The Cloudflow 4 improves on the well-proven recipe with an updated spoon-shaped composite Speedboard® plate that's stiff, strong and lighter than ever. Working in unison with a forward-rolling geometry there's plenty of pace in this shoe. On's signature CouldTec® midsole is constructed from dual-density Helion™ superfoam which gives you ample cushioning without compromising on that bouncy energy-return we all want.