The Flex 2017 RN 'Dark Sky Blue' sneaker uses Nike’s free moving technology for enhanced flexibility and performance. The shoe is constructed of a circular knit upper, synthetic overlays and wrapping Flywire cables. Unveiled in 2008, Flywire is inspired by NASA's utilization of Vectran filaments, known for its ultralight resilience. The two-level Phylon foam midsole and the auxetic tri-star patterned outsole cushions the foot.
| Season | 2017 |
| SKU | 898457 401 |
| Nickname | Dark Sky Blue |
| Colorway | Dark Sky Blue/Gym Blue |
| Main Color | Blue |
| Category | Running |