NIKE Women's Free 4.0 Flyknit Glcr Ic/Blk/Plrzd Bl/Unvrsty B Running Shoe 6 Women US Mesh Rubber sole 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