Weight: 11 ounces (size 9); Midsole drop: 10 mm (heel: 32 mm / forefoot: 22 mm); Neutral shoes offer flexibility and versatility, with premium cushioning Techfit upper is engineered for natural, flexible support and a seamless, sock-like fit Stretchweb outsole flexes naturally for an energized ride, while Continental Rubber gives you superior traction Tailored Fiber Placement offers stitched-in reinforcement for targeted support at midfoot; Solar Propulsion Rail helps guide and propel the foot Boost is our most responsive cushioning ever, delivering incredible energy return: The more energy you give, the more you get