Run sub-2.5 hour marathons and achieve a new personal best with this shoe loaded with speed-boosting features. It includes SMOOTH SPEED ASSIST to help you achieve the ideal gait, plus a G3 sole for great grip at a low weight. The MIZUNO ENERZY LITE at the bottom midsole supports fast running, while the MIZUNO ENERZY LITE+ at the top midsole enhances softness at a low weight.