ZoomX foam plus a carbon fiber plate equals a propulsive ride. 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 fiber Flyplate helps propel you to the finish line. Responsive Speed ZoomX foam, Nike’s lightest and most responsive foam, delivers our most energy return with every stride you take. Carbon Fiber Flyplate Full-length carbon fiber Flyplate increases efficiency and responsiveness. Grippy Outsole Thin rubber outsole is lightweight and grippy on the road.