La Sportiva M Kilo Alpine Touring Boot
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Description
The La Sportiva M Kilo Alpine Touring Boot is a 1,119 g tongueless ski mountaineering boot with a 100.5 mm last, claimed 110 flex, and a 70-degree range of motion, built for fast, light days on touring skis up to 95 mm.
Tech Specs
Features
- Flex: Claimed 110. Tongueless and race-derived, it skis stiff for a 1-kilogram-class boot but softer than a plastic 110 resort boot.
- Weight: 1,119 g per boot (size 27.5) as we weigh it; La Sportiva states 1,000 g at their reference size.
- Last: 100.5 mm, a medium-volume fit with a generous ball and a narrow heel.
- Walk Mode: Tilt-Lock Lite ski/walk lever gives a 70-degree range of motion and works with gloves.
- Shell: Tongueless Grilamid Bio-Based LF Carbon with a forged carbon-fiber cuff covering.
- Liner: High-density thermo-moldable liner with variable thickness plus a WarmSole insert.
- Sole: FriXion Wave Alpine outsole (ISMF race-sole standard) with certified tech inserts.
- Closure: Force Closure System with the Force Power Buckle and a removable power strap.
La Sportiva M Kilo Alpine Touring Boot
The La Sportiva M Kilo Alpine Touring Boot is a 1,119 g (size 27.5) lightweight ski mountaineering boot with a 100.5 mm last, a claimed 110 flex, and a FriXion Wave Alpine sole built for fast, human-powered days. La Sportiva builds the Kilo tongueless from Grilamid Bio-Based LF Carbon, pairing a 70-degree range of motion with a flex that skis well for the weight and a WarmSole insert for cold belays.
Is This the Right Boot for You?
CCBB Boot Ratings
CCBB Fit Profile
Why We Like It
- At 1,119 g per boot in a 27.5, the Kilo tours with the lightest race-plus boots while keeping a real ski-boot closure.
- The tongueless design and 70-degree range of motion give a long, near-frictionless stride for skinning and bootpacking.
- The Grilamid Bio-Based LF Carbon shell holds a claimed 110 flex that skis stiffer than its weight suggests.
- The Tilt-Lock Lite ski/walk lever operates cleanly with bulky gloves and locks securely for the descent.
- The WarmSole insert separates the foot from the cold carbon shell, a real benefit on winter mountaineering days.
- The FriXion Wave Alpine sole mixes harder and softer rubber for grip and wear resistance, and S4 inserts speed entry into Ski Trab bindings.
Best Uses
- Ski mountaineering and technical spring objectives
- Long, high-vertical tour days
- Fast-and-light traverses and skimo-style touring
- Touring skis 85 to 95 mm underfoot
- Skiers with average-to-narrow, medium-volume feet
Bootfitter's Advice
The Kilo fits as a medium-volume boot on a 100.5 mm last, with a generous width at the ball of the foot, a snug and narrow heel pocket, and a toe box that tapers to a point at the big toe. After fitting hundreds of skiers, we find people who found the Scarpa F1 LT tight in the ball of the foot often prefer the extra room here, while those who need sixth-toe or bunion clearance should plan on fit work up front.
Size to a shell fit rather than a street-shoe conversion. The carbon-infused Grilamid shell accepts only moderate punching, so we build most of the fit around the heat-moldable liner and targeted shell work rather than large modifications. The stock power strap is removable if you prefer a cleaner cuff.
Technical Specifications Manufacturer specs · Click to expand
Fit and Construction
- Weight
- 1,119 g per boot (size 27.5) as we weigh it. La Sportiva states 1,000 g at their reference size.
- Last
- 100.5 mm (size 26.5)
- Flex
- Claimed 110 by La Sportiva. Tongueless and race-derived, it skis softer than a plastic-shelled 110 resort boot but stiff for a 1-kilogram-class touring boot.
- Range of Motion
- 70 degrees (33 back, 37 front)
- Shell
- Grilamid Bio-Based LF Carbon, tongueless
- Cuff
- Grilamid Bio-Based LF Carbon with forged carbon-fiber cuff covering
Features and Compatibility
- Walk Mode
- Tilt-Lock Lite ski/walk lever, glove friendly
- Closure
- 3 buckles with the Force Power Buckle, Force Closure System, and a removable power strap
- Binding Compatibility
- Pin-tech (low-tech) bindings only. La Sportiva's FriXion Wave Alpine sole meets ISMF race-sole geometry, not ISO 5355 or ISO 9523, and the boot carries certified tech (pin) inserts. Not compatible with frame, MNC, or alpine bindings.
- Sole
- FriXion Wave Alpine outsole (ISMF race-sole standard) with certified tech inserts and an internal WarmSole platform
- Forward Lean
- 12 and 14 degrees
- Liner
- High-density thermo-moldable liner with variable thickness
Compare the La Sportiva Kilo
La Sportiva Kilo vs. La Sportiva Kilo XTR
The Kilo is the tongueless, lighter member of the family and walks with less resistance, while the La Sportiva Kilo XTR adds a Pebax Rnew Force Flex tongue for a claimed 120 flex and firmer forward support at 128 g more per boot. Choose the Kilo for the uphill and the XTR for the descent.
Shop La Sportiva Kilo XTR bootsLa Sportiva Kilo vs. Scarpa F1 XT
Both are mid-weight touring boots near 1,100 g. The Kilo is tongueless and walks noticeably more freely, while the Scarpa F1 XT uses a BOA and tongue for a touch more front support. We find the Kilo the better skinner and the F1 XT the slightly stronger driver on the down.
Shop Scarpa F1 XT bootsLa Sportiva Kilo vs. Atomic Backland Carbon
Skiers cross-shop these two for low weight and carbon stiffness. The Kilo runs a hair wider at the ball of the foot with a WarmSole insert for cold days, while the Atomic Backland Carbon leans further toward minimalist touring with a simpler closure.
Shop Atomic Backland Carbon boots