adidas adiZero Takumi-Sen 3 Boost running shoes are Japanese-designed racing flats designed to help top racers achieve their highest speeds from the mile to the marathon. With a midsole that features 30% boost™ technology, you'll experience excellent energy-return. The 3D lasted heel counter provides an industry-leading heel fit. Takumi-Sen 3 running shoes ensure a uniform feel throughout the running gait cycle.Upper: Tirennina suede and Teijin Japanese mesh upper is designed for lightweight, superior flexion throughout heel-to-toe transition. Flat laces reduce irritation. Mesh offers breathable flexibility. Midsole: Forefoot boost™ midsole provides industry-leading energy return. Midfoot TORSION® SYSTEM helps guide the foot's rotation and provides superior rear and midfoot stability. Double-forked forefoot TORSION® SYSTEM allows for maximum propulsion during push-off phase of racing.Outsole: adiWEAR™ heel outsole provides superior grip and durability while maintaining light weight. Continental Rubber toe outsole provides maximum propulsion at toe-off on wet or dry surfaces. Updated quickstrike DSP outsole is designed for superior traction while reducing weight.