These are worn and do have slight crack in the foam. Super comfortable! Still have lots of life left in them. 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. Full-length carbon fiber plate delivers a sort of roll-forward 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. Part of the Flyknit family—Atomknit material on the upper has a contoured fit while being lightweight and super-breathable. Specifically designed lofted heel pods use Flyknit yarns for secure, extended comfort and lightweight heel lockdown.