Building on the success and versatility of the hugely popular KSO and KSO Trek, Vibram FiveFingers presents the KSO Trek Sport. The KSO Trek Sport is often referred to as the 4x4 of the Vibram FiveFinger range. It offers a 4mm EVA midsole for plating protection and a lightly cleated 4mm Vibram performance rubber outsole for added traction on a variety of surfaces. The Coconut Active Carbon upper offers strength, natural breathability and abrasion resistance for maximum performance during outdoor and athletic pursuits. This is the perfect style for trail running over the most extreme rugged terrain.