Never worn! On recommends buying a half size up from your usual size “Own any urban run with the all-new Cloudswift. Whether you're crushing your commute or pushing the pace on a lunch break, running on hard surfaces never felt easier. Larger Cloud elements in Helion™ superfoam deliver street-ready cushioning with zero compromise. The sensation? Soft but still responsive. The ride? Smoother than ever, with a re-engineered Speedboard® and more supportive side panels. The next-generation Cloudwift. Helion™ Your Run.