ALTRA Women's Rivera 2 Road Running Shoes Blue Size 7 B Medium USStay Focused; Engineered mesh uppers are light breathable and ready for the open road Get Comfortable; Altra EGO midsoles provide a responsive yet soft ride and the FootShape toe boxes allow the toes to relax and spread out naturally Push Yourself; Neutral InnerFlex midsole technology increases flexibility and performance Built For You; Bio heels are designed to mimic the natural form of the human heel for a smooth heel to toe transition Go Further;