The Nike Flex 2017 RN is a lightweight running sneaker that offers flexibility and comfort. They have a breathable mesh upper, Flywire technology, dual density foam midsole, and a rubber outsole with pods on the heel & toe for traction. Lightweight mesh upper provides breathability Flexible outsole pattern for a natural stride Dual-density foam midsole/outsole for lightweight cushioning Rubber outsole pods at heel and toe for durable traction