Created in conjunction with Breaking2, Nike’s attempt to enable the first sub-two-hour marathon, the Nike Zoom Vaporfly 4% was designed with the goal of helping the world’s fastest marathoners run their best. The tooling features new Nike ZoomX foam that is ultra-lightweight, soft and capable of providing up to 85-percent energy return. Embedded within the foam is a full-length curved carbon fiber plate that increases stiffness to provide a sensation of propulsion. Together, these features deliver an average of 4-percent improvement in running economy when compared to Nike’s previous fastest racing flat. A Nike Flymesh upper with midfoot dynamic archband provides zero-distraction containment.