The 3.2 mm one-piece silicone impregnated leather upper offers excellent durability and fit for this winter mountaineering beast of a boot. The Nepal last offers an excellent fit for any foot and is easily adjustable with the removable/adjustable tongue. EZ Roller hardware allows you to lock down the laces and the Gore-Tex® lining provides long lasting warmth in the mountains. This boot is excellent for colder days where you need lots of support and protection on technical long endeavors.