Top to bottom, these women’s Nike Flex 2018 RN running shoes are built to flex. Its circular-knit upper stretches in key areas, while the dynamic heel design and molded tri-star outsole pattern work together for an adaptive ride that connects you to your run.Shoe Features Dynamic Flywire cables provide a 1:1 fit Minimal heel design is made with soft foam to secure the back of your foot while allowing natural movement. Tri-star outsole pattern enhances flexibility. Shoe Construction Knit upper Fabric lining Rubber outsole Shoe Details Round toe Lace-up closure Padded footbed Size: 6.5. Color: Charcoal. Gender: Female. Age Group: Adult.