Engineered mesh upper is built for breathability and lightweight support • Padded heel collar and gusseted tongue help lock foot in place • Additional arch reinforcement with built-in breathability • ShiftFoam™ midsole propels you forward with lightweight energy return and springy cushioning • Rocker shape encourages smooth heel-to-toe transitions • An extra flex groove on the outsole mirrors a woman's footstrike for a smooth ride • Weight: 221g (7.8oz) in a US Women's size 8 • Heel-to-toe drop: 7mm