Nike Women Free TR Focus Flyknit - Green Glow/ Glacier Blue (8.5, Green Glow/ Glacier Blue) fabric-and-synthetic Flyknit upper provides breathable flexibility. Flywire cables in the forefoot offer dynamic lockdown. Auxetic tri-star outsole pattern expands and contracts with every step to help maintain flexible stability. Perforations in the vamp help increase ventilation. Molded foam pods in the heel provide comfort and lockdown.