The Zoom Fly 6 is with you every step of your run. Lighter than the Zoom Fly 5, its responsive ZoomX foam adds energy return to each stride, while a carbon-fibre plate helps propel you to the finishing line. ZoomX foam, Nike's lightest and most responsive foam, delivers our most energy return with every stride you take. The full-length carbon-fibre plate increases efficiency and responsiveness. The thin rubber outsole is lightweight and grippy on the road.