Rough-out leather and 1000D nylon upper for superior protection and comfort. TERRA FORCE X platform for a lightweight fit with durability, traction, and maneuverability. Vibram Helix TFX outsole offers superior acceleration,braking,pivoting and traction in rugged terrains, featuring 360 degree pivot point lugs for pivotal movements and broad flat lugs in the toe, heel and outer edges of the outsole for traction agains walls and rocks.