The Proton XT borrows the rugged and durable VibramA(R) Megagrip outsole from our Neutron 2 and pairs it with a thicker midsole, to deliver our most cushioned and protective ride, perfect for running in rugged terrain or as a cross-over hiking shoe. WEIGHT REFERENCE : 335g; 12.7oz (1/2 pair size 42) UPPER : Mesh / TPU / Micro-Nubuck LINING : Polyester MIDSOLE : EVA-CM OUTSOLE : VibramA(R) Genetic 2 Max / Megagrip INSOLE : TPU Insert DROP : 8mm LAST : ARF CUSHION : High UNDERFOOT PROTECTION : High