Sizing: Fits large; purchase half size smaller than standard running shoe lengthHeel: Medium to narrowMidfoot: Medium to low volumeForefoot: Medium to narrowToe-Box Height: Medium to lowArch Structure: MediumShoe Shape: Semi-Curved With mild support and responsive cushioning, the Brooks Asteria is a road racing flat that is ideal for 5-10k racing but has versatility to be used for longer races or tempo runs.