What Our Gearhead(R) Experts Are Saying:"I wore these on a multi-day trek through wet, rocky terrain and never felt a drop of moisture get through. The 3F System flexed naturally on steep climbs while still holding my ankle steady on loose scree."Steep, rocky approaches demand a boot that won't hesitate underfoot, and the Mtn Trainer 3 Tech Mid GTX Boot is built for exactly that terrain. Suede leather and a protective TPU rand shield against sharp rock, while the GORE-TEX(R) membrane keeps water out through stream crossings and unexpected downpours, so a trek never gets cut short by wet feet. The 3F System with TPU structure lets the ankle flex naturally on scrambles while still locking down for stability on loose scree, and a semi-auto crampon-ready heel means this boot transitions straight into more technical mountaineering when the terrain demands it. Underfoot, a fiberglass-reinforced PP plate and Vibram(R) WTC outsole add the support and grip needed to keep moving confidently, mile after mile.