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Model: Alien RS
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Price: $869.95
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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 "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.
-> 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.
Question from Steve
Hi SkimoCo,

I measure a 26 in length and was fit into a 27 boot. After about 6 days the boots have become quite sloppy in fit. What liner would you reccomend to take up more space than the stock?

Answer from Teddy Young
Hey Steve, sorry you're having to deal with a sloppy fit there! While it isn't an ideal solution to take up volume with a thicker liner, I might recommend the Palau Powertrack 10 for going that route. It won't walk quite as well as the stock liner and has a somewhat beefy cuff, but it should help fill the voids and offer a more secure fit!
Answer from Minot M
Steve...I have a brand new pair of 26s if you want to swap. 26 is too small on me.
Answer this question:

Question from Kurt P
fit relative to the older all yellow Alien? I was sort of between a 26 and 27 in those boots. big foot measures 272mm. low volume and a true D width.
Answer from jbo
Hi Kurt, the RS is a bit longer in the same size. But, like the original, the boot is on the narrow side compared to a D width so it might feel small in the correct length. Based on your foot measurement, I would think the 26 is too small.
Answer from Kurt P
hmm ok. I tried a 27 in the original Alien, went to a 26. My toes were scrunched on those but the rest of the boot felt good. Looking at BSL between the 2, the RS seems a bit longer, no?
Answer from jbo
Hi Kurt, yes it's a bit longer internally (which is not necessarily indicated by BSL). The Mondo scale is essentially your foot length in cm, so seeing as you measure over 27cm, 26 seems small on paper. Measurements aren't the most accurate fit approach though as there can be variables with footbeds, sitting vs standing, etc.
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Question from Eric
I've been using TLT6 first edition in size 27.0. My big toes gets pretty damn hurted on long days because of the boot lenght which is too small so i would fit better with 27.5 tlt6. They still works great while strictly ascending.
Which size do you think would fit best for me? 27.0 or 28.0? I ski a lot of long days on flat mark before reaching the mountains, so i hate when my toes hit the front wall of boots.

Answer from Trace Leches
Hey Eric! There are a ton of metrics that will make or break a proper fit, but based on what you said I am thinking you'd be a far better candidate for a 28 than a 27. Fill out our boot fitter if you'd like a more in-depth analysis of the fit and if this would be a good boot for you!
Answer this question:

by boris d (used product regularly)
Just wanted to add a few observations regarding the fit of these boots. Enough was said about ski performance and I'm not a ski expert to add much on this subject.
It was an emotion-driven purchase. My beloved LS Syborgs all of a sudden turned into torture device when some kind of bony protrusion grew on my foot and it gotten really painful after only a few hours of touring, especially when in a ski mode. I went to the ski shop to try to do something about, saw Alien RS, put them on and pulled out my cc!

It's been a little tight at the forefoot first few outings but then it went away and now the boots are really comfy! I had the liners molded but frankly I think the fit improved just from usage. Anyway: my feet are old, medium width, pretty wide at the toes but these boots fit great! I probably went with 1/2 to 1 size too large so the fit is not "performance fit" but they ski great for me and very comfortable. No hot spots, no blisters, nothing! Maybe I should try a foot-bed to take up some of the slop but maybe it's like trying to fix what's not broken?

A few other things: crampon fit with my crampons that I assembled for Syborgs from several different parts is awesome! BOA adjustment is fantastic, super easy to tighten and you just pull the knob and it loosens. The gaitors have no zippers to break. Liners seem thicker and way warmer compared to Syborgs. It's really easy to put the boots on which is kind of nice when you are on a multi-day tour! I'm in love with these boots but let me point to a few negatives:

Ski/walk mechanism is way harder to work compared to Syborgs. You need to bend back to reach the lever and it may take a little fiddling. Really no big deal and I'll probably learn to do it quicker with time.

As others pointed out, the cord for tightening gets frayed pretty early and the cord slips through the locking fitting when tightened hard. A knot on a cord would probably solve the slippage problem.

I'll add other negatives if I could think of anything else.
Comment on this review:

by Anthony O (downright abused product)
Pros: Light-very stiff for weight. walk range is great, similar to other race style boots. Boa is great for easy adjustments. Love the simplistic single throw for switching to ski mode. Tread is very durable. I have only skied race style boots, I've never skied an alpine boot, but comparatively this is the stiffest boot i've used. I have no problem on 100mm waist skis with this. Wouldnt hesitate to use on 105s, but I am a balance skier, I dont drive from the cuff.

Cons: Durability of gaiter pulls-ripped off pretty early while sliding a liner in. Cord that also serves to put the boot in ski mode also visibly is frayed after about 50 days and also slips through the cam lock. Like others I have just tied a knot so that it will not slip through. I have also found the single throw latch to loosen over time, requiring occasional tightening. I am also concerned about the stress on the small cam lock from the added knot, though I havent noticed any issues yet. I also do not like that the sole is very flat. Comparatively to some other brands, there is almost no rocker, so even though ankle ROM is huge, the "naturalness" of the walk is impeded by the flatness of the sole (though that may be preference). I also question the use of the carbon infused grilamid throughout the entire shell, I will explain in the fit notes.

Fit notes: very narrow toe, not anatomical shape. symmetrical rounded pointy ish toe (never seen anyone who has feet or toes that look like the toe box on this) Fairly low volume. My foot measures a 27 but I have to do a 28 in this and its still too tight for my width. The heel and midfoot are wider. I personally have a wide forefoot and narrow heel. This boot is too tight in the toes and too sloppy in the heels for me. I had to add a lot of foam in order to get good heel hold on this, I also had to add a foam shim to the shin area to held with heel hold. Because of the very specific fit of the boot, it is even more limited because of the carbon fiber infused grilamid. This material is stiff, but is extremely difficult to punch. And Scarpa doesnt approve of punching it (voids warranty I believe). I have had mine punched but compared to normal grilamid I was much more limited in how much I could punch it. So if your normal practice is to downsize shell and punch it out, or have a suboptimal fit and modify it, the potential for modification is very small. Even after punching I didnt have enough space in the big toe area so I used a razor to cut out a couple mm from the inside of the liner by my big toe. This boot should work for you if you have a narrow forefoot and in general low volume feet. Talk to the guys on this site, they will steer you in the right direction as far as fit. If you have average, wider "american" feet, my guess is these will be a tough fit out of the box and may not work.

Notes to Scarpa: You know what most people's feet look like, as evidenced by the Maestrale, and other mountain boots, like the Mt. Blanc or the new Ribelle or various other boots. Why do you change the last for "race" boots? Not all people who like to race suddenly morph the shape of their feet. Also, if you are going to make a very specific type of fit that doesnt work for a lot of people, at least make the lower part of the shell out of an easily modifiable material like normal grilamid so that those of us that dont have small elvish pointy toes can have a solution for fit.

Ultimately I will keep the boot, unless someone wants it, but I cannot bare it for multi-day or very heavy mileage days. But if I want high performance skiing or dont plan on a super long day I may take them, but usually comfort wins out for me, so these may be collecting dust for me now. Still an excellent option if it fits you, definitely try in store before purchase.
Comment on this review:

Question from Bruce A
Is there a cuff cant on this boot? Thinking no, but somewhere I thought I read a review that mentioned a cuff cant.
Answer from Trace Leches
Hey Bruce! Nope, no cant cuff! They went light and burly with this one!
Answer this question:

by Pete (used product regularly)
Got these at the beginning of the season and have pushed them hard, what an amazing upgrade from my old TLT 5 Ps. Scarpa seems to advertise this as a race boot, but I don't think this is the case, not quite light enough, the ankle articulation isn't quite there, and there is much too much resistance pushing the boot through the articulation for it to be called a true race boot. I think skimo.co makes a good distinction by calling this category "race-plus." Boy for the weight does this boot ski, easily equal to my old TLTs, in my opinion everyone between freeride shredders and racers should be zipping around on these.

Sizing is tighter and narrower than most Scarpa boots, I'm commonly a 27-27.5, I chose a 27 in these, they fit quite nicely but it's definitely a performance fit.

Gaiter is amzingly thought out, and I love that they added a clip for binding tethers. My only complaint is that the cam device used to adjust tightness of the upper eats at the dyneema cable, hasn't failed yet, but is visually core shot. A thought as to how Scarpa could make these better is by using a full carbon upper, retaining the carbon grilamid lower and lining it with weave as in the current 1.0, this would make the boot considerably stiffer and lighter without compromising durability of the lower for scrambling. Perhaps the new 1.0 will fill the ticket.
Comment on this review:

by Mark E (used product regularly)
These Alien RS boots ski astonishingly well for as light as they are. The innovative Boa and upper cuff tightening systems provide for something that feels a bit like a four buckle design in a 2 lb boot. I have fifty days or so of skiing in these boots, and a couple days of ice climbing. No concerns or complaints about durability. Scarpa suggests that these boots are best for skis 85mm or less. I ski these on 84mm skis, but feel that they could comfortably power a bigger ski. A ski partner skis these boots on 95mm skis without complaints.

The boots are a little tight in the toe box, and fit a little bit short. I usually ski a 26.5 ("performance fit") boot, and my size 27 Alien RSs are barely big enough (I have a footbed in the boots to raise my arch and shorten my foot a bit).

Not an ideal boot for ice climbing. The offset toe welt does make the boot natural to walk in and tour in, but might require you to bend your crampons' toe bails to get a snug fit. The ski/walk mode arm interferes with the heel clip on most crampons, meaning you'll need to loosen your crampons to switch between walk/ski mode.

The boots are comfortable and dexterous enough that I have no difficulty driving my manual-transmission Subaru in the boots, and often find myself running errands in town on my way to/from skiing in the boots.

This is a perfect boot for ski mountaineering and any sort of long distance touring. If your objective is moving quickly and confidently on snow in the backcountry, I'd suggest that the Alien RS is a perfect boot.
Comment on this review:

Question from Peter D
Hi there. Was wondering if the Aliens RS can be punched. Of course Scarpa states against that and it would devoid the warranty. Currently skiing 27.5 Dynafit Beast with a small punch for my right foot bunion. Tried the Aliens RS in 28 and got a really good fit except a pressure point in the bunion. It might go with liner molding, but it did not in case of the Dynafits. I would probably need couple of millimeters punched, do you think its doable?
Thanx for advice Peter.
Answer from eric
Peter- Yes the punch would void any warranty on this boot. That said, there is some capability depending on where on the boot it needs to be modified.
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Question from Jeff
I wear a 27.0 in the new Maestrale RS 2.0. What size would that be in the Alien RS?
Answer from jbo
Hi Jeff, SCARPA uses similar lengths across their line of boots, but the widths can vary. The Alien is noticeably narrower than the Maestrale in the same size, but about the same length.
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Question from James O
Has anyone managed to get shorter leashes (like the Dynafit Guide) to work with this boot? I can't find any suitable locations to clip into. I realize the around-the-cuff long B&D brand ones are an option, but I'd like to use something shorter if possible.
Answer from Trace Leches
Hey James! Yeah, totally! I actually use the exact combo you're mentioning. There's a small d-ring riveted into the upper shell that you can girth hitch the steel ring from the Dynafit Guide leash into!
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Question from Erik
Can't quite get used to the 13° max forward lean on these boots. Looking at the clamp in the back for adjusting the forward lean, it looks possible to modify this to get a couple of more degrees in (drilling to offset the holes).
Any ideas if this mod has been done before?
And is it just me, or is the forward lean accually not quite normal on these boots?

Best regards!
Answer from Trace Leches
Hey Erik! Not sure if it's actually been done before but I've had this talk multiple times, including with myself. The forward lean isn't quite where I want it to be either. A less permanent (and potentially warranty voiding) solution would be to put some foam on the back of the cuff of the liner to just bump your lower leg a bit further forward. We've done that many times on these boots before to account for tiny calves or not enough forward lean.
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Question from Trevor J
Thanks for the boots. very well made and impressive in many ways :) what crampons work well with these? any crampon limitations with these boots that you've noticed?
Answer from Trace Leches
Hey Trevor! The Petzl and Camp crampons seem to work really well with the boot, but that's only if you don't plan on putting the boot into ski mode while front-pointing. If you plan on keeping the boot locked and front-pointing, use something like the Grivel SkiMatic 2.0 crampon that levers on via the toe.
Answer from Drew P
Camp XLC390 and BD Neve don't fit this boot at all, but the Grivel Skimatic fits it great!
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Question from Lars

I have the Gea RS 2.0 in size 23.0. It is quite narrow for my foot, and I have punched it twice (one time very little, the other time quite a bit). I do have aftermarket foot beds in them. How do you think an Alien RS would fit in size 24.0 compared to the Gea RS 2.0 in size 23? Perhaps the heel hold would be a problem?
Answer from eric
Lars, The first rule of boot fitting is to never go up or down a size shell to make the boot fit. Find the correct length of shell and it either fits or it does not. The Alien Rs is a much narrower boot than the Gea Rs. So if the Gea RS was to narrower than the Alien RS will be worse.
Answer from Lars B
Thanks for your answer! Do you have any suggestion on what to look for for a more wide fit in this segment?
Answer from jbo
Hi Lars, you may have a few options. Best bet is to visit our boot fitter to find out.
Answer this question:

Question from Troy
Does this boot actually have a zippered gaiter? I tried on a pair a couple of days ago and I didn't notice a zipper but now I am seeing a zipper in your photo and a zipper is mentioned on the Scarpa website (as well as your website). Thanks.
Answer from jbo
Hi Troy, the prototype model had a zipper but it was removed for production. Sorry we don't have an updated photo yet, but that is about all that changed.
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Question from anthony
hey, I've had about 15 days in the alien rs in a sz 28. I love them, but I got quite a bit of slop in the fit which I am fairly comfortable skiing with, however I would like to get a different liner to suck up some of the void space. I find the fit around the toes to be narrow and tight (I have a felted superfeet wool insole inside right now) but I have a large amount of heel lift and movement around the calf. I have a 2 finger shell fit at the end of the day of skiing. In conjunction with perhaps some insole shims what liner and thickness would you recommend? Without knowing much it appears like either the powertrack 10 or ultralight performance liners in 7mm may be best? As stated my biggest issues are with heel lift and space around the shin. What are your thoughts (I know its not ideal to give fit recommendations online but im quite a few states away from you guys and have bad experience with some local fitters)? As always, thanks, you guys rule!
Answer from Nate
Hi Anthony, it's a bummer to hear that you are struggling with the fit of your boots. I've fit the Powertrack 10 on a number of customers, and tried it on for my own fit. I think it will be too tight of a fit in the toes for your Alien RS. The 7mm Ultralight Performance liner will likely be too thin.

I have experimented a little bit with the Intuition Pro Tour MV liner in the Alien RS and have found that it could be a workable solution if a person is dealing with too much volume in the calf and heel. You might try that in a size 28. The other option that may work is the Palau Tour Lite Performance liner in a 28, it's a touch thinner than the Intution Pro Tour.

If you haven't already, I'd also suggest making sure you are pulling the string nice and snug before flipping the lever in to ski mode. I've noticed that getting the string tension tight helps to clamp down the lower over the instep just enough to eliminate some heel slop.
Answer this question:

Question from Kamil
Hey. I had a Dynafit TLT7 performance boots, but "I" destroyed them ;D I am now considering scarpa RS. The stifness is a priority, not the weight. Speed turing, all day turing, races time to time. Anyway a lot of guys told me to get new scarpas. My question is what is the sole width of these two? tlt7 performance and scarpa rs? Looking forward to hearing from you! :)
Answer from Trace Leches
Hey Kamil! Oh no, that doesn't sound good. The Alien RS sure is a stiff boot. I'd say it's about on-par with the TLT7, but the TLT7 is a bit more progressive whereas the Alien RS kind of hits a wall with the forward flex. The last width of the Alien RS is a pretty narrow 99mm and Dynafit doesn't publish any of the last info but the TLT7 is high, wide, and on the opposite end of the fit spectrum as the Alien RS. Visit our Boot Fitter Program if you'd like to proceed with a fitting.
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Question from JJMS
Quick question on sizing. I'm a pretty comfortable size 27 (a bit on the small side) in a scarpa alien 1.0 (regular non carbon). I'm hearing that the Alien RS fits a little more snug and was wondering if I should be sizing up to a 28 on the Alien RS. I know it's hard to say without seeing the shape of my foot....
Answer from jbo
Hi JJMS, in general you shouldn't have to size up (and you'd want to look at other boots before doing that). The RS liner is thicker but it also molds really well.
Answer this question:

Question from tryggve
hi skimo! can anyone compare skiperformance between these, fischer traverse(carbon or non carbon) and the tlt5 m? i have skied the tlt5 m(without tongue) for many long dark cold swedish and norwegan winters now,and tried the alien rs and fisher traverse on in a shop,but have a hard time leting go of the tlt5.my tlt5 is super old with almost no sole left and i was expecting to realy want the other boots when trying in the shop,but now im not so shure.is it realy realy such an upgrade regarding the downhill performace? i ski an old colorfull 180 vector,listening to norwegan black metal, have the same clothes for ten years so maby the tlt5 sould just stay me forever?
Answer from Trace Leches
Hey Tryggve, thanks for reaching out!

First of all, Norwegian Black Metal? How can I start listening to this? I like your style, I think new gear may cause a singularity to appear.

The Alien RS is a fantastic boot, but so is the Travers Carbon. I'd say if you're looking for a new boot in this sub-1000g range you'd be wise to start with the Alien RS based purely on fit, however Scarpa has announced that they officially only want to see the Alien RS skied on anything up to 85mm underfoot, so based on that guideline you'd likely have better success with the Travers Carbon. That being said 85mm underfoot is well within the Alien RS's limits and it's capable of driving a much, much larger ski than that. The Travers Carbon is an interesting boot that behaves fairly similarly to the Alien RS and with a bit of work you'd likely be able to get the width and volume to work for you.
Answer from tryggve
o, you just start by listening to early darkthrone, like the song snowfall or land of frost.but remember alsow listen to other music, its like skiing, only hard windpack or ice is hard for legs, at least i need to mix it up with some crust or rockskiing sometimes. so mix darkthrone with maby antony and the johnsons or aphex twin or patti smith.
i will go with alien rs when my tlt5 turn to microplastics. i think alien rs will be verry fine with skis wider than 85 mm, im light on my feet, in many ways!
thanks for your answer and happy skiing!
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Question from Fred
I fit comfortably into a 31.0 Maestrale. Any chance of fitting into a 30.0? How much shorter is it?
Answer from Trace Leches
Hey Fred! That's a super broad question to answer without knowing any finer details but the short answer is: Probably not very comfortably. The size down will be 1cm shorter internally (equates to about 1 finger thickness). If your Maestrale is a performance fit you'd have a very hard time getting the size down to work. If your Maestrale is big then there's a better chance of getting this to work.
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