Nike Flex RN 2018 Premium-Women's Running Shoe- Size 7 CONNECT TO YOUR RUN.-Top to bottom, the Nike Flex RN 2018 Premium is built to flex with you. Its circular-knit upper stretches in key areas, while the dynamic heel design and geometric outsole work together for an adaptive ride that connects you to your run.-- Circular-knit and synthetic upper provides stretch and support.-Dynamic Flywire cables deliver a locked-down fit.-Geometric outsole pattern helps the shoe bend with your foot.-Minimal heel design is made with soft foam to secure the back of your foot.-Co-molded midsole uses a softer foam directly underfoot and a slightly firmer foam for support where you need it.-