The shoes that redefined cushioning when they launched. These men's shoes blend a flexible, adaptive techfit® upper with the plush, energy-filled ride of boost™. The result is a lightweight, neutral running shoe that will invigorate runners of every level, at any distance. techfit® upper is engineered for natural, flexible support and a seamless, sock-like fit. boost™'s energy-returning properties keep every step charged with an endless supply of light, fast energy. TORSION® SYSTEM for midfoot integrity; EVA midsole rim helps keep foot in neutral plane; comfortable textile lining.