Sizing: Fits Small; purchase 1/2 size larger than standard running shoe lengthHeel: Medium to narrowMidfoot: Low volumeForefoot: NarrowToebox Height: LowArch Structure: Medium to highShoe Shape: Curved The ASICS Gel Hyper Tri 3 is a lightweight road racing flat. Its seamless design and fastastic ventilation make it a great option for triathlon racing.