The men"s Vibram Fivefingers® KSO is one of Vibram"s more popular barefoot runners thanks to it"s versatility. The Fivefingers KSO has a thin, abrasion-resistant stretch nylon with breathable mesh upper that covers your entire forefoot to "Keep Stuff Out". A hook-and-loop closure provides a secure fit. The non-marking 3.5mm Vibram TC1 performance rubber sole is razor-siped for a sure grip, coupled with a 2mm EVA midsole providing plating protection and comfort. Amoung the Vibram® FiveFingers® KSO"s best uses include running, fitness training, cross-fit, light trekking, bouldering, water sports, and travel.Men"s Weight: 11.4 oz. (pair)..