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  • Arc'teryx - Acrux AR GTX Mountaineering Boot - Black/Cajun
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  • Arc'teryx - Acrux AR GTX Mountaineering Boot - Black/Cajun

Arc'teryx Acrux AR GTX Mountaineering Boot


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    • US 7.0/UK 6.5
    • US 7.5/UK 7.0
    • US 8.0/UK 7.5
    • US 8.5/UK 8.0
    • US 9.0/UK 8.5
    • US 9.5/UK 9.0
    • US 10.0/UK 9.5
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    • Black/Cajun

    8 Reviews


    Stop blaming your boots.

    It's easy to get cold feet, literally and figuratively, when you're pressure breathing your way through the crux of a sketchy mixed pitch at 4,000 meters, but worrying about your toes is the last thing you want to do when complete focus is required. Arc'teryx's Acrux AR GTX Men's Mountaineering Boot is a seriously waterproof, light, and low-volume piece of alpine footwear that will keep your feet dry and help your head stay focused when things are getting serious a long way from anywhere.

    Made to provide a sleek fit that won't bog you down, the Acrux is also drier than a desert thanks to multiple Gore-Tex laminates to keep snow, water, and ice out of your socks, without making your feet sweaty, either. The waterproof zippered gaiter is composed of a three-layer Gore-Tex membrane and treated with a TPU coating for supreme waterproofing, and the removable PE foam liner also has a full-height Gore-Tex membrane for ultimate protection in rugged weather. The liner is perforated to increase breathability, and it's designed to be worn alone as a camp bootie when you're shuffling around the hut or trying to keep your toes warm in your tent.

    Inside the outer boot, a lace-up inner shell cinches down snugly over the removable liner to lock your foot comfortably in place, and a hook-and-loop strap closes over the ankle to prevent snow, ice, and spindrift from sneaking into your socks. Arc'teryx also built the Acrux with its tongueless Adaptive Fit design, which hugs your foot without pinching or causing pressure points. The carbon fiber and EVA foam midsole cushion your soles during long days in the alpine, and the TPU toe and heel caps protect your toes and make it easy to step into crampons.

    • Zip-up gaiter with three-layer Gore-Tex membrane
    • Perforated 3D PE foam inner boot
    • Drawcord lace closure
    • Removable PE foam liner with three-layer Gore-Tex membrane
    • Tongue-free Adaptive Fit design
    • Carbon fiber with expanded PU foam core insole
    • EVA foam midsole
    • Vibram AR sole
    • TPU heel and toe counters
    • Item #ARC00I4

    Tech Specs

    Upper Material
    [membrane/laminate] Gore-Tex (3-layer), TPU laminate
    Gore-Tex membrane
    Removable Liner
    yes, Gore-Tex laminate (3-layer), PE foam
    [inner boot] drawcord laces, [lace cover] zipper
    Adaptive Fit
    CM EVA, carbon fiber
    Vibram AR
    double boot
    Crampon Compatibility
    step-in, hybrid, strap-on
    Claimed Weight
    [size 9] 2 lb 1 oz
    Recommended Use
    alpine & expedition, ice climbing
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Very tight boots, fit is very narrow

    • Familiarity: I returned this product before using it
    • Fit: Runs small
    • Size Bought: 10.5
    • Height: 5'7"
    • Weight: 150lbs

    These boots were insanely tight. The liners also don't have any means of loosening so they were nearly impossible to put on. With the right fit in length, the width was way too small. You'd have to have weird shaped narrow feet for these boots to work.

    Aconcagua Mountain.


    Aconcagua Mountain.

    I had the same problem on an alpine course I took last summer in the North Cascades. The snaps on the top cuffs were weak and had a tendency to pop open, which then allowed the zippers to start working their way down. I sent them back to Arc'teryx, and they replied that it is an issue. They're not able to repair them, though, so I have to wait until July for them to get my size back in for a replacement. They were remarkably comfortable for both summits, however, aside from the snap/zipper problem.

    Amazing boots!

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: 13
    • Height: 6'2"
    • Weight: 215lbs

    I have waited for multiple uses to properly write a review. Many critics stated that they are for narrow feet. I dont normally have super narrow feet, so I am shocked that these arguments are there. Def dont ignore it so try em on but they are snug and amazing. The liner makes this feel like an extension of your foot. Hiked, ice climbed, and maneuvered technical climbs all in one day without any blisters. The vibram sole is bomber. The outer layer keeps feet dry in full on creek crossing submersion. Just like ice climbing you heal doesnt move for some sharp edges. I did puncture the outer layer with a stray crampon but that was me being weak, tired and an idiot.

    One thing to note. Your feet will get stinky cause the heat gets soaked up in the liner. I didnt find my socks wet, but i found them stinky as all hell. To be fair from some rented Sportivas I have tried. I am ok with this trade off.

    On a non-technical note..... DAMN THESE BOOTS LOOK GOOD.... I got a lot of comments on em.

    All the good that they said it was

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: 11.5
    • Height: 6'0"
    • Weight: 165lbs

    I'm confirming all the positive aspects of this boot. However, this is the first rigid double boot I've owned. Many reviewers mentioned it is narrow; or rather fits a narrower foot. My foot is slightly narrow, so based on reviews, I bought a full size larger (11.5) than street shoe (10.5) and this worked excellent. It is still very snug on the side, gives ample room for toes, and room for an extra thick sock, or 2 pairs of medium weight socks. I can cinch the laces, and Velcro strap and have secure heel without movement.
    I bought these 2 weeks before two ascents in Ecuador: Cayambe - 18,900 and Chimborazo --20,200; 6 hour and 8 hour ascents. Excellent control and moderate weight of the boots was appreciated. I wore liner and one medium weight sock. No cold feet at all.
    It matches a 12 point Cassin Crampon (Alpinist Pro) very nice for an aggressive response. Love this combination.
    The zip fastener of the built in gaiter probably contributed to warmth. It was nice feature; so I didn't need to use my external gaiters during the mixed snow/rock/mud conditions, until getting up onto glacier when I put on crampons. I liked.
    I tried and compared to Scarpa Phantom 6000, and chose ArcTeryx after wearing extensively indoors. I liked the slight extra length, but tight side fit of the Acrux.

    Stoked for these!

    • Familiarity: I've used it once or twice and have initial impressions

    Full disclaimer: I'm a huge Arc'teryx fan =) I was looking to upgrade an old pair of mountaineering boots (Scarpa Summit) and saw these and had to try them out.

    Haven't actually used them yet but for me they fit perfect. Thanks to Travis @ backcountry for his help and input on sizing. Since nobody had them locally sizing is always a hard thing to choose. I ended up using the size chart on Arc'teryx site and I was exactly an 8.5, that's what I ended up ordering and they are perfect!

    Yes they are narrow but I have small feet, so I could see people with wide feet having issues as seen in other reviews. Perfect amount of stiffness and seem plenty warm. Now to break them in! It's definitely easier to remove the liner when putting them on and taking them off.

    btw, they fit the new Black Diamond Snaggletooth crampons perfectly.

    not sure who these will fit

    • Familiarity: I returned this product before using it
    • Fit: Runs small

    Love the idea of these boots and the removable liner. But they were too narrow. Someone with a very narrow foot who has trouble finding other boots to fit will probably loves these. I hope they will make them a bit wider.

    Great Boot

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: 11
    • Height: 6'0"
    • Weight: 195lbs

    Considering the weight, these boots are amazing. The liner makes for a great camp bootie and allow for drying at night after a long day. The break in period is a little bit of a longer process that typical. I had to use them for a few trips before the fit felt right. I had some cramping and blistering the first few times out, but after the broke in period, they felt fine. I would say they are true to size length-wise. However, they are a fairly narrow boot, so might not be best for those with wide feet. I've spent several days out in some deep snow, and even some Spring snow that is super wet and have not gotten wet or cold at all. The velcro strap allows for a nice "walk mode" and climb mode. I would say these boots are great for up to 6000 m. One unique tweak to them I'd like to see would be a thinner liner available to use these boots as a single boot too.

    I would certainly recommend these boots. Feel free to reach directly out to me with any questions on these boots, or any mountaineering questions at all. or (801)204-4657

    Great Boot

    Last Second Savior

    • Size Bought: US 11
    • Height: 5'9"
    • Weight: 165lbs

    I unfortunately live in an area where mountaineering boots are not sold, so finding the right boot is tough, to say the least. After signing up for an ice climbing trip in Ouray, I realized some new boots might be in order. After hearing great review about the Batura, I purchased a couple of different sizes online but they just didn't seem to fit, mostly due to heel slippage. So I decided to give the new Acrux boots a shot. They arrived 2 days before my trip and seemed to fit very well so I brought them along.

    These boots were seriously warm for the weight of them, even while standing around in Colorado in December while belaying. They are waterproof on the outside with a zip up system that is bomber. The double boot system is very easy and being able to pull the liner out at night to dry the boots is great. While the lacing system may not be as advanced as the Batura, there is a velcro strap at the top which makes tightening a cinch. The only real issue I had is I felt some slight cramping in my feet which may be because of my low arches, so I took the liner out which fixed the problem, I think i'll look into a flat insole.

    I definitely recommend these due to the weight and quality of the materials. Everyone was very interested in how they performed and the only negative feedback someone gave is that they looked too much like they should be worn with a tuxedo. I'll take it.

    Vito...thanks for the review!

    Sounds like you and I are almost the same dimensions...5'9" and 165lbs. I however wear a 9.5 street shoe. What size do you usually wear - curious how much you sized up. I was thinking .5 size for me. I have a set of LaSportiva G2 SM's that I really want to love, but they've been tighter in the toe and looser in the heal than I'd like. Plus there's something with the liner booties that are rubbing...there's a lot of stitching in there! I've heard such good things about the Acrux that I'm considering selling my LaSpo's for these...just need a better idea on fit. Thanks!! Joshua

    Narrowly Missed Fit

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small
    • Size Bought: US 13/UK 12.5
    • Height: 6'1"
    • Weight: 225lbs

    I've been hiking/climbing/paddling seriously since 1977, and I've owned a "few" pairs of boots during that time. Needing a new pair of mountaineering boots for a winter trip to Colorado, I decided to take a chance on the new Acrux-something I NEVER do, that is buy a newly released product before many others have tried it out. And that holds doubly true for something that is life safety dependent such as a harness, rope, or mountaineering boot.

    I was absolutely elated when I took them out of the box. But my spirits were soon dashed when I tried them on. Too narrow...they fit perfectly otherwise.

    But in the interest of fairness these were/are the best mountaineering-style boots I've ever had on my feet. Pleasantly light but with a ruggedness you sense rather than see. Quality was typical Arc'teryx-superb. Even the color is pleasant after having been optically assaulted by far too many garishly disgusting hues that clothing, equipment, and footwear manufacturers seem to be enamored with.

    Unfortunately I purchased the largest size that Arc'teryx makes (in this product) so I'm out of luck and will have to find another brand. I own 10-12 articles of Arc'teryx clothing and XXL fits me perfectly. But that means layering is a chore unless I take time to mix and match "fit classes" such as expedition fit, next to skin, etc. If the company wants to continue to grow they're going to have to produce clothing for adults. I'm a weightlifter and obviously a bit larger than normal but all the stats I've seen suggests that people are getting bigger and Arc'teryx needs to keep up. For this boot, a US 13 wide would work with a US 14 being as close to perfect as can be achieved with a liner sock and Smartwool's Mountaineering Extra Heavy Crew sock. Come on Arc'teryx...get on the ball! I volunteer to beta test a pair and I won't charge you anything!

    Bret, I totally agree. I am a mountaineer and ice climber in Alaska. I am 6'7" and 255lbs. I am a bigger guy and would love to get these boots....if they came in a realistic size. Once they do, they are next on my purchase queue.

    Unanswered Question


    Dimension of my foot: lenght - 280 cm, wide - 10 cm.

    I want use this boots with Smartwool's Mountaineering Extra Heavy Crew sock.

    Tell me please - what US size to be the best for me in this?

    Best regards, Dmitri.

    Unanswered Question

    Any estimate from arc'teryx on when to expect the next batch of size 13?

    I'm going on a 30 day/ 75 mile/ 13 peak trip next summer in the Wind River Range. Would this be a good boot?

    Hey Sam - These Acrux AR GTX Mountaineering Boots are really designed for cold-weather mountaineering in ice and snow. You could use them in the Wind River Range but I think they might be a bit overkill. Check out the Arc'teryx Bora2 Mid LTR GTX Hiking Boots (Item #ARC00I0) as a solid alternative. I have been to the Wind River Range many times so feel free to contact me directly with any additional questions.

    - Kyle L. - Expert Gearhead

    Can these be punched to gain some width on the forefoot?

    Hi Brian, Where the upper of these shoes is a TPU laminate as opposed to a hard PU shell like a ski boot, these boots really can't be punched out to make extra room. As with any shoe, it should loosen up a bit over time though. Please feel free to reach out to me directly if you have any other questions. - Matthew Pizza - Expert Gearhead