Introducing the Cloudswift with Helion™: an active superfoam that does not tire. Helion™ is a lighter, softer, and more agile foam for a ride that feels more alive every step of the run. Whether you’re smashing out a swift 5k at lunchtime, weaving your way across town during peak hour traffic, or in for the long haul on your regular sunday morning run. Cloudswift. Helion your run.