Cloudflyer The new lightweight, fully-cushioned training and racing shoe with Helion™. Any Runner, Any Goal The next-gen Cloudflyer has the plushest tongue of any On shoe and some of our largest Cloud elements. With Helion™ superfoam, a bespoke Speedboard®, 3D-molded heel and a wider outsole, it’s all about comfort and support. Slow and fast. Short and long. Heel and toe. However you run.