Montrail Men's Trans Alps Mid Outdry Waterproof Hiking Boot 100% Mesh/Welded Thermoplastic Reinforcements/Rubberized Screen Prints Imported Synthetic sole Shaft measures approximately 4.5" from arch Synthetic hiking boot with outdry waterproof breathable upper Fluidfoam midsole for enhanced cushioning and flexibility Fluidguide technology for support and a smoother ride on trail surfaces Rock-guard around the base of the upper for enhanced durability Trailshield outsole protecting your feet against rocks and debris