Squamishrock

The cutting edge of mountain-boot technology, the Spantik by La Sportiva (hint: it's a peak in the Karakoram Himal whose Golden Pillar is synonymous with extreme alpinism) combines all the latest, lightest materials to shave a full pound of the Nuptse and still offer unimpeachable climbing performance. Throw in the FLS (Fast Lacing System) and integral gaiter collar to keep spindrift out, and the summit is yours. 
Based on the last of our tried-and-true Nuptse, which is step-in crampon compatible, and a proven performer for north faces, winter alpinism and long periods at altitude
Toasty inner boot features micro-perforated thermo-formable PE/Water-repellant Lorica® with Antiacqua® external coating, and a minimal outsole plate on the bottom for durability
Innovative lacing system (FLS) for inner and outer boots allows one-handed, gloved closure, even in the most heinous conditions 
A bantamweight 5 lbs. 1 oz. per pair

OUTER BOOT: Molded TPU ankle and backstay reinforcement/PE micro-cellular thermal insulating closed cell foam lined with a thermo-reflective aluminum facing coated with an anti-abrasion flocking. 

INNER BOOT: Micro-perforated thermo-formable PE/Water-repellant Lorica® with Antiacqua® external coating 

INSOLE: 5mm Carbon Fiber with thermical, structure and central insert in polyester and aluminum insulation

The World’s most technically advanced cold weather high altitude mountaineering boot for extreme conditions in high places. The Olympus Mon by La Sportiva is the choice. 
PE thermal insulating inner boot combined with synthetic insulated thermoreflective outer boot for a toasty warm performance fit
Vibram® Montagna polyethelene sole with rubber plug and HP3 midsole for excellent step-in crampon compatibility
Reinforced integral highly breathable upper gaiter coupled with a 100% antiperforation Kevlar® fabric and a Riri Storm® zipper

GAITER: Breathable Cordura® (upper part)/Kevlar anti-perforation fabric (lower part)/Riri Storm® zipper (UV resistant and waterproof) 

OUTER BOOT: Cordura® upper lined with dual density PE micro-cellular thermal insulating closed cell foam and a thermo-reflective aluminum facing/Insulated removable footbed/Vibram® XSV Rand 

INNER BOOT: Water repellent breathable upper with polyamide external layer/Dual density PE thermal insulating micro-perforated ventilated foam/Tri-dimensional structured polyester lining combined with pile 

SOLE: Insulating Vibram® PE with rubber inserts 

MIDSOLE: HP3 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