The Altra King MT is made for runners who embrace mud, rocks and burly mountain climbs and has made its mark as the quintessential king of the mud. The King MT 1.5 features a new upper with reinforced mesh and enhanced drainage features at the toes and medial midfoot, The FootLock(TM) strap has been moved medially and lower down the arch for increased comfort, and the neoprene inside the heel is softer and more secure. The awesome, grippy Vibram(R) outsole, 6mm lugs, and the dual nature Altra EGO(TM) midsole are too good to change, so we kept them the same. Features: - Weight: 8.5 oz. / 241 g - Insole: 6 mm Contour Footbed - Midsole: Altra EGO(TM) - Outsole: Vibram(R) MegaGrip(R) with 6 mm lugs - Stack Height: 19 mm - Upper: Tear resistant quick-dry upper