La Sportiva - Glacier (Natural) - Mens: A general mountaineering and heavy-duty backpacking boot that is built to handle rugged and technical terrain!; Features Plush Dri-Lex, a patented multi-zone lining system which transports moisture away from the skin via an exclusive underlayer of 100% Hydrofil nylon from Honeywell, Inc. The fabric layer closest to the skin is always dry, cool and comfortable. Features an anatomically sculpted EZ Flex2 tongue, an articulated and hinged tongue design that effectively eliminates binding in the instep area of our mountaineering boots. Deep padded heel pocket cradles your foot in comfort for long hauls with heavy packs. Vibram Ice-New semi-auto crampon compatible sole for a tough, snow and rock-eating grip. Vibram is the most trusted name in the boot sole business. Features 8mm Mtnflex, a tapered Hytrel nylon insole with a half-length, Dacromet coated, tempered steel shank and a 1mm leather top-sheet. All La Sportiva insoles are proportionally graded to fit the sizing structure of the boot and to create the perfect flex for different size feet. Features PU Aircushion midsole with a half steel shank for serious support and protection. Crush ANY obstacle with this amazing boot!