A cold weather, high altitude double boot for extreme conditions. This super lightweight double boot has a PE thermal insulating inner boot that is coupled with a thermo-reflective outer boot with an integrated gaiter. LA Sportiva used a super insulating lightweight PE outsole to keep the weight down and the TPU midsole is excellent for crampon compatibility and stability on steep terrain. IDEAL TERRIAN: High altitude 8000 meter peaks. WEIGHT: 39.86 oz 1130 g. LAST: Olympus Mons. OUTER BOOT: Cordura® upper lined with dual-density PE micro-cellular thermal insulating closed cell foam and thermo-reflective aluminium facing/ Insulated removable footbed/ Vibram® rubber rand. INNER BOOT: Water repellant breathable upper with polyamide external layer/ Dual-density PE thermal insulating micro-perforated ventilated foam/ Tri-dimensional structured polyester lining combined with pile. GAITER: Breathable Cordura/ Kevlar anti-perforation fabric/ Riri Storm® zipper (UV resistant & waterproof). INSOLE: 5mm Carbon Fiber + 2.5mm PE micro-cellular thermal insulating closed cell foam topped with a thermo-reflective aluminum layer reinforced with perforated hydrophobic non-woven facing. MIDSOLE: TPU/ Micropore EVA. SOLE: Insulating Vibram® PE w/ rubber toe inserts. COLOR: Yellow/Black. SIZES: 39 - 47 (half sizes). ITEM NUMBER: 290.