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Arc’teryx designed the Men’s Epsilon AR Jacket for guys who need ultra-breathable gear. The Epsilon excels when you are working your hardest in cool weather. The jacket’s extreme breathability allows your body to regulate its temperature and allows sweat vapor to escape so you don’t get clammy and cold.

  • Laminated zippers reduce bulk for a cleaner fit
  • Moisture-resistant face fabric holds off the unexpected snow or light rain
  • Gusseted underarms allow the jacket to stay in place as you move your arms around
  • Adjustable hem drawcord to keep the wind from climbing up
  • Reviews
  • Q & A

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Great lightweight softshell

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

I'm an alpine skier, fond of layering. Early season or late, I need just enough warm under a very light windshell. The Epsilon AR really fits the bill for me. I'm slender and it fits great, though not tight. It breathes nicely so I don't get overheated and I appreciate the "hood-less" style since I don't need it in these conditions. Perfect for my use

A Quality Light Weight Shell

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

The Epsilon jacket works as an outstanding outer shell as part of my cool weather layering system for daily cycle commuting and works well at 32F with a merino wool base layer and could continue to perform well with a mid insulation layer if the mercury dropped lower. Construction is exceptional and what you would expect from the folks at Arc'teryx. Fit runs true to size. I'm 72" at 192 with a 45-46" chest and the large fit just right. Highly recommend as a shell for active cool weather activities. As always, Backcountry's service is prompt and their shipping immediate.

Not Impressed.

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

I have to say, I am not impressed with this jacket after just simply receiving it and trying it on. First off the jacket is a lot bigger than I would have imagined (I'm 5'10, 140) and I ordered the size medium thinking since it says athletic fit, it would fit exactly how I like my jackets to fit. Sadly, this jacket does not fit me at all. The cut is just odd and baggy, not at all athletic. Secondly, the material just feels thin, and doesn't feel like it would hold up to much of anything, sans maybe a light breeze in spring or fall.

This jacket is a miss for me.Therefore, I am returning it without ever using it outside.


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

The Epsilon AR jacket is a nifty little piece of kit that is always a joy to throw over my shoulders. I'll first say this piece is more of a "nice to have" than a must have if your adventures go beyond day hiking or a walk in the park. This piece just seems better suited for casual day to day wear. Now that doesn't mean with the right combination of layering/conditions it couldn't be useful for someone, but lets be honest...

With that intended use in mind, I was still inclined to pick this up albeit at a discounted price. I have other shells for real excursions, but this really nails it for around town wear. I love the styling and the hard fleece material cuts just enough out of the wind and knocks the edge off the chill. Hardly a warm insulating jacket. It provides enough protection from the elements to get you there, and is comfortable enough to wear inside as well.

What I liked about this piece is it still retains some technical features which allow it to come with you should your day end up at the crag. I'm particularly fond of the drop tail cut of the jacket. The fit is athletic and well fitted.

In typical fashion the workmanship is what you'd expect with Arc'teryx - Flawless. The material seems burly enough that you're not going to destroy your around town jacket should you sneak in a few pitches on your way home from school/work.

Great product, but remember it's purpose before expecting it to be something it was never intended.

Not sure what this jacket is good for...

    After receiving this jacket in the mail, I was unimpressed with the material on the inside. The outside fabric seems durable enough, but the inside doesn't seem useful for anything. It is not fleecy feeling at all, in fact it just feels like scratchy nylon. There doesn't seem to be any insulative properties to it at all, beyond blocking some of the wind I guess.

    This jacket is a shell. It is meant to be the outer piece of a layering system. On a cold day you would be wearing a long john type base layer, a puffy jacket or fleece mid layer for insulation, and this jacket on the outside to provide some protection from wind and also water resistance. Hope this helps.

    Love to wear it

      I can see why reviewers would describe this as "gutless" or "nothing to it" and as their "fav." While I'm not sure what technical niche it fits, it feels and looks great. The fabric drapes really well and moves with your body, and it simply looks good. So while I only wear it around town, I'm happy every time I put it on. It'll keep the weather at bay but I wouldn't expect "too much" of it. It's just a comfortable, good-looking, functional jacket.

      New Fav!

        What a jacket. Lightweight, very water resistant, very wind resistant (20-30 mph), great fit, asolutely dig the orange color, no cons whatsoever. After roughly twenty-four combined hours of hiking in dry conditions, light rains and moderate snows, the water still beads, and the pits smell like the outdoors. Size L fits 6' 2" 205lb frame perfectly with great range of motion. Makes me sad I have so many other great fleece and lightweight jackets, cause now they are going to sit in the closet as backups. I'm sure they will get over it...

        New Fav!

        Good but gutless jacket

          This jacket is one of the least used that I own. There is really nothing special about this jacket except that it looks great and can hold off some light moisture. My Epsilon AR doesn't get used very much because I have other jackets that do a better job of keeping out wind/moisture that are even lighter than this jacket. But If I want to look good at casual events, I usually bring this jacket along.

          The two mesh pockets on the inside are huge! I could probably fit 2 footlong meatball sandwiches in these pockets (they would be nicely squished though). I usually keep my keys or my cellphone (small Nokia) in the arm pocket. If you are looking for a very simple, nice looking, nice fabric jacket than this might be the jacket you should get.

          Thanks Jeffrey, I was actually looking for a "double meatball" jacket, but noone knew what I meant. :) I actually own this jacket as well and I wear it as a midlayer snowboarding. It's great, and the mesh pockets do allow for gloves on one side and mask and/or goggles on the other with ease.

          Really not sure what you guys are using the jacket for, or what you expected, but I find this to be a great jacket for ski touring and cold weather hiking. It is not a hard shell and is not intended to be. Any expectation that it is waterproof or highly water resistant is misguided. On snowy or rainy days, you need a hard shell. If you are looking for something that breathes really well and keeps out the wind and is moderately water resistant (in other words, a jacket for for cold weather hiking, ski touring, snowshoeing, etc. where you will be working up a sweat going uphill and likely encounter wind and maybe some light precip), the perfect jacket. As an America's Cup jacket, or a heavy, wet blizzard jacket or a day to day resort ski jacket, not so good, but it was not designed for any of these things.

          Great jacket, not really what I wanted

            I ordered this jacket for my husband as a layer under his Theta-AR-something shell, and when it came, it was basically another "jacket", not something warm for underneath a shell, even though the description said microfleece and "layering". It was really nice, cool color, and cut - but like many Arcteryx jackets, there was nothing to it, in the Northeast, I would freeze in it! So I sent it back for more of a fleece.

            Perfect for spring/fall

              Prior to buying this jacket I searched multiple sites looking for reviews but could only find reviews of the last model...thus I'll review this one.This jacket is ideal for weather between 50 and 65 degrees, maybe cooler if you're layering underneath. It's very breathable and wind resistant but by no means windproof. It repels water really well but with prolonged exposure h2o will bleed through. I ran in a light rain in 50'ish degree weather this spring with the jacket on and it kept me dry and appropriately cool, i.e. a great job.The fit is perfect. I"v read reviews on the previous version that it is short and snug fitting. This is not a snug jacket but is streamlined and is a good athletic fit. I'm 6'3 195, athletic build and was worried this wouldn't be long enough. The length though is just right, hitting just below the waist in the front. The back hits a bit lower. The sleeves are plenty long and the elastic around the wrists is soft and not too tight so I can easily get in and out. The arm pocket, although cool stylistically, is useful for chapstick, maybe a protein bar, but really nothing larger than that. The reflective archaeopteryx is sweet but would have preferred an embroidered one. The chest pockets are roomy but sit a little too high for comfortably having your hands in your pockets. A slanted pocket may have been better.Finally, the reason for the 4 stars rather than 5 (if I could, I'd give 4.5 stars), is the interior lining. It's a bit scratchy and by a bit I really mean a bit, like a 1 on a scale of 1-10. My wife has the Epsilon SV, which has a microfleece lining (a slightly cooler weather jacket) that is super soft and makes me wish they had a similar lining for the AR jacket. I'm being picky but hopefully helpful.Overall, I like this jacket a ton. I have a North Face Apex Bionic, which has the soft inner lining and is a warmer jacket, as well as windproof, and I like the Arc'teryx better simply b/c the material is way more flexible.

              Does anybody have the measurments of the...

              Does anybody have the measurments of the front and back in size L and XL??

              Hi, I am 5'8" 140lbs. Not sure if I should...

              Hi, I am 5'8" 140lbs. Not sure if I should get a Small or Medium?

              The Epsilon is designed as a trim fit jacket that works great as a layer under hard shells, as well as a stand alone with lots of breathability and moderate weather protection. If you'll use it like this, a small would fit best. For more outerwear use, with room for a thicker layer under, a medium could work.

              I'm 5'10" and a little under 140 and most Arc Smalls are either a little roomy or too darn big for me. I have a scrawny runner's body, i.e., no chest, so maybe that's the difference. I've tried the Epsilon on and found that a Small seems pretty good. Even the sleeves are only a little long on me, another problem I have in getting the right fit.

              Hi, I'm not sure on sizing. I'm 6"2 and...

              Hi, I'm not sure on sizing. I'm 6"2 and 205lbs. Anyone have any advice please?