Weight: 226 g (size UK 5.5)boost™'s energy-returning properties keep every step charged with an endless supply of light, fast energyadidas Primeknit is carefully engineered to naturally expand with your foot while you run to give you a more comfortable fit and help reduce irritation; SOCKFIT upper for a snug, supportive fitStable band construction holds the foot while allowing natural flexibility; High-comfort liningMoulded heel counter; Outsole-grade EVA outsole for gripRunner type: natural; Stack height: 29 mm / 19 mm (10 mm differential)