115-Flex Ski Mountaineering Boot
Scarpa F1 RS Alpine Touring Boot
The Scarpa F1 RS is a ski mountaineering boot for advanced backcountry skiers who want race-derived weight without a race fit. Overlap Flow construction lets the shell open wide enough to step into easily, and the BOA H+1 closure wraps the forefoot in one geared motion rather than through a row of buckles. At 1,340 g per boot in a 27 with a 115 flex on a 101 mm last and 60 degrees of cuff rotation, it sits between a race boot and a freeride touring boot and skis harder than its weight suggests.
Expert Fit Review
Fit profile and recommendations reviewed by CCBB bootfitters.
Is This the Right Boot for You?
Best For
Advanced backcountry skiers with low to medium-volume feet who want a light boot that still skis, on skis 85 to 105 mm underfoot, running pin bindings.
Consider Another Boot If
You want frame or MNC compatibility, or a wider fit. The sole carries no published ISO norm and the last runs low through the forefoot.
CCBB Boot Ratings
Uphill Efficiency
60 degrees of rotation at 1,340 g (size 27)
Downhill Performance
115 flex on a 101 mm last
Walking Comfort
60 degrees of cuff rotation
Transition Speed
Single-motion FS Lever with one buckle
Rating scale: 5 = top of its class, 4 = excellent, 3 = good, 2 = specialized or below average, and 1 = limited.
CCBB Fit Profile
Overall VolumeLow to medium
Toe BoxMedium
Forefoot VolumeLow
Instep HeightMedium
Heel HoldGood
Ankle HoldGood
PunchabilityModerate
Heat MoldableYes
Why We Like It
- Overlap Flow construction is the feature you notice on a cold transition: the shell opens far enough that getting in and out stops being a fight.
- A 115 flex at 1,340 g per boot in a 27 is a lot of shell for the weight, and the Booster power strap comes standard rather than as an upgrade.
- The BOA H+1 system closes the forefoot in one geared motion with multidirectional micro-adjustment, and one buckle handles the cuff, so a transition is two actions.
- A 101 mm last is a touring last rather than a 99 mm race last, which makes this the F1 that fits feet the Alien family will not.
Best Uses
- Fast ski mountaineering and long ascents
- Spring couloirs and technical terrain
- Skiers who transition often and value one-motion closure
- Pin-binding setups only
Bootfitter's Advice
The F1 RS runs a 101 mm last, low through the forefoot with a medium instep. It is the roomier of Scarpa’s fast boots and fits feet that the 99 mm Alien shells pinch, without going up to the 102 mm Maestrale platform. Size with a shell fit.
Glass-fiber reinforced Grilamid takes punching moderately: less readily than plain Grilamid, more than a carbon shell. Work the fit through the Intuition FS Tour liner where possible, which Scarpa specifies at 6 to 8 minutes. Forward lean is 15 degrees with 2 degrees either way.
Fit profile reviewed by CCBB bootfitters. Final sizing should be confirmed with a shell fit whenever possible.
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Technical Specifications
Manufacturer specs · Click to expand
Fit and Construction
Weight: 1,340 g per boot (size 27)
Sizes: 24.5 to 31 (half sizes)
Last: 101 mm
Flex: 115
Range of Motion: 60 degrees
Shell: Grilamid Fiber Glass LFT, a glass-fiber reinforced nylon
Cuff: Pebax Rnew, a castor-oil-based plastic
Tongue: Pebax Rnew
Features and Compatibility
Walk Mode: FS Lever ski/walk mechanism
Closure: One buckle with a BOA Fit System and a Booster power strap
Binding Compatibility: Pin/tech (low-tech) bindings. Scarpa’s own binding-system line reads TLT and AT; until Scarpa confirms a sole norm we publish the narrower answer.
Sole: Vibram FS outsole with Durastep rubber and a traction lug design. No ISO norm published.
Forward Lean: 15 degrees, plus or minus 2 degrees
Liner: Intuition FS Tour liner, a heat-moldable foam
Liner Mold Time: 6 to 8 minutes
Article Number: 12101/501
Notes: Overlap Flow construction with the BOA H+1 closure system
Compare the Scarpa F1 RS
F1 RS vs. Scarpa F1 RS Women’s
The Scarpa F1 RS Women’s is the same construction at a 100 flex and 1,210 g per boot in a 25, on the same 101 mm last with a women’s-specific liner and a shorter size run. Flex and size run separate them rather than fit.
Shop Scarpa F1 RS Women’s boots
F1 RS vs. Scarpa F1 XT
The Scarpa F1 XT is lighter at 1,145 g per boot in a 27 on a 100 mm last, with 72 degrees of rotation against 60 here, and it runs whole sizes only. The F1 RS is stiffer and easier to get into. Both are pin-only boots.
Shop Scarpa F1 XT boots
F1 RS vs. Scarpa Maestrale RS
The Scarpa Maestrale RS is the freeride touring boot at a 130 flex and 1,570 g per boot in a 27, on an ISO 9523 sole that also takes frame and MNC bindings. The F1 RS gives up 230 g and that compatibility. Skiers on skis over 105 mm should take the Maestrale RS.
Shop Scarpa Maestrale RS boots
Common Questions
Who should buy the Scarpa F1 RS?
The Scarpa F1 RS suits advanced backcountry skiers who want a light boot that still skis properly. At 1,340 g per boot in a 27 on a 101 mm last with a 115 flex and 60 degrees of cuff rotation, it covers ski mountaineering on skis 85 to 105 mm underfoot without the narrow fit of a race shell.
What bindings work with the Scarpa F1 RS?
Pin/tech (low-tech) bindings. See the question below on why we publish the narrower answer.
Scarpa lists this boot as AT compatible. Why do you say pin only?
Because Scarpa’s own data does not agree with itself. The technical manual lists the binding system as TLT and AT, but gives the outsole only as Vibram FS with no ISO designation. On boots that do carry the norm, such as the Maestrale RS, Scarpa prints it explicitly as Vibram Cayman LT (ISO 9523). Frame-binding release depends on sole geometry defined by that norm, so we publish pin/tech only until Scarpa confirms it. We have asked. If you need a frame binding, choose a boot with a stated ISO 9523 sole.
What is the range of motion on the Scarpa F1 RS?
60 degrees.
What foot shape fits the Scarpa F1 RS?
A low to medium-volume foot on a 101 mm last. It runs low through the forefoot with a medium instep, and it is the roomier of Scarpa’s fast boots: feet that the 99 mm Alien shells pinch often fit here.
What is Overlap Flow construction?
A shell design that lets the boot open much wider than a conventional cuff allows, so stepping in and out is easier, while keeping full cuff rotation for touring. It is the main thing separating this boot from the F1 XT.
How does the F1 RS compare to the F1 XT?
The F1 XT is 195 g lighter per boot and rotates further, 72 degrees against 60, on a slightly narrower 100 mm last in whole sizes only. The F1 RS is stiffer at 115 against 110, easier to enter, and available in half sizes. Neither takes a frame binding.
Our Verdict
The Scarpa F1 RS is the boot for skiers who want race weight and a fit they can live with. Overlap Flow entry and the BOA H+1 closure make it fast to get in and out of, 1,340 g per boot in a 27 is light for a 115 flex, and the 101 mm last takes feet the Alien shells will not. The open question is the sole: Scarpa publishes no ISO norm for the Vibram FS outsole while listing AT compatibility, so we treat it as a pin-binding boot until they confirm otherwise. On a pin setup it is one of the strongest light boots Scarpa makes.
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