Combining ultralight elements of our Alien race boots with a more versatile, backcountry-oriented design, the all-new F1 LT is our lightest weight alpine touring boot, optimized for high-mileage missions, ambitious traverses, and technical ski mountaineering descents.

Features:

• 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°

The patented Boa® Fit System consists of three integral parts: a micro-adjustable dial, super-strong lightweight laces, and low friction lace guides. Each unique configuration is engineered for effortless precision delivering a connected, fast, customized, and durable fit, and is backed by The Boa® Guarantee. The F1 LT system is an exclusive floating system located under the waterproof fabric cover that contracts downwards on the instep of the liner as the dial is tightened, precisely controlling volume and fit.

Similar to an i-beam, the 3D Lambda Frame adds raised ribs of Carbon Grilamid LFT in a specific pattern along both sides of the shell. This design significantly increases strength, durability and torsional rigidity with minimal added weight. The 3D Lambda Frame improves responsiveness and overall performance, allowing you to focus on the terrain, and not your boots.

All SCARPA ski boots use Mondo sizing.

SCARPA ski boots break on the half size, this means that a half size shares the same shell length as the whole size above it but the liners are lasted for each 1/2 size. For example, a 25.5 and 26.0 are the same shell size but the respective liners come pre-molded to the half size.

Some skiers may want to downsize up to 1 full Mondo size, depending upon personal preference.