Vibram Five Fingers KSO Black $85.00 Vibram Five Fingers KSO Black features a thin, abrasion-resistant stretch nylon and breathable mesh upper that wraps your entire forefoot to "Keep Stuff Out." A single hook-and-loop closure helps secure the fit. A non-marking 3.5mm Vibram TC1 performance rubber sole is razor-siped for a sure grip, and a 2mm EVA insole enhances plating protection and comfort. KSO IS BEST FOR: Running, Light Trekking, Climbing/Bouldering, Fitness, After Sport, Water Sports, Yoga/Pilates & Travel