ALIEN 4.0

Regular price $2,500.00 USD
2 total reviews

The perennial, top-of-the-podium boot in major skimo races across the globe, the Alien 4.0 represents the pinnacle of lightweight ski boot engineering. The shell and cuff are crafted from hand-laid carbon fiber, providing ultimate strength and stiffness at a ridiculously low weight. The speed Lock Lite ski-walk mechanism is integrated with the cuff closure via a Dyneema® cord, for quick, single-action transition. The BOA® Fit System floating closure is located under out Light Shield Tech gaiter, ensuring quick, easy and secure fit transitions. The Vibram outsole ensures traction on the snow for mandatory boot pack sections. When low weight, high speed and ultimate race performance are your priorities, reach for the Alien 4.0.

  • Carbon Fiber Cuff: Hand laid carbon fiber cuff for the ultimate in lightweight rigidity, with Pebax® overlapping front panels for a contoured closure
  • Carbon Fiber Shell: Hand-laid carbon fiber shell is super stiff and crazy light, with a protective toe cap
  • Speed Lock Lite: Simple and secure, with 4 forward lean positions, the Speed Lock Lite ski-walk mechanism is strong and reliable on the downhill and fast on the transitions due to a single action Dyneema® cord that closes the cuff
  • The BOA® Fit System delivers micro-adjustable, precision fit engineered to perform in the toughest conditions.
  • Vibram® UFO Sole: Made with TOP85 compound that offers great durability and grip in cold conditions
Color:
Black
Size Size chart
In stock
Features
Features
SPEED LOCK LITE SYSTEM

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 Alien 4.0 system is mounted to a protective Pebax tongue panel and compresses down on the instep as it’s tightened.
SPEED LOCK LITE SYSTEM

SPEED LOCK LITE SYSTEM

The Speed Lock Lite System is a simple and effective system that uses a Dyneema® cord integrating the ski/walk mechanism with the cuff, allowing for quick and efficient single-action transitions. Flipping the lever up both opens the cuff and engages walk mode, while locking it down closes the cuff and sets the ski mode. Set it and forget it - once the cord is adjusted to the proper length you simply switch back and forth between ski and walk modes with one easy motion.
SPEED LOCK LITE SYSTEM
Technical Specs
Technical Specs
Size Options : 39 - 44 (European sizes)
Weight Reference : 610g; 1lbs 5.5oz (1/2 pair size 27)
Waterproof/Breathable : PFAS Compliant
Liner : SCARPA® Race 3.0 SL (Intuition)
Last : 99mm
Outsole : Vibram® UFO 4.0
Shell : Carbon
Cuff : Carbon
Closure : Cord + BOA® Fit System
Flex : 110
Ski/Walk Mode : Speed Lock Lite
Binding System : TLT
OPTIMIZED TOURING PIVOT : 5mm
Country of Origin : Italy
Product Code : 12177500
WARNING: Cancer & reproductive harm. For more information click here.
Awards
Awards
2023 Skialper Boot of The Year
Sizing
Sizing
SCARPA Alien Sizing Chart




Our Alien 3.0 ski boot uses European sizing:

  • 1 Euro whole size = 6.6 mm = 0.26 inches
  • 1 US whole size = 8.4 mm = 0.33 inches
  • Euro sizes provide a better, more precise fit for your intended use



Reviews
Reviews
5.0
Rated 5.0 out of 5 stars
Based on 2 reviews
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
2 reviews
  • M
    Max
    Reviewing
    ALIEN 4.0
    I recommend this product
    Rated 5 out of 5 stars
    July 14, 2024
    Only option when maximum performance is needed.

    I have been impressed by the progression of skimo boots since owning my first pair of F1’s with a bellows nearly 20 years ago. The new Alien 4.0 is what I rely on for maximum performance on my 65mm race skis and 78mm light and fast touring skis. Once you go carbon you won’t go back.

  • CS
    Cole S.
    Reviewing
    ALIEN 4.0
    I recommend this product
    Rated 5 out of 5 stars
    January 11, 2024
    I love this shoe

    I recently bought this shoe since my feet were cold while playing fortnite. So i decided to use my money on something useful like these! i love dick