Sizing: Fits small; purchase 1/2 size larger than standard running shoe lengthHeel: WideMidfoot: Medium to high volumeForefoot: WideToe-Box Height: MediumArch Structure: MediumShoe Shape: Semi-Straight The Altra Olympus 2.0 is Altra's most cushioned trail shoe. With versatile traction and all-day cushioning, this is a great choice for ultramarathons or trail runs with lots of downhill running.