Combing ultralight elements of our Alien race boots with a more versatile, backcountry-oriented design, the all-new F1 LT is Scarpa's lightest weight alpine touring boot, optimized for high-mileage missions, ambitious traverses, and technical ski mountaineering descents. Carbon Grilamid® LFT shell & cuff delivers incredible power to weight ratio 3D Lambda Torsion Frame increases lateral stability and downhill performance Speed Lock ski walk mechanism is strong, precise and easy to use Boa® Fit System for a fast and secure fit Waterproof gaiter system provides total snow protection New Zeppa increases ramp angle by 3.5° Technical features Binding TLT (Optimized Touring Pivot - 6mm) Buckles 1 + BOA® Fit System Flex Index 100 Forward Lean 20° & 22° Last 100 mm ROM 72° Shell Carbon Grilamid® Sole Vibram® UFO RS Weight 990g 1/2 pair size 27