La Sportiva Nepal Cube GTX Mountaineering Boot - Men's 80% 3.2mm silicone impregnated Idro-Perwanger Roug State of the art lightweight mountaineering boot with enhanced technology for mixed terrain Carbon Tech honeycomb foot bed for insulation and weight savings 3D flex ankle for great mobility Removable & adjustable fit tongue Gore Tex insulated comfort membrane provides waterproof breathability