the case with On’s LightSpray tech , the robot-spun, silly string-like material that the Swiss brand has been showcasing at major running events since late 2024. The translucent, light upper is meant to stand out, even in a crowded field of lightweight, funky-looking kicks. The material was first used for a super shoe, the LightSpray Cloudboom Strike , which pro Helen Obiri wore to Boston and NYC Marathon wins. But that model was an extremely limited release, and most runners would never get a chance to see the tech outside one of On’s robot demos. For the most part, LightSpray seemed like it might be more high-performance gimmick than actual consumer-level innovation. That changes (to some degree) with the next shoe given the LS treatment.…