1-Kilogram-Class Ski Mountaineering Boot
Scarpa F1 LT Alpine Touring Boot
Built for skiers who want race-boot weight without sacrificing power and control on descents, the Scarpa F1 LT Alpine Touring Boot is a ski mountaineering boot that pairs a long walking stride with enough shell to drive an 85 to 100mm ski. Weighing in at 995g (size 27) with a 100mm last, a stiff 100-flex feel, and a pin-tech-only Vibram UFO RS touring sole, the F1 LT is primed for big vertical days, technical couloirs, or fast-and-light ski mountaineering objectives. Carbon Grilamid LFT shell and cuff, a BOA forefoot, and a 72-degree range of motion pair a long stride with a wall-like descent flex for total efficiency.
Expert Fit Review Fit profile and recommendations reviewed by CCBB bootfitters.
Is This the Right Boot for You?
Best For
Fit backcountry skiers with narrow-to-average, low-volume feet who want a 1-kilogram-class boot for long tours, ski mountaineering and technical descents, and who drive skis 85 to 100 mm underfoot with pin-tech bindings.
Consider Another Boot If
You have a wide forefoot or high instep, want a progressive rather than wall-like flex, need frame or MNC/alpine binding compatibility, or plan frequent resort laps where a heavier four-buckle boot makes more sense.
CCBB Boot Ratings
Uphill Efficiency
72 ROM at 995 g
Downhill Performance
Stiff, wall-like flex
Walking Comfort
Long low-friction stride
Transition Speed
Lever plus cuff strap
Rating scale: 5 = top of its class, 4 = excellent, 3 = good, 2 = specialized or below average, and 1 = limited.
CCBB Fit Profile
Overall VolumeLow
Toe BoxNarrow
Forefoot VolumeNarrow
Instep HeightLow to Medium
Heel HoldGood
Ankle HoldGood
PunchabilityLimited (carbon shell)
Heat MoldableYes
Why We Like It
- At 995 g per boot (size 27), the F1 LT tours at race-boot weight while skiing far better than most boots that light.
- The 72-degree range of motion gives a long, low-friction stride for skinning, bootpacking and scrambling.
- The BOA forefoot dial micro-adjusts fit on the fly and, after fitting hundreds of skiers, we find it seals a narrow foot more evenly than a ladder buckle.
- The Intuition Cross Fit Tour LT liner is heat-moldable and the whole boot pairs cleanly with pin-tech touring and race bindings.
Best Uses
- Ski mountaineering and technical objectives
- Long, high-vertical tour days
- Fast-and-light spring missions and traverses
- Touring skis 85 to 100 mm underfoot
- Skiers with narrow-to-average, low-volume feet
Bootfitter's Advice
The F1 LT fits as a low-volume boot on a 100 mm last, running narrow through the forefoot with a low-to-medium instep and a secure heel pocket. We size it close to true Mondo and confirm with a shell fit, since Scarpa builds only full sizes and the half-size difference is only in liner pre-molding.
The carbon-infused Grilamid lower does not punch well, so skiers with wide forefeet, prominent sixth-toe or bunion areas, or high insteps should plan on a careful shell fit or look at the punchable F1 XT instead. The stock liner heat-molds and adds toe room, and the thin build packs out over time, so cold-footed skiers often add a warmer aftermarket liner.
Fit profile reviewed by CCBB bootfitters. Final sizing should be confirmed with a shell fit whenever possible.
📏 Technical Specifications Manufacturer specs · Click to expand
Fit and Construction
Weight995 g per boot (size 27). 1,060 g at size 28.
Last100 mm
Flex100 (Scarpa). A stiff, wall-like flex that is firm rather than progressive for the weight class.
Range of Motion72 degrees
ShellCarbon Grilamid LFT with 3D Lambda Torsion Frame
CuffCarbon Grilamid LFT
Features and Compatibility
Walk ModeSpring-loaded Speed Lock LT ski/walk lever
ClosureBOA forefoot dial, cuff buckle with Velcro strap, plus removable power strap
Binding CompatibilityPin-tech (low-tech) bindings only. The Vibram UFO RS sole is a lightweight rockered touring profile that is not certified to ISO 9523, so the F1 LT is not compatible with frame, MNC, or alpine bindings.
SoleVibram UFO RS rockered touring sole (not ISO-certified) with certified tech inserts
Forward Lean9, 11, 13 degrees (plus or minus 2 degrees with liner spoiler)
LinerIntuition Cross Fit Tour LT, heat-moldable
Compare the Scarpa F1 LT
F1 LT vs. Scarpa F1 XT
Both share the 72-degree range of motion and the same Vibram UFO family sole. The F1 LT is lighter at 995 g and stiffer with a wall-like flex, but its carbon lower cannot be punched. The Scarpa F1 XT adds a punchable Grilamid lower, two buckles and a cam power strap for a more progressive, adjustable fit at 1,120 g.
Shop Scarpa F1 XT boots
F1 LT vs. Scarpa F1
The classic Scarpa F1 is a tongued boot with a 102 mm last, a 62-degree range of motion and a softer, more progressive flex at 1,248 g. The F1 LT saves over 250 g per boot, walks with 10 more degrees of motion and skis stiffer, but gives up the F1's easier-fitting shell and warmer liner.
Shop Scarpa F1 boots
F1 LT vs. Tecnica Zero G Peak Carbon
Skiers cross-shop these two 1-kilogram-class boots often. The Zero G Peak Carbon skis a more progressive flex and pairs an ISO 9523 sole with tech inserts, while the F1 LT is lighter, walks with a longer stride, and uses a BOA forefoot but is strictly pin-tech.
Shop Tecnica Zero G Peak Carbon boots
Common Questions
Who should buy the Scarpa F1 LT?
The Scarpa F1 LT suits fit, experienced tourers with narrow-to-average, low-volume feet who want a 1-kilogram-class boot for big days and ski mountaineering but still expect to drive skis 85 to 100 mm underfoot. It rewards skiers who value a long, efficient stride.
Is the Scarpa F1 LT really a 100 flex?
Scarpa lists the F1 LT near a 100 flex, but we find it skis as a stiff, wall-like flex rather than a progressive alpine 100. It is firm and supportive for the weight, yet it hits a hard stop rather than flexing smoothly, which is why many skiers who want progression prefer the F1 XT.
What bindings does the Scarpa F1 LT work with?
The Scarpa F1 LT is a pin-tech-only boot. Its Vibram UFO RS sole is a lightweight rockered touring profile that Scarpa does not certify to ISO 9523, so it works only with pin-tech (low-tech) touring and race bindings and is not safe in frame, MNC, or standard ISO 5355 alpine bindings. The certified tech inserts are required for those pin bindings.
Can the Scarpa F1 LT be punched for wide feet?
Only slightly. The F1 LT uses a carbon-infused Grilamid lower that resists punching, so a skilled fitter can gain a couple of millimeters at most. Skiers with wide forefeet or bunions usually do better in the punchable Scarpa F1 XT or the wider classic F1.
How does the Scarpa F1 LT sizing run?
The F1 LT runs close to true Mondo length and comes in full sizes only. Scarpa shares a shell between a full size and the half size above, differing only in liner pre-molding, so a 26.5 foot and a 27 foot share the 27 shell. Confirm with a shell fit rather than a street-shoe conversion.
Is the Scarpa F1 LT warm enough for winter touring?
The F1 LT uses a thin Intuition Cross Fit Tour LT liner built for high-output days, and its low-volume shell limits how thick a liner it can hold. Skiers with cold feet or long, low-output winter days often add a warmer aftermarket liner or an overboot.
What was the 2022 Scarpa F1 LT recall?
Scarpa North America recalled F1 LT and F1 GT boots manufactured in 2022 due to a ski/walk mechanism that could unexpectedly release, a fall hazard. The manufacture date is stamped in the shell. Current production is not affected, but buyers of used 2022 pairs should check the date and contact Scarpa.
How durable is the Scarpa F1 LT?
The F1 LT is light and the exposed BOA, walk lever and thin gaiter are wear points, so we treat it as a touring tool rather than a resort daily driver. Skied within its 85 to 100 mm range it holds up for many seasons, and the BOA, liner and walk parts are replaceable.
Should I choose the F1 LT or the F1 XT?
Choose the F1 LT for the lightest weight and a stiffer, wall-like flex if your foot fits the carbon lower. Choose the F1 XT if you need a punchable shell, want a more progressive flex, or prefer a buckle over the BOA. They share the 72-degree range of motion and sole family.
Our Verdict
The Scarpa F1 LT is one of the strongest 1-kilogram-class options for skiers who prioritize the uphill and still want to drive a real ski. It tours at race-boot weight with a 72-degree range of motion and skis a stiff, wall-like flex that handles skis up to 100 mm. It fits best on narrow, low-volume feet, it does not punch well, and it is strictly a pin-tech boot, so it rewards committed tourers rather than resort skiers.
