Skimo Co

Certain inventions are acknowledged as the peak of human innovation and excellence. Fire, democracy, the automobile, and now, with the addition of the Scarpa Alien 4.0, that list has grown. Coming off the legendary platform from the Alien 3.0, the new Alien 4.0 has made minor improvements for those who like to go uphill fast while having a stiff and reliable boot on their feet. With an updated free-floating Boa® dial taken from similar boots in their line up -F1 LT, Alien 1.1, and the Alien RS (RIP) - one can expect slightly better fine-tuning adjustments from just a rotation of a dial. Scarpa has also updated the new 4.0 by permanently adding foam on the upper cuff for better comfort and less fiddling right out of the box. Because speed means safety in the mountain (as well as a podium finish), Scarpa has stuck with the Speed Lock Lite ski walk lever for single motion transitions along with Spectra cord that is easy to adjust while still offering a stiff and durable upper cuff attachment. Scarpa has stuck with Vibram UFO under your feet which equates to solid traction on a mixed bag of terrain and excellent durability. The rockered sole gives it a near trail running shoe performance. For fast and light days where weight, skiability, and range of motion are essential - the Scarpa Alien 4.0 is now the “Ferrari” of full carbon ski boots.

  • Dynafit Quick step instep inserts are fast and reliable.
  • Updated free floating BOA, allows for better overall fine-tuning precision and better heel retention.
  • Full carbon construction for the lightest boot option that Scarpa can offer.
  • Scarpa Race 4.0 liner offers a great full range ankle articulation for a long fluid stride, as well as excellent thermos-moldability.
  • Vibram UFO 4.0 outsole for near running shoe performance and maximum grip and durability on varied terrain.
  • 76 degrees range of motion allows for the most efficient stride possible.
  • Speed Lock Lite System is about as good as gets for a fast and reliable single motion transition.
  • Vegan.
  • Made in Italy so you know it must be good.
convert to ounces
Weight (pair) 1220g
Buckles   Boa lower / Dyneema cord with single throw for upper
Boot Sole Length   260mm [39]
268mm [40]
276mm [41]
284mm [42]
292mm [43]
301mm [44]
Binding Compatibility   Tech only
Cuff Rotation   76°
Forward Lean(s)   9°-13° / 11°-15°
Specs Verified No
Materials   Carbon fiber
Liner   SCARPA Race 4.0 SL
Sole   Vibram® UFO 4.0
Skimo Co Says
Usage Racing, training, speedy touring
Notes Padding added to the cuff to lessen the fiddle factor
Bottom Line Winning races 4.0

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Model: Alien 4.0

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