Sizing: Fits large, purchase 1/2 size smaller than standard running shoe sizeHeel: Medium to narrowMidfoot: Low volumeForefoot: MediumToebox Height: LowArch Structure: MediumShoe Shape: Semi-Curved The ST in the adidas Ultra Boost ST stands for stability. This shoe addsoverpronation support to the all-day cushioning of the Ultra Boost while maintaining the supremely comfortable sock-like fit.