From The Vibram Website: A rugged outdoor performer. Our KSO Trek delivers the agile performance and protection you need outdoors and on the trail. A more rugged version of our popular KSO, it features a kangaroo leather upper and sockliner that are soft against the foot, yet strong and tear resistant with outstanding breathability. The 4mm EVA midsole offers plating protection from stone bruising, and a lightly cleated 4mm Vibram® performance rubber outsole delivers enhanced traction on trails and rugged terrain.
KSO TREK IS BEST FOR: Light Trekking, Trail Running, & Travel.