The On Cloudswift is the first running shoe in the On Running range to incorporate Helion midsole material. Helion is a lighter, softer and more agile foam that does not tire with use. On Cloudswift has a very smooth fit with zero pressure points. The upper is sock lined for forefoot comfort and the new external heel counter design keeps you locked down. The Cloudswift is equally suited to running a Park Run PB shoe or a Sunday long run.