Head to the trails in style and comfort with the ultimate protection of the Altra Zero Drop Footwear® Superior 2 shoe! A versatile, lightweight trail running shoe. Quick-Dry air mesh upper. FootShapeTM toe box lets your toes relax and spread out in uphill and downhill trail conditions. 5 mm contour footbed for all-day wear. Removable StoneGuardTM rock protection plate protects your feet from sharp rocks and can be removed when being used on less demanding terrain. Cushioned Zero DropTM platform helps you maintain proper form across long distances. EVA, A-BoundTM Blend midsole with InnerFlexTM. TrailClawTM outsole technology features canted lugs beneath your metatarsals for ultimate gripping in the gnarliest of terrain. Last: PFS2-M/PFS-W. Total Stack Height (total thickness of midsole and outsole underfoot): 21 mm. Product measurements were taken using size 8, width B - Medium.