adidas Response Boost 2 Techfit Mens Running Sneakers/Shoes Mesh Upper - Provides breathability when needed most. TechFit - Engineered for natural, flexible support and a seamless, sock-like fit. Synthetic Overlays - Diminish the overall weight of the shoe while retaining structural support. Boost Midsole - Energy-returning properties keep every step charged with an endless supply of light, fast energy. TORSION System - Provides excellent stability in the midfoot.