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.

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
The BOA Fit System delivers micro-adjustable, precision fit engineered to perform in the toughest conditions.
Waterproof gaiter system provides total snow protection
New Zeppa increases ramp angle by 3.5

FEATURES
Feature Details
BOA FIT SYSTEM
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.

Feature Details
3D LAMBDA FRAME
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.

TECHNICAL SPECIFICATIONS
SIZE OPTIONS : 24 - 31 (whole sizes)
WEIGHT REFERENCE : 990g; 2lb 2.9oz (1/2 pair size 27)
LINER : Intuition Cross Fit Tour LT
LAST : 100mm
OUTSOLE : Vibram UFO RS
SHELL : Carbon Grilamid LFT
CUFF : Carbon Grilamid LFT
FLEX : 100
FORWARD LEAN : 9o / 11o / 13o +/- 2o
RANGE OF MOTION : 72o
SKI/WALK MODE : Speed Lock LT
CLOSURE : 1 Buckle + BOA Fit System
BINDING SYSTEM : TLT
OPTIMIZED TOURING PIVOT : 1mm
COUNTRY OF ORIGIN : Italy
PRODUCT CODE : 121725001