Once you take a few strides in the Nike Air Zoom Alphafly NEXT% 2, you'll never look at your favourite pair of old racing shoes the same way again. A thick, lightweight support system marries the 2 worlds of comfort and speed in holy running matrimony. Enjoy the greatest energy return of all our racing shoes while you chase your personal bests. Bounce to the Beat Zoom Air units and full-length ZoomX foam deliver Nike's highest energy return cushioning system, adding more bounce into every step. A thin rubber outsole enhances traction and allows for more ZoomX under the Zoom Air cushioning. The additional foam not only adds more bounce, but also helps improve transition from heel to forefoot. Stay Fresher, Longer Full-length ZoomX foam offers an ultra-lightweight and responsive ride. It's built for speed but also provides cushioning to stay fresh even in the late miles of a marathon. It offers comfort where you need it. Keep Rolling Full-length carbon-fibre plate delivers a sort of roll-forwards feel that makes you want to take on the next step. It gives you a propulsive sensation and helps you smoothly transition through your stride. Both the forefoot and heel offer slightly wider bases for a stable platform, so you can tackle turns on the course with confidence.