Description of La Sportiva Lhotse GTX Insulated, waterproof, all-leather multi-purpose mountaineering boot great for northwest volcanoes, waterfall ice climbing or Chamonix vacations. Bomb-proof construction, stealth colors and insulated warmth make this boot ideally suited also for winter hunting, cold weather work and mountain combat duty. Features: High padded ankle cuff and contoured heel pocket combined with EZ Flex Tongue and speed lacing hardware for a perfect fit Automatic crampon compatible MPE outsole for excellent traction in all mountaineering conditions 3mm Idro-Perwanger leather with large XSV rubber rand provides durability and protection and the insulated Gore-Tex® Duratherm lining keeps your feet warm in extreme conditions UPPER: 3mm Idro-Perwanger Roughout Leather/Vibram® XSV Rand/Removable EZ Flex Tongue with Dri-Lex® lining/TPU ankle stabilizer CONSTRUCTION: Board Lasted LAST: Makalu LINING: Gore-Tex® Duratherm® SOLE: Skywalk MPE MIDSOLE: SBR Aircushion INSOLE: 8mm Mtnflex with 2mm Dacromet-coated full steel shank WEIGHT: 4 lbs. 14 oz.