Sizing: Fits small; purchase 1/2 size larger than standard running shoe lengthHeel: MediumMidfoot: Medium to high volumeForefoot: WideToe-Box Height: Medium to lowArch Structure: MediumShoe Shape: Semi-Straight The Altra Olympus 2.5 is Altra's most cushioned trail shoe. With sticky traction and all-day cushioning, this is a great choice for ultramarathons or rugged trail runs.