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Your own impervious micro-climate.

Arc'teryx decked out the Men's Theta AR Jacket for true multi-sport versatility. Ideal for mountaineering and alpine climbing, this jacket also provides your own comfortable micro-climate on backcountry ski tours. The Theta AR offers many of the same features as its brother, the Beta AR, but is cut longer (hitting at the thigh) to offer extra protection when it's really coming down. It features Gore-Tex Pro Shell three-layer construction, with the proprietary, tightly-woven N40p-X shell fabric that includes a DWR treatment to slough off rainfall while you romp up 14ers or get caught in a snowstorm at the top. The Theta AR is reinforced in hard-wear areas like the shoulders and arms with N80p-X nylon so it will handle pack straps and ice encounters season after season.

Fully taped low-bulk seams and WaterTight zippers will block out any moisture you encounter. When it starts puking, take shelter under the helmet-compatible DropHood with its draft-blocking separate collar, and stuff your hands in the two hand pockets, which are placed high so they play well with hip-belts and harnesses. Underarm zip vents let you cool off without sacrificing any protection from the weather.

  • Gore-Tex Pro Shell membrane (3-layer)
  • N80p-X and N40p-X shell fabric
  • Fully taped seams with low-bulk microseam allowances
  • WaterTight zippers
  • Laminated underarm zip vents
  • Helmet-compatible DropHood with separate high collar and laminated visor
  • Die-cut hook-and-loop cuff tabs
  • 2 high hand pockets and 1 internal laminated pocket
  • Generous fit with no-lift gusseted underarms and articulated elbows
  • Longer cut with full seat coverage

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Arc'teryx Theta AR Jacket - Men's

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Here's what others have to say...

5 5

The blue is amazing

  • Familiarity: I've put it through the wringer
  • Fit: Runs large
  • Height: 6' 9"
    Weight: 126 lbs
    Size Purchased: small

The color is not like the picture in the web.But the ture color is amazing.It feels a little large but still look well.

5 5

Runs Large

  • Familiarity: I've put it through the wringer
  • Fit: Runs large
  • Height: 6' 0"
    Weight: 160 lbs
    Size Purchased: Small

I got this jacket this spring. It replaced an old Patagonia Torrentshell and it quite the step up. I wear it fishing, running, biking, hiking and as a general rain jacket. I haven't had any issues with leaking at any of the seams. The pit zips are large enough to dump a lot of heat and prevent the inside from getting too clammy. I decided to go with the Theta over the Beta because of the length, since it is longer I get more coverage on my lower back when bent over my handlebars.

I am 6'0 165 lbs and went with the Small. The Theta AR in small is longer than the Beta AR in medium while fitting my narrow shoulders and skinny arms better than the Beta as well. Pictured below in Nighthawk.

I have the sidewinder SV for over 3 years now and it still looks pretty new because the whole jacket is made with n80p-x. The theta is a mix of that and n40p-x. How rugged is this jacket abrasion wise?

The n40p-x is still a very durable face fabric. The Theta AR is designed as a solid hardshell, good for year-round use. It's great for hiking/trekking in the spring/summer/fall and also works well as a ski/snowboard jacket (altho it doesn't have a powder skirt.) Having said that, it really depends on what your objective is. If you're going to be using this in an extremely abrasive alpine environment you might consider the Alpha SV, which uses n80p-x only.

I had the alpha sv for a few years also. I know that it was very durable but never got use to the pockets cause im not a climber. So I sold it and got the sidewinder. I always like the look of the theta. I generally just use my Arcteryx gear for snowboarding and the NYC weather. Thanks for your input.

5 5

Great All Purpose Shell

  • Gender: Male
  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Height: 5' 11"
    Weight: 230 lbs
    Size Purchased: XL

I bought this to replace my tired Alpha SV from Arc'teryx. The primary goal was snowboarding. I like the shell/insulation layer approach as I run hot and it's nice to be able to shed a layer. I didn't like the storm hood style collar that becomes the hood all in one piece. I felt that the hood pulled the shell from the back of my neck when it wasn't on my head. The Theta and Beta have a drop-hood design which gives you a designated collar and hood that work separately. Love it. The extra length is great too. It's just a longer Beta AR more or less. The fabric is bomber and impervious to nature and spilled beer.

It may be a bit long to wear around town. Your call on that one. I got the two tone green and it looks Boss.

Great All Purpose Shell
5 5

Stellar Shell from Arc'teryx

  • Familiarity: I've used it several times
  • Fit: Runs large
  • Height: 6' 2"
    Weight: 200 lbs
    Size Purchased: Large

Have used the jacket a handful of times now. I live in the pacific NW and it rains a lot here, yet this jacket keeps me cool and dry. Took it on a 4 mile hike and despite being a little noisy the jacket stood up great to the elements. I got it 20% off too thanks to the excellent sale going on at! The glued seems do worry me a little bit but it ensures no puncturing in the gortex fabric. The jacket looks sharp as well and has ample storage, yet it folds up nicely into a small space in my pack! I am 6'2 200lbs with a pretty long torso and very broad shoulders / chest and the Large size fits me just right. I originally ordered an XL as that size fits me best in most situations but it was a little too long in the waist and the arms. I hope to get a lot of use out of this shell for years to come!

hi, i am also 6�2 and 200 pounds, i was wondering if theres enough room for another jacket or maybe a couple of sweaters underneath the tetha, i intend to wear it in the winter in northern germany. thank you

Yeah the large would have enough room for a smaller thermal or polar fleece, would probably be a little tight if you wanted to do more than one extra insulation layer. I do a compression long sleeve shirt and a light weight down vest and that keeps me pretty toasty but I still have full range of motion in the jacket. The theta AR is definitely one of the larger jackets size wise.

5 5

Great shell for many uses

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Height: 6' 0"
    Weight: 185 lbs
    Size Purchased: Medium

I purchased this jacket at the end of ski season and have used it skiing, biking, hiking, kayaking, wearing in to work, coaching and watching sporting events. It has worked extremely well for all of the above as I pair it with an Atom AR when it is colder than 40 and the wind is blowing ( I run cold). It is water tight. I actually got in the shower, put the hood up, cinched it and turned on the water to really test it (wife thinks I am crazy). Only thing wet was my face and lower extremities. It is truly waterproof. With the pit zips open, I was not hot on a 70 degree San Francisco windy day followed by a San Fran 50 degree rainy day biking the golden gate. A cold north wind is no match for this jacket and the longer bottom to cover mine was nice, especially when biking. I consider this a very expensive jacket and my first Arc product, but I also plan on using it for 20 years. It replaced my 22 year old North Face Goretex parka that got holes in the sleeves. I would not say this jacket is warm but it is a shell so I was not expecting parka warmth. That is why I paired it with something else (Atom AR) to keep me toasty warm. I was concerned with sizing and the small was too tight in chest and the large was too long in the arms for me (6-1, 185 lbs). The medium fits well and is not too tight, even with a base layer and my Atom AR (thicker than the LT). The pockets work out fine and another pocket on the inside would have been nice also, but that is talking about the color of sprinkles on a great frosted cake. It is also very lightweight but it does not feel cheap or thin like a running rain layer It looks good, performs well in medium temps, sheds water like a duck and paired with midlayer, keeps you toasty warm. Very expensive, but it does everything that is advertised, which I why I bought it.

5 5

This is the one.

  • Gender: Male
  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Height: 5' 10"
    Weight: 170 lbs
    Size Purchased: Large

There are so many different variations of the Arc'teryx jackets to chose from, but the Theta AR's construction and features make it a very well rounded and versatile jacket ready for any activity. The 3-layer Gore-Tex and taped seams truly keep out the wet. The considerate length of the pit zips allows you to pull your entire arm out of the sleeve and turn the jacket into a waterproof vest by tying the sleeves together behind your head. This is a must when hiking in warm yet inclement weather. Also, one of the best features about the Theta AR compared to it's counterparts is the length. Many of Arc'teryx's other jackets are cut at the waist, which may be great for climbing, doesn't exactly lend itself to looking good when rocking it out around town. Although function before fashion in technical gear, you shouldn't have to be seen in public wearing a belly-shirt cut jacket. This jacket comes down to about the hips, looks great for more casual occasions in crum weather, is great for minimalist traveling, and most importantly, this jacket really stands up to those torrents. It has an incredible amount of features, but none that are simply just bells and whistles. Balanced between weight and durability. Sizing was just perfect for laying with a merino and insulation.

This is the one.
3 5


  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Height: 6' 4"
    Weight: 180 lbs
    Size Purchased: L

I bought the Theta AR because it is long, I'm long, and it wasn't over-the-top expensive (compared to other Arc'teryx). I haven't had a chance to use it yet, but I work in the Arctic over summers on wet, rocky cliffs and have to layer quite a bit. My work includes long periods of activity mixed with extended periods of inactivity. My initial impression is that the jacket fits too tight under the armpits and that the jacket may be too restrictive after fitting a bulky layer (like my icelandic sweater or down jacket) underneath. A size XL fixed the problem, but then I was swimming in fabric around my torso, so I sent it back. This is my first Arc'teryx, and the rest of my team likes the brand, but I'm still looking for the perfect jacket. I'm taking this one with me this summer, and we'll see how it goes.

(I gave it three stars because I am basing the rating on my initial impression of the awkward fit for my size and shape (tall & lanky). I haven't used it. The rest of the jacket seems great.)

5 5

Bullet Proof.

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

I'm on my second in 10 years and I only bought one. I loved my first, sent it back to have the pocket sewed back in and they sent me a brand new one. Epic. This jacket is bullet proof, zippers never snag, water and bullets get stopped in their track. Short cut is perfect for us short guys and man does it look good. Seems like Patagucci just copied the color scheme as I got one of their nano puffs to rock under this bad boy, same blue and orange. Matches like a dream. Don't $leep on it, totally worth it over time.

I'm 5'7, 155Lbs, Small fits like I have my own italian tailor.

5 5

Great Shell

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

I have had this shell for over three years and it still performs and looks great. Bought it for both backcountry and in-bounds skiing, but also wear it around town, and to work (at a college) when it is blustery. Well worth the extra to go with arc'teryx. It fits well under a day pack (I ski with one in bounds as well) and rolls up tight for storing for skinning up. the sleeve pocket is just right for a regular cell phone, but not the larger ones out there now. The pit zips are very functional. all in all, it is very functional, keeps the weather out, and able to layer underneath. It is a trim fit, so the bulky downs may make it snug. Otherwise layering is efficient. I'm 5'8", 160 lbs, and the medium fits great.

Great Shell
4 5

Comparing the Theta and Alpha

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

I recently ordered three Arc’teryk shells trying to get exactly what I wanted (with plans to return two of them): Alpha SV, Alpha LT, and Theta AR. I tried them on with my climbing helmet, alpine harness, and a down hoody liner:
-Alpha has a great overhead reach and the hood fit my helmet quite well, though the hood hung limply when not over my head. The SV has a waste cinch six inches from the bottom and a bicep pocket, which the LT doesn’t have. The main difference is: LT used 2 layer 40D GoreTex, SV used 3 layer 80D. The result is that the SV feels a lot more durable. It’s probably worth the extra 100 dollars if you’re planning to rough it, and it’s only another ½ pound of weight. One big downside: the only exterior pockets are a pair on your chest near the zipper, which you have to reach over to use (i.e. you use your right hand to reach into the pocket on your left side). This leaves nowhere to put your hands.
-Theta: the Theta looks strangely long, though that does add some waterproofing below the waist. The “AR” designation means it uses 40D GoreTex in most of the jacket, but 80D GoreTex in the forearms, shoulders, upper back, and lower back. I find this to be an optimal tradeoff in terms of weight, durability, and cost. The jacket also has a different neck/hood layout that looks more natural when wore down and still adjusted okay on the helmet. The pockets are set wide on the chest making them a comfortable place to put your hands. Conclusion: Theta AR wins because it uses the right mix of materials and has the right pockets/hood for wearing on the mountain and around town. If you don’t love the length, get the Alpha AR.
-Regarding fit. I ordered the Alpha SV in small, the other two in medium (just to get a feel for the difference). I’m 5-11 and very skinny. The small was okay but slightly restricted my overhead movements and was a bit tight with layers. The mediums are puffy on me, but, then, I need to eat more.

4 5

Another great offerering from the BIRD

  • Familiarity: I've put it through the wringer
  • Fit: Runs large

A perfect combination of lightness and durability in a longer cut jacket. im 5'10" and 165lbs. I ordered a medium at first and I was swimming in it. Got the small and found a perfect fit. Just the right length in the front a rear to cover nasty gusts of wind, and nice long sleeves for those of us with ape arms. 2 hand pockets work well with a pack and without. Sleeve pocket is hit or miss depending on what you plan to put in there. Inner pocket is Huge and fits my passport and phone with room to spare (could put a flask in there if needed).
shoulders wrists and hem are reinforced with a tougher fabric, lighter weight 40D nylon in the main body keeps the weight down. Could start using 8mm gore seam in some areas to take down the weight, bulk and add a bit more breatheability. Drophood could be placed higher on the collar like previous proshell models (before F13 redesign). Im just nit pickin' a little.....
Overall great shell. Cant go wrong with a great pice like this

5 5

What's not to like?

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

This shell is tough, breathable, fits great, and has excellent attention to detail. I'm a big fan. Got caught wearing it on a hot day when we were expecting thunderstorms, and I was not nearly as hot as I anticipated. Great all-around shell.

Oh, and I also love the hip length on the Theta's.

4 5

Luck'd into this one

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

Ive had the shell for 3 years now. I use it for a rainjacket, windproofing on inter-island jet ski treks off Norther Baja(100% salt water exposure), and many days on the mountain snowboarding which is primarily what i use it for. I run a little hot and wear with long underwear and a flannel to ride with. If its super cold i'll wear a Patagonia down vest over the flannel. Still looks new. Just now losing waterproofing(snowing @ 33-36 degrees, extremely wet) and treated with the wash-in stuff. I like the longer back compared to other models, the fit is good(im 5'8" 160 and wear a small), shoulder pocket great for ski pass, super light and basically worth the $. I was hesitant to throw $ like that down for something so simple. No bells, whistles, or insulation. If the waterproofing products (spray or wash in) work ill happily give 5 stars. But for now...

5 5

Initial impressions

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

6'0", 180 lbs, 40R
Medium fits perfectly.
200 weight merino, Patagonia R1, and down sweater vest, toasty on cold windy days on the lift. If it was bitterly cold the arms would accomodate a long sleeve down sweater. I like the length in back. Design is minimalist, but not missing anything. Perfect shell.

what are the differences between the Theta...

what are the differences between the Theta AR and Theta SVX? besides $180 in price.

Best Answer

The differences between the two jackets, when compared from the listed specs on Arc'teryx's website
are as follows:
-The Theta SVX is listed as being "highly durable," whereas the TAR is listed as being "durable."
-The TAR is listed as having "gender specific patterning," whereas the TSVX does not boast that feature.
-While both jackets have a laminated brim on the hood, the TSVX is listed as having the "StormBrim,"
which is purportedly "longer in length for extra protection from the elements."
-On the construction, I'm a bit confused, due to the fact that they are both made of GTX Pro 3L material,
but the TSVX is the only jacket that has specified features stating that it is comprised of "GORE-TEX
three-layer construction." I find that interesting, because the TSVX is shown to be made solely of
N80p-X GORE-TEX Pro 3L, whereas the the TAR is shown to be made of both N80p-X GORE-TEX Pro 3L &
N40p-X GORE-TEX Pro 3L materials, so I'm unclear as to what the discrepany in listing specs is on the
Arc'teryx website.
-While both jackets have chest pockets with laminated zippers, the TSVX has both an EXTERNAL chest pocket AND
an INTERNAL chest pocket in addition to an internal mesh pocket; on the other hand, the TAR has an
INTERNAL chest pocket, and that seems to be about it.

Cont. from above, sorry about the length....
-The TAR is shown to have "full seat coverage," so you can pop a squat when the ground is nice and soggy,
keeping you totally dry while you grub a delicious trail bar; moreover, it is shown to have "reinforced
shoulders, arms and hips," whereas the TSVX is listed as having neither of those details.
-The TAR is catalogued as having a "Helmet compatible DropHood," where on the other hand, the TSVX has
advertised as having a "Helmet compatible StormHood." I do not actually know what the difference is between
those two hoods, if there is any extant difference at all... perhaps that harks back to the foregone "StormBrim,"
just a thought.
-The TAR is presented as boasting "one-hand adjustable drawcords," but it doesn't seem as though the TSVX
mentions that feature.
-Although this seems to be a somewhat trivial addition to the spec lineup, the TSVX is shown to have a
"laminated high-strength hanger loop," though I guess that would be a potentially large pro if you are used
to having jacket loops snap while they're hanging up.
-Finally, both the TSVX and the TAR vaunt WaterTight Vislon front zippers, it is apparent from the listed
specs that only the TSVX has a "double back flap to ensure weather protection." Now, if that is the
equivalent of the TAR's "full seat coverage," I cannot say; it is definitely something worth thinking about or inquiring

5 5

Tried every Arcteryx Shell

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

Out of all the arcteryx shells I really like the drop hood on this one. The fit is athletic and there are hints of the alpha sv within this theta. The cuffs and the n80px material are all from the alpha sv. This jacket has pockets which is huge and I really like the N40rx vs the new n40px fabric. I took this jacket skiing and it was bombproof with just a montane alpha guide hoody under. It fits a little longer in the back then I would like but its not a big deal at all. Great jacket and great quality.

5 5

Tall fit with frills

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

I've just recieved this jacket and have worn it for the last few days. Initial impressions are that the fit is nice and long just as the Theta fit is said to be. I'm 6'3" and have the large. It sits nicely below my bum just as I like it. I'm 180lbs and the chest fit is functional with room to layer underneath.
The hood is extreamly large. I know it's meant to fit a helmet but i've had smaller hoods handle a helmet just fine. I have to pull all the draw chords nice and tight to have it fit/sit nicely. The brim of the hood is not very sturdy but maybe it will break in and hold a nice position with time.
There are a whole wack of extra draw chords on this jacket allowing you to fine tune the fit nicely. A standard jacket would have 2 in the hood and 1 around the bottom. This jacket has 3 in the hood (extra one from the back of the neck to the back of the head) and 2 around the bottom (extra one around the hips, where a backpack waste strap would sit). The overly sized hood can be controled by the 3 draw chords so I would not call it a set back. It is very easy to put the hood up when zipped up all the way because of the 'drop hood' design.
I'll upload some photos of the jacket soon!
Any questions i'd be happy to answer

Hey William, can you measure from the neck to the bottom of the jacket in the front and back? In inches? I'm really struggling to find the right size. I'm 6.1 and 190, and heard the Theta fits a size larger than the Beta. It would be SO helpful.