Cloudswift Run the city in the light, swift shoe with full road protection. Features Helion™ superfoam for high performance in urban environments.Technology Helion™ superfoam CloudTec® in Helion™ superfoam gives the Cloudswift cushioning with zero compromises. Engineered for urban running, Helion™ is light on weight but big on energy return and durability. Temperature resistant, it provides the same unrivaled performance in hot and cold conditions. Durable rubber reinforcements provide high traction at high speed, even on wet roads.