Nike's supercharged ReactX foam amps the energy return under a new-generation running shoe that still delivers the plush, smooth ride of earlier iterations.Perfect for: Runners looking for a supportive, well-cushioned ride that transforms every stride into returned energy to help increase speed without increasing effort.Upper: Internal FlyKnit fit band locks your foot in place and moves comfortably to provide stretchy, secure support. Wider toe box allows for unrestricted movement and toe spread on longer runs. Water-repellent toe keeps splashes and moisture at bay.Midsole Drop: 9 mm. Classified as a high-drop measurement, it allows for more cushioning to absorb the impact of heel strikes.Lower: Springy ReactX foam amps up energy return while minimizing environmental impact. Tuned support and targeted cushioning efficiently transition every stride from heel strike to toe-off. Waffled rubber tread puts traction and confidence under every stride.