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Scarpa Alien 4.0 Ski Boots

by Scarpa
Original price $2,999.95 - Original price $2,999.95
Original price $2,999.95
$2,249.99 - $2,249.99
Current price $2,249.99
Choose a Size

Introducing the Alien 4.0, the ultimate lightweight ski boot for elite skimo racing. Handcrafted from carbon fiber, it blends strength and low weight seamlessly. The Speed Lock Lite ski-walk mechanism ensures swift transitions, while the BOA® Fit System provides precision fit in tough conditions. The Vibram outsole delivers traction in snow.

Key Features:

  • Carbon Fiber Cuff: Lightweight rigidity with a contoured fit.
  • Carbon Fiber Shell: Exceptional stiffness with minimal weight.
  • Speed Lock Lite: Simplified transition mechanism with a single-action Dyneema® cord.
  • BOA® Fit System: Micro-adjustable precision fit.
  • Vibram® UFO Sole: Durable, cold-weather grip.


589g in 41.0

Shell Material


Cuff Material



SCARPA® Race 3.0 SL (Intuition)


Very stiff (!)

Forward Lean

9º-13º/ 11º-15º

Range of Motion

Unlimited (pretty much)

Buckle Closure

Boa closure + Cord/Lever combo

Binding Compatibility

Tech bindings only

Last Width

99 mm

General Fit

Narrow general last, shallow instep height and narrow to average heel

Boot Sole Length

276mm in 41.0


Winning races

Bottom Line

The ultimate skimo boot?
Returns and Exchanges

For a full refund, items must be returned within 30 days of purchase.
Sale items are not eligible for returns.

No extended discounts on previous purchases.Gift cards are non-refundable.

For more information on returns and exchanges, click here.