Weight: 266 g (size UK 5.5)techfit® upper is engineered for natural, flexible support and a seamless, sock-like fitboost™'s energy-returning properties keep every step charged with an endless supply of light, fast energyTORSION® SYSTEM for midfoot integrity; EVA midsole rim helps keep foot in neutral plane; Comfortable textile liningFITFRAME 3D-moulded TPU helps increase stability around the heel; Use miCoach® to track and improve your performanceGrippy rubber outsole with increased cushioning; Runner type: neutral; Stack height: 31.5 mm / 21.5 mm (10 mm differential)