ZoomX foam plus a carbon fiber plate equals an energized 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 Product Details - Weight - Approx. 265g/9.3oz (Men's US 10). Heel-to-toe drop - 8mm. Synthetic leather on upper. Reflective details. Not intended for use as Personal Protective Equipment (PPE).