La Sportiva Stratos Hybrid Alpine Touring Boot
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Description
The La Sportiva Stratos Hybrid Alpine Touring Boot is a 781 g skimo race and speed-touring boot with a 100.5 mm last, an 85-degree range of motion, and a Stratos VI carbon cuff on the Kilo lower.
Tech Specs
Features
- Weight: 781 g per boot (size 27.5), an 800-gram race weight.
- Flex: No numeric flex assigned. Race-grade lateral support with a soft, quick forward feel.
- Last: 100.5 mm, one of the wider, higher-volume race fits available.
- Walk Mode: Single-lever race transition delivers an 85-degree range of motion.
- Shell: Grilamid Bio-Based LF Carbon Kilo lower with a Stratos VI carbon-fiber cuff on anti-wear bushings.
- Liner: Heat-moldable Ultralon Stratos Hybrid race liner.
- Sole: FriXion Wave Race outsole (ISMF race-sole standard) with certified tech inserts and full crampon compatibility.
- Closure: 1 buckle with a race throw latch and Force Lite Closure System.
- Forward Lean: Adjustable across 10, 13.5, 17, and 19 degrees.
La Sportiva Stratos Hybrid Alpine Touring Boot
The La Sportiva Stratos Hybrid Alpine Touring Boot is a 781 g (size 27.5) skimo race and speed-touring boot with a 100.5 mm last, no assigned numeric flex, and a FriXion Wave Race sole, built for training, racing, and fast traverses. La Sportiva borrows the carbon-fiber cuff from the Stratos VI, sets it on a Grilamid Bio-Based LF Carbon Kilo lower, and adds an 85-degree range of motion and a single-buckle race closure.
Is This the Right Boot for You?
CCBB Boot Ratings
CCBB Fit Profile
Why We Like It
- At 781 g per boot in a 27.5, the Stratos Hybrid sits in the 800-gram race class while costing less than the carbon Stratos VI.
- The 85-degree range of motion is among the longest strides available, ideal for racing and fast traverses.
- The single buckle with a race throw latch transitions in one motion when the clock is running.
- Anti-wear bushings connect the carbon-fiber cuff to the Grilamid lower for a frictionless, durable pivot.
- The Stratos Hybrid uses the Kilo lower shell, one of the wider and more accommodating race fits on the market.
- S4 inserts speed step-in with Ski Trab bindings, and full crampon compatibility handles technical objectives.
Best Uses
- Skimo racing and structured training
- Fast-and-light traverses and speed touring
- Technical ski mountaineering where weight is critical
- Skinny race and mountaineering skis up to 85 mm underfoot
- Racers who need a wider race fit than a Pierre Gignoux or Alien
Bootfitter's Advice
The Stratos Hybrid uses the Kilo lower shell and a 100.5 mm last, which makes it one of the wider, higher-volume race boots we fit. After fitting hundreds of skiers, we find it a good option for racers whose feet are too wide for a Pierre Gignoux or Scarpa Alien, though the toe box still tapers to a point at the very front. The shell splits on the full size, so a 28 runs longer than many race boots.
The carbon-infused Grilamid lower punches like an Alien: it will move a little but springs back and cannot be pushed as far as a plain plastic boot. The thin race liner leaves room for a warmer aftermarket liner if you plan to use the Stratos Hybrid for long backcountry days rather than pure racing, and expect a small amount of play in the cuff pivots that is normal for a carbon race boot.
Technical Specifications Manufacturer specs · Click to expand
Fit and Construction
- Weight
- 781 g per boot (size 27.5)
- Last
- 100.5 mm (size 26.5)
- Flex
- La Sportiva assigns no numeric flex. Race-grade lateral support with a soft, quick forward feel typical of a skimo boot.
- Range of Motion
- 85 degrees
- Shell
- Grilamid Bio-Based LF Carbon lower (shared with the Kilo)
- Cuff
- Carbon fiber, borrowed from the Stratos VI, on anti-wear bushings
Features and Compatibility
- Walk Mode
- Ski/walk mechanism with a single-lever race transition
- Closure
- 1 buckle with a race throw latch and Force Lite Closure System
- Binding Compatibility
- Pin-tech (low-tech) race bindings only. La Sportiva's FriXion Wave Race sole meets ISMF race-sole geometry, not ISO 5355 or ISO 9523, and the boot carries certified tech (pin) inserts with full crampon compatibility. Not compatible with frame, MNC, or alpine bindings.
- Sole
- FriXion Wave Race outsole (ISMF race-sole standard) with certified tech inserts and full crampon compatibility
- Forward Lean
- 10, 13.5, 17, and 19 degrees
- Liner
- Ultralon Stratos Hybrid race liner
Compare the La Sportiva Stratos Hybrid
La Sportiva Stratos Hybrid vs. Dynafit DNA
Both are dedicated skimo race boots. The Dynafit DNA is a full-carbon boot that skis a touch better on wider skis, while the Stratos Hybrid runs wider and higher in volume with a longer 85-degree stride and an easier single-lever transition, which many racers prefer for comfort over long days.
Shop Dynafit DNA bootsLa Sportiva Stratos Hybrid vs. Scarpa Alien 1.1
The Scarpa Alien 1.1 is a proven carbon race boot that runs narrower and lower in volume, while the Stratos Hybrid is wider and more forgiving through the midfoot and uses a Grilamid lower rather than full carbon. We steer wider race feet to the Stratos Hybrid.
Shop Scarpa Alien 1.1 bootsLa Sportiva Stratos Hybrid vs. La Sportiva Kilo
The Stratos Hybrid and the La Sportiva Kilo share the same lower shell, but the Stratos Hybrid is a lighter race boot at 781 g with an 85-degree stride and a single race buckle, while the Kilo is a heavier touring boot with three buckles and more downhill support.
Shop La Sportiva Kilo boots