The tecnical La Sportiva Nepal Cube GTX Boot is insulated with Comfort Gore-Tex which also provides waterproof breathability so you won't have to worry about your feet's comfort while mountaineering or on your high altitude climb.  The 3D Flex technology La Sportiva uses allows for easy and natural ankle movement. These boots are crampon compatible so they can be used on mixed terrain.

La Sportiva Nepal Cube GTX Boot Features:

• Highly insulating Carbon Tech honeycomb insole is lightweight, stiff and low profile
• Insulated Comfort Gore-Tex® membrane provides waterproof breathability coupled with insulation
• Innovative 3D Flex™ ankle and removable adjustable variable fit tongue

Specs: 

• WEIGHT: 1780 g/pair @ size 42
• LAST: Nepal
• UPPER: 3.2mm silicone impregnated Idro-Perwanger Roughout Leather with high-abrasion resistant fabric / Air-injected rubber rands
• LINING: Gore-Tex® Insulated Comfort Footwear
• INSOLE: Carbon Tech honeycomb insulation / 4mm EVA
• MIDSOLE: 2 mm Polyurethane graded for crampon attachment
• SOLE: Re-soleable Vibram® with Impact Brake System™