Sizing: Fits large; purchase 1/2 size smaller than standard running shoe lengthHeel: NarrowMidfoot: Low volumeForefoot: MediumToe-Box Height: LowArch Structure: MediumShoe Shape: Curved The Nike Free RN Flyknit 2017 is a premium lightweight running shoe with extreme flexibility, promoting a more natural running experience. It can be used as a daily trainer or a training tool.