Skimo Co

SCARPA Alien RS Boot

$869.95 $629.95

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Every so often a company will debut a category-shattering display of engineering that seems to break all kinds of rules, defy stereotypes, and spearhead a new generation of skiing. Behold: the Alien RS. Holding true to the da Vinci mantra that "simplicity is the ultimate sophistication," the Alien RS is a delightfully simple boot. A stiff carbon-infused Grilamid cuff is mated to a stiff carbon-infused Grilamid lower by way of an unbelievably dexterous pivot that again, defies stereotypes. A Boa closure on the lower shell wraps around your foot to create a secure and precise fit. Racers, say hello to your new everyday boot light enough to sneak in 40,000ft of dawn patrols per week; freeriders, mountaineers, and steep skiers, say hello to your beefy race boot capable of taking you further than ever before.

  • Carbon Grilamid LFT Shell and Cuff blend industry-leading power-to-weight ratio with industry-leading price.
  • Lower Shell is built around a 3D Lambda Torsion Frame to increase lateral stability and power transfer.
  • Speed Cam Lock ski/walk mechanism is reliable, durable, and precise.
  • A waterproof, zippered gaiter tempts snow to even try to get into this boot.
  • Offset toe lugs promote a more natural walking motion to increase touring efficiency.
convert to ounces
920g [27]
983g [28]
Weight (pair) 1840g [27]
1966g [28]
Buckles   1 + BOA, Single Throw Speed Cam Lock
Boot Sole Length   270mm [24]
278mm [25]
286mm [26]
294mm [27]
302mm [28]
310mm [29]
318mm [30]
Binding Compatibility   Tech Only
Cuff Rotation   72°
Forward Lean(s)   7°, 9°, 11°, 13°
Specs Verified Yes
Materials   Carbon Grilamid LFT
Liner   Intuition Cross Fit Tour
Sole   Vibram UFO RS
Skimo Co Says
Usage Speed touring, high performance ski mountaineering, exceeding expectations
Notes Grilamid infused with long strands of carbon fiber increase torsional stability and precision. A zippered, waterproof gaiter invites you to use your imagination when accessing lines
Bottom Line If the Holy Grail was a ski boot
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Questions & Reviews

Shaun Greene (used product regularly)
Not a very reliable boot for everyday use and abuse. BOA has broken a couple of times now, the fasteners that hold the BOA in place have broken twice now, the guides the BOA run through within the boot have broken in 2 places. I go out on these boots never quite knowing what is going to break next. Scarpa's customer service is extremely difficult to deal with as well. If you are looking for a light part time use boot this will probably work. If you are looking for something to use with regularity you might want to consider something more sturdy. Not sure I will ever own another Scarpa product due to the their poor customer service. Lots of these on sale for great prices right now but be aware they do have their flaws.
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Question from Boris D
I've had this boot in size 29 for several seasons and by now developed a deep and perhaps slightly unhealthy attraction to this item. Just yesterday, for fitness training, I booted over 6K vertical feet and it was way better than hiking in my regular hiking boots!

Question: what should I use for a replacement liner? I love the original Scarpa liner but it can't last forever and the Scarpa replacement liner is unavailable. What's the closest? Thanks.
Answer from jbo
Hi boris, we have the replacement liners available here (Cross Fit Tour).
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Alex (downright abused product)
Great boot that worked well for me as a daily driver in a continental snow pack and a 95-102 wasted ski. If your not worried about dialing in the stiffness just right at every transition, the ease of boa and walk mech tightening is pretty great. They are a little narrower than the F1 last and I will admit that after I had put a few seasons on them I dropped a F1 liner in them to give them a little more stiffness but if you can race 1 day and then drive your daily driver the next with the same boot, that says something. SCARPA says that you shouldnt ski fatter skis with these but Ive seen a good skier drive 130 wasted Voile Drifters many days without issue.
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Question from Jordan
I wear a 26 in Alien 1.0 (279mm). Do I wear a 25 (278mm) in the RS? Or the longer 26 (286mm)? Is this a longer boot?
Answer from jbo
Hi Jordan, you would still be a 26 in the RS. It does have a longer boot sole, but that doesn't equate to internal length.
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Trevor J (used product regularly)
Really an impressive boot. feels more like a shoe than any boot I had had. Great performance on almost all snow. On Rock hard crud it begins to show its limitations. Fits perfectly into my "quiver" of boots as the lighter of two. Thanks for the great boot.
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Jeff mikaelian (downright abused product)
I didn't really need to wait so long to review. Have been using for over a year, I knew they were the boot for me before I bought and have lived up to it every day. I am lucky that I fit Scarpa length perfectly and have a narrow with no issues foot.
Performance - They are plenty stiff, yes they don't have a very progressive flex but I quickly got used to them and isn't a thought anymore. Skiing powder is not a problem for my daily 100mm ski. And to the chagrin of Scarpa, I can drive my bigger powder ski.
Walk mode- no need to discuss, they are awesome. Hiking is so much less a chore. The ski/walk mode is excellent as is, hate to see it go. I can easily flip open and close with my ski pole. No bending over and messing with buckles and powerstraps. The cord slipping doesn't seem to be an issue for me and I do have it knotted. If you are one who really cranks buckles and power straps, you may not like, but for me, no problem
Durability-zero problems to date. I believe if properly fitted, and I have custom footbeds, you do not need to tighten the BOA much. For the majority of people, the BOA hasn't been an issue. Same with the cord, I don't overtighten and I don't even have any fraying yet. There does seem to be some wear points between the shell and liner. I have been trying to use the patches on the shell and tape to keep ahead of it.
From powder to suncupped summer snow I couldn't expect more from these. And seriously thinking of getting another pair before they become the LT
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Question from Shane K
Do you guys know if the BSL of the new F1 LT will be more like the Alien RS or F1? I see that's it's not a huge difference anyways and could just adjust my bindings. Just curious. Thanks!
Answer from Cole P
Hello Shane, the lowers on the F1 LT are almost identical to the Alien RS, and believe they will be similar if not exact to its BSL.
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Marcos (used product a few times)
Finally bought the boots!!! Just use them for a couple of days before returning home. On the uphill they have wings!!! Didn't have the oportunity to try them in a descent powder day yet, but so far happy on the downhill.
Had to tie a knot on the dyneema cord, the stopping mechanism kept losing tension.
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Question from Marcos
Hi, do this boots work with marker kingpin bindings?
Answer from TSB
Hey Marcos, unfortunately they do not, the overhanging shell plastic above the heel lip interferes with the alpine-style heel on the Kingpin. For a lighter boot that fits nicely with Kingpins, check out the La Sportiva Skorpius.
Answer from Marcos
What about the La Sportiva Sytron or the Dynafit PDG 2? The LS Skorpius are over my kilogram per boot limit...
Answer from TSB
Hey Marcos, you are unfortunately out of luck if you are looking to pair a sub-1kg boot with an almost-1kg binding. The Skorpius is your best bet for weight-to-compatibility ratio (it's even compatible with the mythical Ski Trab TR2 binding).
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Question from Albert
The comments thread indicates that the Alien RS will be discontinued after this season. Can you shed any light on this? I’ve been using the Maestrale RS/ Alien RS as the boot quiver and find it to be a fantastic combo. Hope that the Alien RS sticks around!
Answer from TSB
Albert, c'est vrai, the death of the Alien (RS) is imminent! Upon its discontinuation we plan to send a ceremonial pair out upon the Great Salt Lake in a boat assembled from Scarpa boot boxes, Grilamid-infused cannoli shells, and empty bottles of grappa. Stay tuned for Scarpa's next iteration in the "race-plus" category, though, which we hear will be an exciting blend of tradition and innovation, racing and touring, passion and temperance (and, supposedly, will have the same lower fit as the Alien RS).
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Lane A (used product regularly)
I got these boots thinking I would use them for long tours in the Cascades paired with Voile Objectives. They are certainly light and go uphill very well, but I think I had unrealistic expectations for the downhill performance. I'm sure they are good for the weight (I haven't skied other boots in this weight class), but don't expect them to be much fun in difficult snow conditions. If you ski nice light snow with a conservative style then they will do great. I usually opt for a heavier boot and bring these out for climbing focused objectives where skiing is more of an efficient way to get down than the main goal. Great boot for what it is, but don't expect a miracle. They make a lot of sacrifices to get a boot this light.

A few notes:
- Cord closure requires a stopper knot to prevent slipping which makes it difficult to dial in the tension or adjust throughout the day. The knot wears down one section and will probably break the cord eventually, but it looks easy to replace.
- Fit is much narrower than other Scarpa boots. All other Scarpa boots I have tried are way too wide for me but these fit well.
- Booster strap can be installed by drilling a hole in the back of the cuff. This helps the downhill performance a bit. I haven't broken the cuff yet, fingers crossed.
Reply from TSB
Hey Lane, thanks for your review! We haven't seen an epidemic of broken cords due to wear, so I wouldn't be too concerned (though it never hurts to pack an extra for those monthlong American Alps traverses). On the other hand, the power-strap mod is fully endorsed by ski tourers north and south (though it voids the warranty, of course).
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LCC Skier (downright abused product)
The Alien RS represents a huge step forward in the world of ski touring equipment. They are very lightweight, have excellent cuff articulation, and they ski very well. Full stop. Although they do take some getting used to, once you are familiar with the way these boots ski I do not see why you couldn't drive a fairly large ski at decent speeds. I highly recommend tuning the forward lean to suit your skiing style and going with as aggressive of a fit as is comfortable (you need a medium to narrow foot with high volume).

I will attempt to address few of the concerns many people seem to have about this boot. First, “it isn’t going to be warm enough on cold winter days”. In my experience, this boot is adequately warm for most very cold days (single digits F) especially when you are moving fast, and this boot should inspire you to do so. Second, “this boot isn’t going to be durable or reliable”. This boot is like many other ultra-light pieces of gear, I wouldn’t advise wailing on it. I did break my right cuff about an inch above the pivot while skiing one day, luckily Scarpa replaced the cuff for me in a (somewhat) timely fashion.

The Alien RS will become an absolute cult classic of a ski boot. Much like the TLT-6. Its performance greatly outweighs its mass, and I think that is the idea with most of the gear on this site. Get yourself a pair before they are gone. -Scarpa is canning the Alien RS for next season… :(

(Full disclosure: I did not but these boots from but I really like this site and I think this is a great place to post and read reviews.)
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Question from Nicholas B
Do you think this boot would be able to reasonably drive something like the hyper V8? That seems like a big ski, but I just realized it's a pretty similar weight to the standard v6, which does seem like something more in the wheelhouse of this boot.
Answer from TSB
Hey Nick, thanks for reaching out! The Hyper V8 is definitely designed for a slightly beefier boot than the Alien RS, but if you're mostly aiming to spoon low-angle powder turns, it's not a totally outlandish combination. The Alien RS is impressively stiff in the lateral direction so you'll be more than capable of getting onto your edges and turning the ski from a balanced stance -- more hip wiggle and less knee drive, if you will. You may want to mount a little forward of boot center to compensate for the more upright stance of the Alien RS, and of course be aware that you void the warranty of the boot by skiing it on anything over 85cm at the waist.
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Greg (used product a few times)
Just got a pair of these in a 30. Have put 2 days in then and am very disappointed in how sloppy they fit. I probably should have sized down, but then I’d have to punch the toe to make them long enough (2 separate bootfitters agreed). I have a pretty low volume foot and these things just have tons of heel lift, side to side, and up to down play in them. I’m literally swimming even with the Boa maxes. I’m going to try high volume footbeds and foam padding but short of that I’m afraid this boot just won’t work for me.
Reply from jbo
Hi Greg, sorry these boots aren't working for you. We don't recommend them for very low-volume feet. Next time you're in the market, please consider visiting our boot fitter and purchasing from us!
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Colby (downright abused product)
When it's working this boot is working right, doing what it is designed to do, it does it really well. It is stiff and can ski big, heavy skis fairly well. It's light and has great articulation. The lever/tightening mechanism works well and I have not had a problem with the cord.

However, it's also not super reliable in the field. I have broken the boa system a couple times, and while this isn't a deal breaker, it can be annoying to ski and hike with a loose lower, and it is a big pain to put a new cable in. The bolt that goes through the lever is a bit too short and the nylon on the lock nut doesn't quite engage the threads. I've lost the bolt while touring and almost lost it a couple other times when I realized the nut was going. Skiing out without being able to lock the upper boot can be quite grim. Finally, I've had the gaiter start separating near the cuff after only one season. I'm not sure how I'm going to fix that.

As others have mentioned: these boots are narrow and punching them would void the warranty. They are also a bit small and I would size up.
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Nat (downright abused product)
Hands down the best skiing boot I have ever used in this weight category. I use them with Voile Objectives and Helio 95's and they drive both skis very well. So light! And so easy to use. I think they're total game changers. Over the past 2 seasons I have put approximately 80 days on my Alien RS's and they are holding up surprisingly well. I have yet to have anything break or really fail. I do carry replacement / backup Dyneema cord but am still going strong on the originals. I also keep an eye on the walk/ski mode bolt and put some blue loctite on it for piece of mind. I expect to get another season or two out of them for sure!
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Question from Keith K
Hi, I wanted to know if this boot is compatible with Salomon/Atomic Shift bindings?
Answer from Jeffrey
Hey Keith!! No they would not. The toe is not a full DIN toe to work with a Shift binding. Pretty much only the 'Beef' boots at the bottom of our page of boots will work.
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Question from Beat Bischof
Is there a woman version of the Scarpa Alien RS Boot?
Answer from Jeffrey
Hi Beat! No, this is a unisex boot. They have a narrow last and a bit taller cuff. So if you have a low/large calf, maybe not a good fit.
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Question from Dave E
I skimmed through and saw lots of comparisons to other boots, but not to Alien 1.0. . . maybe I missed it.

So questions:

1. Does this boot ski as stiff as 1.0? If not as stiff, is that in a good way (like smoother flex closer to TLT6 vs the stiff brick wall of the 1.0?) or is it just flimsy like the original plastic alien?

2. The 1.0 has a fixed cord that you adjust by re-tying the knot and this boot looks like it has a cam to adjust more easily. When I have climbed vert ice with my 1.0, it seemed to work really well unbuckled but I wonder if the on-the-fly cuff adjustability of this boot would be a benefit climbing ice to get a little more cuff support and decrease calf fatigue?

3. Since this boot seems to have a more conventional liner, do people feel like it walks as well as the 1.0 or does the liner inhibit range of motion somewhat?

4. Lots of comments about durability. . any comment from Scarpa about changes or improvements next season?
Answer from Jeffrey
Dave, lets go through point by point:
1. Scarpa rates them 95 RS and 100 for the 1.0. But they are very different boots, the 1.0 is a Race boot with a stiff carbon cuff. The RS has been much refined from the original Alien to a race light touring boot. Forward flex is not flimsy and is considered by many to have the best downhill performance for a boot this light.
2. The cam is a nice touch, but still recommend tying a knot.
3. Range of motion is still excellent in the RS. New liner does not seem to restrict.
4. No announced changes next year, just adding a size 31.
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Question from Josh C
Hi Skimo folks,

The lean lock/locking lever screw keeps falling out. I lost one touring and one simply on the approach (hiking with the boots on my pack). I know this is a well documented problem but didn't see a solution mentioned after a quick scan through all the comments. I've about had it--and Scarpa customer service hasn't helped out by sending new screws despite several emails to them. I imagine you guys have a good work-around? Do you just recommend a screw from the hardware store with a locking nut? Any better suggestions? I almost thought I'd just put a ten-penny nail through it and bend it over but there has to be a better-engineered solution. Thanks.
Answer from Teddy Young
Hey Josh, I’m sorry that Scarpa hasn’t been getting back to you! Thankfully, a standard stainless steel bolt and locking nut from the hardware store are a sufficient fix here.
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Model: Alien RS

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