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. They've used abrasion-resistant Coconut Active Carbon in the upper for natural breathability, 4mm EVA in the midsole for plating protection, and added a lightly cleated 4mm Vibram® performance rubber outsole for extra traction on a variety of terrain.