Get the boost you need in every step to lower your time and up your distance. Techfit technology makes the upper lighter and more flexible, giving you added support. Molded EVA sockliner offers a better fit and increased comfort in every stride. Energy-returning Boost foam revolutionizes your run and propels you forward. TORSION SYSTEM provides a smoother heel-to-toe transition. Rubber outsole for reliable traction. Wt. 8.8 oz.