Optimize your outdoor performance. Building on the success and versatility of the KSO and KSO Trek, FiveFingers presents the TrekSport for outdoor enthusiasts. It"s designed with rugged, high-performance materials to help maximize your outdoor experience. We"ve used abrasion-resistant Coconut Active Carbon in the upper for natural breathability, 4mm EVA in the midsole for plating protection, and Vibram FiveFingers added a lightly cleated 4mm Vibram® performance rubber outsole for extra traction on a variety of terrain.