Sizing: Fits large; purchase 1/2 size smaller than standard running shoe lengthHeel: MediumMidfoot: Medium to low volumeForefoot: MediumToe-Box Height: Medium to highArch structure: Medium to highShoe Shape: Curved The Merrell Dexterity Tough Mudder is a lightweight trail racing shoe. With an aggressive and agile design, this shoe is built to run fast through soft and technical conditions.