Shaft measures approximately 3 from arch
Flyknit upper for ultra-lightweight support and breathability
Flywire cables for lightweight support and an adaptive fit
Knit-in ventilation holes at the quarter panel for enhanced breathability
Nike Free midsole with hexagonal flex grooves for multidirectional flexibility
Ultra-lightweight flexibility. The Nike Free Flyknit 4.0 running shoe continues the tradition of Flyknit with a woven upper that conforms to the foot for breathable, lightweight comfort with each stride. Flywire cables deliver support without extra weight, while the flexible Nike Free mid-sole/out-sole gives you natural range of motion over any distance.
Nike - FREE 40 FLYKNIT - B00QMAEYXG