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Built for dynamic alpine activities.

First and foremost, Arc'teryx shaped the Men's Gamma MX Softshell Jacket for mobility and outfitted it with highly breathable shell fabric for comfortable temperature regulation. Alpine climbers and backcountry skiers can wear this midweight jacket alone in mild, mixed weather conditions, or they can wear this jacket as an insulating layer beneath a storm shell.

  • Lightweight shell fabric breathes easily
  • DWR coating causes light precipitation to bead and roll off the surface of the fabric
  • Fleecy interior face of the shell fabric provides a touch of warmth
  • Articulated cut and gusseted underarms allow for full range of motion and freedom of movement
  • Hip-length jacket has slight drop tail for added protection

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Here's what others have to say...

Where is that made?

I own six Arc'Teryx jackets and four were made in China, other two in Bangladesh. Pretty sure the Gamma MX is made in China - my Gamma LT was made there.

What is the center back length of a medium?


Arcterex phoned this jacket in...

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

I recently traveled to the Canadian Rockies and forgot my technical shell. I didn't want to buy another; the forecast for the Columbia Icefields called for steady rain. So, I bought this jacket because my softshell was old. My only experience with soft shells was with Mountain Hardwear, with fully taped seams, windproof and almost fully waterproof. I expected this jacket to be a true technical softshell based on brand and price. Boy! Was I stupid! This is an overpriced fleece jacket at best. Perfect for early fall walking down the suburban streets of some ultra rich town to show off. I have had warmer, windproof and more water resistant jackets for half the price. Learn from my mistake. Do your research and compare features. Arcterex should be ashamed of the engineering and construction of this jacket at a $300 price tag.

This is mjm signing back in to clarify. I was not looking for a hardshell. I wanted a TECHNICAL SOFTSHELL which I think should have the following characteristics: windproof, water resistant (with taped seams in critical areas), and fleece warmth for a windy, 40 degree day. Please tell me if my definition is incorrect. As for the Gamma MX, it does not meet the above criteria.

A hardshell is meant to be wind and waterproof. I have never expected a hardshell to be warm by itself. You always must layer properly under a hardshell.

Please give prospective buyers the data they need to make an informed decision about a purchase. $300 is a lot of money. I welcome additions to this discussion.

I have read countless reviews (here on BC, Arc's site & other online retailers) on the Gamma MX, as I've been looking at buying one myself for awhile. The vast majority of them comment on the breathability of the Gamma MX and it's versatility through a wide range of temperatures. Its ability to shed outside precip comes primarily via the DWR treatment, but as most all other stretch-woven softshells it will wet out sooner than not. Arc'Teryx doesn't market it saying anything different and countless online reviews of the jacket back this up. I own the Gamma LT and while it features slightly different Fortius fabric its properties are similar. I do also own the Arc'Teryx Venta AR softshell, which sounds like it would have fit your needs far better: it's a three-layer Windstopper (which does exactly what the name suggests), and having a membrane it has never gotten me wet in the snow. I've never subjected it to prolonged rain so I cannot comment on that, as Windstopper membranes aren't typically billed as being completely waterproof. The jacket has light insulation, and this combined with the jacket being windproof allows retention of quite a bit of warmth. I will wear this jacket in Wisconsin a bit below 30F just walking around town, and have taken it in to the teens when being more active. The differences between the Gamma MX and the Venta AR I describe here are readily available through the Arc'Teryx website and just about any other online retailer which sells & reviews their products. I would agree that $300 is quite a lot of ca$h to spend on a jacket that clearly doesn't do what you were counting on it to do. If someone "sold you" on the Gamma performing more like the Venta AR I describe then I wouldn't blame you for being upset. I post this simply to point out that Arc'Teryx offers a variety of different softshells offering a variety of performance features, including varying degrees of wind/water resistance & temperature tolerance.

Is it possible to get the sleeves tailored shorter? The XL fits perfect on my larger arms but the sleeves need to be about 1.5 inches shorter. Not sure if my local tailor would be able to get the job done.

I would say that it's possible, but the tailor would probably ask that you exonerate them regarding any situation that might result in an undesirable outcome for the jacket, and consequently, you. If I had to guess, I think you would be hard-pressed to find a tailor that would take on that project; I would think that there is a relatively high likelihood that the tailor would have a difficult time restitching the necessary pieces into place, on top of the fact that it would very likely reduce the performance capability of this jacket. I would assume Arc'teryx would use some specialty thread and/or glue to secure their fabrics together, so I personally wouldn't risk taking it to a tailor, but like I said, I'd say anything is possible.

Thank you for the reply. I've seen a few people in forums talk about people who specialize in tailoring gore tex stuff and was hoping maybe even a regular tailor could handle it. Seems like it would be a big hassle though and probably not worth the trouble.

What is the difference between this jacket and the Epsilon LT in terms of fit and function? (Other than the chest pockets)

Best Answer

The Gamma is not as breathable as the Epsilon. Its going to be a warmer jacket but, the Epsilon will breathe better. I would use the Epsilon jacket for more aerobic adventures or if you just run really hot. They both will fit the same.

How cold can this jacket tolerate? Can I...

How cold can this jacket tolerate? Can I trust this jacket with temps that dip into the 5 to 10 degree range (assuming I stay somewhat active)? I know I would have to wear some sort of baselayer, but, is this jacket capable of keeping someone warm in colder temperatures?

Hey Steve,

There's no accounting for personal comfort levels, but without a pretty heavy baselayer, I'd be nervous about this piece in 5-10 degree weather (assuming we're talking Farenheit, anyway.) This jacket is only very lightly insulated-- the new Fortius 2.0 fabric is laminated to a 160 gm weight fleece, but it's definitely still a softshell, so you'd likely need additional warmth from other layers for serious below-freezing temps.

Please give me a shout if you have any other questions! 800.409.4502. ext 4456.

Thanks Lara, I appreciate your input.

Best Answer

Steve... for just walking around town, I'm comfortable in this jacket into the mid-thirties with just a t-shirt underneath (assuming no wind). Lara seems tougher than me.

Haha, thanks David. Good perspective.

Steve, Ive had this for a winter and its not bad for 40's or higher, but it is defiantly not that warm. I have a Lorum jacket now with Polartec and for the same thickness, they Lorum is much much warmer. However, if you are looking for a late summer-early fall jacket, its not bad.

Kyle, thanks for your perspective. I appreciate it. I eventually decided against this jacket, mainly because of the reviews here in response to my question. I'm certainly not doubting this is an amazing jacket, but it isn't the right one for the purpose I need. I was really looking for something warmer that can tolerate really cold temperatures.

whats the difference between this yrs model...

whats the difference between this yrs model and last years?

There is no difference between this current years model and last (except some colour changes). If I recall the last time they changed the jacket was in the Fall 12 version when the revised the cut/style of jacket and changed from polartec powersheild to the current fortius 2.0 fabric.

so im guessing fortius 2.0 is better than the polartec powershield as far as materials go

Fortius is a bit more breathable and is slightly warmer than the old Polartec PS. This is not based on any scientific testing but just regular usage of both versions of the jacket. I did find powersheild to cut the wind a bit better. lastly I find the fortius fabric seems to resist fading and the discolouration at he cuffs and hems.

Do these run slimmer than Epsilon series?...

Do these run slimmer than Epsilon series? I normally wear a small but I found a clearanced small in nightshade and it was tight. Thanks

The epsilon series is wider in the Chest (since the fabric has less stretch). Shoulder witdth is about the same. The new epsilon LT however is much slimmer than the old AR/SV series .


I wish to be buried in this garment.

  • Gender:Male
  • Familiarity:I've put it through the wringer
  • Fit:True to size

That is all. My legal counsel has already been informed.

Also, prAna stretch zion pants. Get em now before Columbia changes them.


Handsome Blackbird

  • Familiarity:I've used it several times
  • Fit:True to size

Fell in love with the unique design of the jacket. The two chest pockets and logo really set it apart from the crowd. I got the Blackbird in a large. Its sporty and handsome. I'm 5/10 160 athletic build and the fit for me is near perfect. I use it for hiking , walking and for going around town. These things aren't cheap, but hey Arc'teryx is Arc'teryx.


very good jacket

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

Very good quality and well made. Only problem is it's a very slim fit. I am usually medium size in all other brand ( TNF, Mountain Hardwear, Patagonia ... ) but Arcteryx is so tight that can't wear anything under it. And sleeves are little too long so I can't wear large. If you are slim and long type than go for it.


My Favorite Jacket

  • Familiarity:I've put it through the wringer
  • Fit:True to size

This jacket is incredibly comfortable and holds up well against the wind and rain. This is my 'go-to' jacket in my closet. I'm 6"5 220lbs and went with a Large. Great fit. Plenty of sleeve length and fits well through the body.

Hello Stephen. did you layer much? I'm 6'2", 227 (and dropping) and usually wear an XXL, certainly would in an ArcTeryx. Was a large very trim/snug for you? Thx

Jim, Just saw your comment!... No, I typically don't layer much with this jacket; if I did, I would have adequate room for a base layer and a sweater. The jacket has what I would say an "athletic" fit, but the material and overall fit allow for excellent range of motion. Hope this helps!


One of the best jackets I've worn.

  • Familiarity:I've put it through the wringer
  • Fit:True to size

This jacket is phenomenal. I bought it little over a year ago when on sale. Since then I've used it for just about any activity from skiing to climbing. One thing I love is how durable it is. I was in a cave a little over a foot white and was sliding through it wearing this jacket. I thought it would surely show signs of the scraping in the cave but nope, it withstood all the abrasion with no problem. Another thing I love is just how versatile it is, it can be worn as a stand alone piece in moderately cool weather, it can be a layering piece, and it also has enough room for more layers underneath. When spring skiing i wear this and another layer underneath and am completely warm. It is advertised as water resistant which it is, but it really takes alot for it to give, and it is also fully windproof.

Pros: Versatile, Comfortable, Great weatherproofing, light/packable, stylish, decently warm.

Cons: Requires more layering for colder weather, price

Overall this jacket is great, it is a great piece for just about anyone wanting a daily use jacket that can still hand up to just about anything thrown at it. Must buy!

FYI I've read elsewhere that the MX is not windproof and Arc' doesn't claim it to be; I own a similar piece and it does provide a good deal of wind resistance for sure.


Not as good as previous incarnations

    I bought this to replace my 2nd Gamma MX since I got a screaming deal. I am sold on the concept of this jacket and use it as a light shoulder season jacket on it's own and a layering or high exertion piece in the winter. I rarely use sweaters, fleeces anymore since buying the MX. Between a short sleeve or long sleeve base layer, the MX, and a shell in various combinations I'm set for 85%+ of the conditions in CO. I swap out the MX for an insulating layer only when it really gets really cold.

    That said - I don't like the new Fortius material nearly as much as the old. The face isn't as slippery (read harder to use for layering) and it feels warmer, but not in a good way. Where it used to be a perfect for 35-60F depending on level of activity, it now feels too warm at the higher half even as a casual piece.

    I also don't like that they relaxed the fit of the XL. Now too roomy in the arms and gut even for a big guy. It is much less athletic. I'm a big fan of Arc for not assuming that all XL guys are fat arses like NF does, but they headed in that direction in this version of the Gamma MX.

    Long and short is that I sent this back and will ride out my current MX until it is really threadbare.

    great review from a perspective of an older model owner. i was planning on upgrading from my 3 year old Gamma MX, and per your review, I've decided to wait to see if they'll revert their design and fabric back to those of the older models. Chances are they won't which is sad. What I love about my older model is that it's trim fitting, but has plenty of length in the arms, and as you said, it's very versatile in a wide range of temperatures. Sad to hear indeed.

    Based on your great review I want to buy one!

    Speaking as a fat arse XL, just the jacket I need. It will accomidate my man-sized proportions, instead of catering to the stick figure set. ;)

    Neo, if that's the case you'd love most of Patagonia's sloppy sizing these days too...

    I like the feel of the Schoeller fabric as opposed to the Fortius 2.0. The Schoeller was sleek, super stretchy, and reasonably good at blocking the wind.

    Gamma makes me even handsomer.

    Gamma makes me even handsomer.

    There are a few layers under here. SO comfortable, flexible, warm and breathable.

    say, what color is that? I mean, i know it's blue, but i'm trying to figure out what the color Poseidon looks like. Sounds easy enough, if there was some consistency among cameras, camera settings, display type and settings, lighting type and color rendering indices, etc., etc...

    Pocket linings

    Pocket linings

    All four pockets are lined with mesh. What that means is that they serve as ridiculously effective vents if you open them. (It also means they aren't really "cozy" as hand warmers, and that if you want your pocket open for some reason you need to suffer a breeze.

    Zipper Detail

    Zipper Detail

    A thin, pliable, strip of rubbery stuff seals off the zipper.


    Among my very favorites

    • Familiarity:I've used it several times
    • Fit:True to size

    This jacket is one of my favorite things. Functions well in the wild, looks sharp around town.

    It has a huge temperature tolerance and I wear it from the low sixties into the mid-thirties.

    All four pockets also serve as vents for the jacket and are lined with mesh. Wind resistance is pretty good, but the jacket breathes so incredibly well it's amazing.

    Has been holding up well to near constant use in the three colder seasons.

    I'm 5' 9" and 185 lbs. Do you think a...

    I'm 5' 9" and 185 lbs. Do you think a medium or large would fit better? Thanks!

    The large will fit and leave you a little room to layer underneath. I'm 5'10" 200# and the large fits like it's tailored for me.

    6'1" 175lbs., 42 shoulders, 32 waist.......

    6'1" 175lbs., 42 shoulders, 32 waist.... thinking large, any insight?


    Depends on what you want it for. I'm 6'1" 175 lbs, 40 shoulders and a 32 in waist. I fit in most all Arc'teryk gear in a medium with a good athletic fit that doesn't look stupid by its self, but has enough room underneath for some layering if need be (base layer and thick fleece). You would fit in the Large fine, but it will probably have a bit more room and not be as much of an athletic fit. Comes down to how many layers you want to throw on under it basically.

    Arc' Jackets are a bit tough to fit for guys in the 6ft/170 lbs/40-41 inch chest/32-33 inch waist size unless you have really long arms. I wear a 16/33 inch sleeve length in a dress shirt. The large fit great everywhere except the sleeves. They simply swallowed me. So opted for the medium. A little tighter fit in the chest but not unreasonable. The plain fact when you're sized like we are, you're going to have to compromise in almost any article of clothing you buy. This size sits squarely in the middle of M and L!