Stable, cushioned and built to offer a smooth, robust ride in the longest trail races, the M1 is optimized for the mountains. It features our next-gen JETCELL midsole to deliver unmatched energy return, and a full-coverage outsole with a trio of Vibram technologies for predictable grip in extreme situations. Product Details Weight 9.7 oz / 275 g(US M9) Drop (Stack Height) 4 mm(Heel 38 mm, Forefoot 34 mm)