A technical, warm, and lightweight mountaineering boot with state-of-the-art technology for climbing on mixed terrain. a Highly insulating Carbon Tech honeycomb insole is lightweight, stiff and low profile a Insulated Comfort Gore-TexA(R) membrane provides waterproof breathability coupled with insulation a Innovative 3D Flex(TM) ankle and removable adjustable variable fit tongue WEIGHT: 31.5 oz / 894 g LAST: Nepal UPPER: 3.2mm silicone impregnated Idro-Perwanger Roughout leather with high-abrasion resistant fabric/ Air-injected rubber rands LINING: Gore-TexA(R) Insulated Comfort Footwear INSOLE: Carbon Tech honeycomb insulation/4mm EVA MIDSOLE: 2 mm Polyurethane graded for crampon attachment SOLE: Re-soleable VibramA(R) with Impact Brake System(TM)