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  • Arc'teryx - Thorium AR Hooded Down Jacket - Men's - Black

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  • Arc'teryx - Thorium AR Hooded Down Jacket - Men's - Black

Arc'teryx Thorium AR Hooded Down Jacket - Men's

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    23 Reviews


    Weather the cold and somewhat wet storms with this hybrid.

    The element, thorium, was named after Thor, the Norse god of thunder. It stands to reason that Arc'teryx attached the same moniker to the Men's Thorium AR Hooded Down Jacket. This down jacket will protect man from the evils of winter and the perils of packing when space is at a premium. The combination of 750-fill European grey goose down and specifically situated synthetic insulation offers aggressive warmth when this jacket is worn over a thermal baselayer if you're working hard, and when it's worn under a hardshell if Thor is flexing his muscles and throwing storms in your face with gleeful abandon.
    Down is a fowl mix of feathers and clusters that work cooperatively to create air pockets in and amongst the fiber structure. Air pockets are little barricades, preventing warm air from escaping and cold air from entering. Synthetic insulation works the same way, except instead of using feathers, it uses man-made materials to create the air-pocket barricade. The big difference between natural and synthetic insulation becomes evident when moisture is an issue. Wet down is dead down, and you'll go down quickly from the cold. Synthetic insulation resists water penetration and dries quickly when water wins out, reducing your exposure to cold, wet conditions. The designers at Arc'teryx exploited the differences in insulation to your benefit; areas that are the first line of exposure to the elements, like your shoulders, the hood, and the collar, are filled with Coreloft instead of down.
    The athletic fit and low-profile cuffs cut a trim silhouette, and if it's 60F when you're putting together gear for a cold-weather adventure, the Thorium squishes down into a cylinder not much bigger than a large coffee for easy packing. Throw it in your bag and still have room left over for essentials, like chocolate bars and beef jerky.

    • Colibri 40D mini-ripstop nylon, DWR finish
    • 750-fill European grey goose down, 100g (M)
    • Coreloft insulation, 80 and 140 g/m2
    • Athletic fit, hip length
    • StormHood, Coreloft insulation
    • 2 zippered hand pockets
    • Stuff sack included
    • Item #ARC3660

    Tech Specs

    [shell] Colibri (nylon), DWR treatment
    [Down Composite Mapping] 750-fill European goose down, Coreloft 140, Coreloft 80
    Fill Weight
    (down) 3.5 oz
    Center Back Length
    28 in
    2 zipperd hand
    Claimed Weight
    [medium] 14.5 oz
    Recommended Use
    hiking & camping, skiing & snowboarding
    Manufacturer Warranty
    limited lifetime

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Very close to perfect

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

    Great length, True to Arc'teryx size for me (XL for 46L jacket, 38" waist), perfectly warm in breezy windy teens over LS 150 merino baselayer and not too hot when it's up to 40. Perfect under a shell when it's colder or wet. Great length. Only niggle is no adjustment on hood. It fits well, but an adjustment to snug the hood around the crown of the head would make it perfect. Packs nice and small, about Nalgene size, and very low weight.

    If it ain't broke, don't fix it!

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

    Please don't ever change this jacket Arc'teryx! Absolutely love it. It is great for a night around Park City or out on the trail snowshoeing with the family. Perfectly lightweight, super warm, great fit and love the hood. You aren't going to find a better down jacket out there to do it all!

    Great for everything

    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: True to size

    This is my favorite down jacket from Arc'teryx for many reasons, first is the quality of down they use, it is a 750 fill euro goose down so the best of the best. In addition to great down insulation it also features coreloft insulation that will ensure that you stay warm even if the down gets soaking wet.
    If you are looking for a down to do it all, look no further. This is the jacket that is recommended for around town use, as well as for skiing, snowboarding, ice climbing, or whatever your passion. It fits true to size for Arc'teryx, with articulated arms for a comfy fit.


    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: True to size
    • Size Bought: Large

    This jacket is awesome for every part of winter! I recommend getting a size larger than normal they fit really snug. I rock mine in the cold winter here in Italy and it does an awesome job on keeping me toasty. It is super light weight and packs down to almost nothing.

    Warmth without weight

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

    This is my first Arc'teryx purchase, I was considering a The North Face jacket and decided on this jacket after chatting with a Back Country rep. Although I reside in a high desert city, it still gets cold and occasionally it snows. My LL Bean Maine Wardens coat is too heavy and bulky, this jacket is perfect. I am able to layer with a fleece jacket when the temperature dips below 32 degrees for added warmth. I am very pleased with my purchase and with my Back Country experience.

    Warm enough for the beautiful places

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

    I bought this jacket as a gift for a good friend who works bell service at a hotel in Sun Valley, ID at 5900 elevation. He stands outside a lot greeting customers so he needed a jacket that would be warm enough to keep him warm while stationary and versatile enough to keep him comfortable while moving heavy luggage and running around. This jacket has exceeded our expectations.

    We've determined the temperature range for this jacket is minimum -3F to a more comfortable 40F with the sweet spot being between 15F to 30F. It has been snowing quite a bit in Idaho this season and the DWR treated down creates some water resistance for when he gets caught out in a light snow storm.

    He also uses this jacket under a waterproof shell while skiing. Any cold winds that the outer shell lets through the Arc'teryx Thorium AR absorbs. It has a nice athletic fit that is super easy to move around in and extremely light weight.

    Arc'teryx makes great technical gear.

    Warm enough for the beautiful places

    Great coat!

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

    Fits perfectly, is super light, and very warm. Both from a fit and functionality perspective, it is one of the best coats I have ever purchased!

    So cozy!

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

    This is an outstanding jacket. The fit is really nice. The length hits just at the top of my hip, and the sleeves are articulated which gives them a more contoured fit. I also love how high the collar sits. Pull the hood up, zip the collar up, and you'll stay nice and toasty warm.

    I've used this Jacket on its own and under my Mountain Hardwear Shell. In both cases it works very well and keeps in the heat.

    I haven't had any fill loss yet. But if I do, I'll follow the Arcteryx care guide instructions.

    Warm for the cold winter weather.

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

    This jacket is amazing. It blocks the cold burst of winds while I walk my dog on those cold frosty mornings. Very well insulated as it creates a nice warm pocket of air between you and the jacket. Zip down the pockets and stick your hands into toastyness! Who needs gloves when you have these pockets ? It's also super comfortable and I like the elastic bands on the wrist to keep air from coming in Overall very warm and comfy.

    Close, but adjustment hickups

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

    I have the 2014 in a medium. Fit was great - I'm 185, 5'11", ~40 chest, 33 waist. It has a drop tail, fit under a shell in puffiness and in length. Wrist elastic is sized well for my large hands and wrists. Hood fits with OR without helmet. With a helmet, all zipped up, the collar comes up to under my nose. Perfect.

    However without a helmet, the elastic hood isn't great. I think it handles cold, but I get snowdrift blown down my back and neck all the time. Lame. Needs the adjustment the Cerium SL has.

    The waist cinch on mine was terrible. But the Cerium SL didn't have this... maybe because it sucked. Most jackets have one or two pulls, and a light yank seals you up from drafts. This thing feels like I'm going to tear or break something, and needs a lot of pull for a little cinch.

    I really like the coreloft. But when I climb, I stuff my gloves in my shell to stay warm and keep pushing moisture through their goretex layer. That means I always have a flat spot of wet down on my stomach or my ribs. Coreloft here would be great.

    Or Arcteryx, why don't you offer this thing with water-resistant down like everyone else figured out? Then I would be forced to buy this thing again, supposing it had an adjustable hood and better waist. Argh.

    I really liked the weight. Nice, heavier midlayer. They didn't waste grams here, so it's just warmer.

    Oh, except with the separate stuff sack. They could have made a packable pocket, which I would really prefer...

    And dang, I forgot it leaks down for the first five months. The Cerium doesn't seem to do that, but it's a light fabric, so that doesn't quite compute...

    Close, but adjustment hickups

    Arcteryx definitely considered the 'pack in to your own pocket' method on their down jackets and intentionally opted not to use it. Packing a jacket into it's own pocket puts a lot of unnecessary stress on a zipper and lowers its lifespan. It's a fun feature, but I prefer the separate stuff sack for the sake of the zippers on my jacket.

    Light but strong

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

    Im 6'4 207lbs have a 43 chest and 36 waist and the XL fits great! I got the olympus blue and it looks cooler than the pictures. Its a darker shade of blue with even darker blue shoulders and wrists. I forget its on because it is so comfy and light. I usually wear MH but I really like the Thorium.

    Light but powerful; exceeded expectation

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

    I generally don't review stuff, but this jacket was so impressive I thought I should log in and tell you about it. I bought it for a climb up Mount Hood, thinking it would be a nice layer under my shell. To my surprise, it blocked the wind so thoroughly that I hardly had to use my shell at all. The sleeves are nice and long, so there isn't that lame gap between sleeves and gloves. It also fit well over my climbing helmet, which surprised me.

    Since it hardly weighs anything, I threw it in my backpack for a later multi-day hike in warmer temperatures, then just wore it at night when the temps fell. Its warmth/weight ratio makes it a fantastic jacket.

    In general, it is comfortable and looks pretty good.

    One caveat: the blue and yellow versions both have slightly different coloration on the shoulders and at the end of the sleeves (look carefully at the picture). I originally ordered the blue but thought the sleeves looked weird. Backcountry made the swap to a black easy, so I'm still totally satisfied.

    Cold... not anymore !

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

    Great warm jackets, wont go out without it.

    I own several jackets and when its cold outside I always pick this same one! looks good, feels great and keeps you very warm! so lightweight I even forget to take it off once Im at work!

    Cried over my Mtn Hrdw Nitrous until..

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

    My Mountain Hardware Nitrous was lifted from the coat hook of a local watering hole. I'd like to think a mistake, but after a month I needed to replace it. It was my favorite jacket. Light, warm, versatile. Searched many sites and stores, starting with backcountry. Basically, all sold out in size and color. So, had to expand options. Ordered a couple of jackets, one being the Arc'teryx Thorium. Bottom line.....What Mtn Hardware jacket? This fits better, feels warmer, especially when I walked a bit in a drizzle and has the added benefit of a hood. I wasn't sure I was going to like that feature, but it is super for running out of the house and not having to remember or think whether a hat is needed or not. You can be covered with a flick of the wrist and a hood beats a hat for warmth everytime. I am 6'1" and 162lbs. Medium fits great even with a light t-shirt and stretch long sleeve underneath. Put a waterproof/windproof shell over and you are bullet proof to 10-15 degrees. Great construction, slant pockets. The left pocket has a sewn-in pouch with a cord closure to hold wallet or cell phone. I think this would be better handled with an inside chest pocket - zippered or velcro. All in all a terrific find and better than what I lost. Thanks backcountry!

    Great Jacket to go with my Alpha SV !!!

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

    I am very happy with Arc'teryx and Backcountry ! I'll 1st start off with Backcountry and there awesome service and help when trying to purchase something. The staff is very helpful and they get your purchases out quick. The Thorium is an excellent choice, the overall craftsmanship is very well done. Zippers work very well and very easy, there is a heat guard behind the front zipper . The down is quality down and not boney feathers. The jacket is very warm and they give you enough room to layer underneath if you encounter severe cold weather. They due put plenty of down in the jacket so the ribs are full, I do wish they would have put more coreloft insulation in there designated areas, they should have doubled the amount. Over all the jacket looks great on and you will be noticed and complimented constantly.

    I'm confused with the sizing on this jacket. Is athletic fit the same as trim fit? Where does this jacket fall on Arcteryx's sizing chart?

    Hey James,

    The athletic fit is very similar to the trim fit, but provides a little more room in the shoulder and pec area - providing a little more room for an athletic-built body. The main benefit of an athletic fit jacket is that it is crafted for ultimate movement, so it's great for physical activity. As for how the jacket falls on sizing, here's a photo that compares the fit and look of this jacket compared to other similar jackets in Arc'teryx line.

    There is a sizing chart listed right above where it says "select a size" above, but let me know if I can help you determine the best size for your height/weight and measurements!

    Hey James, 
The athletic fit is very similar to the trim fit, but provides a little more room in the shoulder and pec area - providing a little more room for an athletic-built body. The main benefit of an athletic fit jacket is that it is crafted for ultimate movement, so it's great for physical activity. As for how the jacket falls on sizing, here's a photo that compares the fit and look of this jacket compared to other similar jackets in Arc'teryx line. 
There is a sizing chart listed right above where it says "select a size" above, but let me know if I can help you determine the best size for your height/weight and measurements!

    Looking for a jacket to replace my old Marmot Ama Dablam (R.I.P.). I liked the warmth level of the Ama Dablam since I often used it as a casual standalone piece, so I want a replacement that doesn't require layering when I go to my office job in the winter but also doesn't make me look like a giant puffball. Is the Thorium AR going to be noticeably warmer than the lighter weight jackets like the Cerium LT, Patagonia Down Sweater, MHW Ghost Whisperer, etc? Or should I go back for another Ama Dablam or something else in that same range? Thanks for the help!

    Hey Robert,

    The Thorium AR is a warm jacket for it's weight and will provide much more warmth than the Cerium LT, Ghost Whisperer, and other lightweight down jackets. While the Ama Dablam may be warmer overall, the Thorium is a much slimmer cut that does not make you look like a marshmallow. This jacket is great for standalone use and can hold up to being a daily-wear jacket. For the next step up in warmth, check out the Thorium SV and feel free to contact me directly for sizing.


    I have a desperate question as need to purchase very urgently for an upcoming trip! My hesitations are between Thorium AR and Marmot Ama Dablam. Which one will you reccomend for colder weather and generally more use in the winter?

    The Thorium AR uses 100 grams of 750-fill European grey goose down. It looks like the Ama Dablam uses 800 fill goose down but I'm not sure how many grams(?)

    The Thorium is designed as a stand alone or layering piece and is my go-to winter puffy. It's extremely durable and fits incredibly well. I wear it daily around town and will layer with it on colder ski days.

    The articulated sleeve construction allows for a much nicer fit than a tube-type sleeve construction.

    The Thorium AR also features Down Composite Mapping - which uses synthetic Coreloft insulation in areas prone to moisture build up: hood, collar, hemlines, cuffs and armpits.

    If you're looking for the next step up in warmth, checkout the Thorium SV:

    I had bought `Marmot Megawatt `, the size S fit me perfect, so will the S size of Arcteyx fit me?

    Hi there. What size is recommended for 6', 155lbs, fairly slender build? Is this style of jacket meant to fit closer to the body than older style, puffy down jackets? Also, are the sleeves meant to cut off right at the wrist versus being longer? I am tired to wearing baggy, loose clothing but don't want this to cut too tight? Any recommendations for size are appreciated.

    Hi. What size should I order if I would like to use this as a top layer with a base + heavy fleece underneath? I'm 5'10"(178cm), 170lbs(78kg) and a chest of 40" (102cm). Thanks!

    The Large should work just fine! It depends a little bit on how you like garments to fit but, the large will accommodate a 43" chest which is what I would imagine you to be while wearing a heavy fleece.

    You can call or email me directly. 801-736-6398, or

    "Can anyone speak to the warmth comparison of this jacket with the Patagonia down sweater jacket? This one weighs only slightly more but has 750 instead of 800 fill..."

    Can we please have this answered? Thanks! Also, durability and etc. I am looking for a very warm, walk around town after the slopes jacket. I don't really care about weight but care about that comfy down feel. I am also looking at the Mountain Hardwear Kelvinator Hooded which seems like a great deal, but I am wondering how much difference the 650 fill would be vs the the 750-800 for the Arc/Pat. Please share some insight.

    Thanks BC!


    Hey jas,

    I don't own these jackets specifically so I'm hoping someone else will follow up and give you some info as well. Here's a few things you need to know about down. First, if you're not worried about weight (or packability) then fill power is almost completely irrelevant to you. The warmth of a down jacket comes from trapping dead air. So, simply put, the thicker the jacket is, the warmer it will be, regardless of fill power. Fill power speaks to the how heavy and packable a jacket (or sleeping bag or whatever else) is. That being said, I find that a jacket with a lower fill power (that has a little extra weight) feels more cozy because of that weight. The kelvinator may be worth a serious look.

    The other thing to notice, is that a 'down sweater' is not going to be incredibly warm. It'll obvioiusly still be a great insulator for the weight and size, but it's going to be on the low end of warmth as far as down insulation goes.


    I am 6'9, 215 lb, 35 waist, 42 chest - any recommendations on size? I was thinking L, but didn't know if it would be long enough. This would be my first Arc'teryx item, as they seem to cater toward taller individuals, but if not, any other brand recommendations? In terms of weight, the Thorium seems perfect as I am generally hot. Thanks!


    Can someone tells me what color are the zippers on Atlantis Green color.

    On official page I noticed they are yellow but on below link I do not see this detail. Thanks!

    Thinking of buying the Thorium as an around-town/walk-through-the -park-hike type of jacket. However, people have reported that the Cerium leaks down, particularly when it's stuffed in the stuff sack. My RAB doesn't leak down, but it's more of a parka so I don't wear it for casual use. Has anyone run into issues with this particular jacket leaking down? I would imagine it's a VERY similar build to the cerium with the exception of the 750 fill...

    Best Answer

    Hey Sam,

    This is going to be a great jacket for your intended purpose.

    In regards to your question about down leakage, a small amount of down leakage is common in any down piece. However, you should not experience excessive down loss with this jacket or any other quality piece. Here is Arc'Teryx's down Guide for reference:

    If you have any more questions about this jacket or any other, please give me a call at 1-800-409-4502 ext 4446 or email at

    To add to Geoff's great answer, I have had the jacket for a year and down leakage is VERY minimal. This and the Cerium both minimize feathers getting out – with that said, expect some feathers to come out with any down product. The barbs seem to find their way between the threads and will come out, but comparably this jacket has much less than others I've used.

    Thanks for the answers guys! I ended going with the Montbell Frost Smoke parka as it had 800 fill down and I could actually justify that price for more casual wear (it was on sale). Also, I'm guessing the reason my RAB doesn't leak down is because the outer fabric is Pertex Quantum and the water resistant properties must keep the down feathers from poking through.

    Can anyone speak to the warmth comparison...

    Can anyone speak to the warmth comparison of this jacket with the Patagonia down sweater jacket? This one weighs only slightly more but has 750 instead of 800 fill... I'm looking for something to replace my boyfriend's Patagonia down sweater jacket as he recently mentioned how toasty I look in my ultra big and puffy down MH jacket. I'm concerned this isn't really going to be much warmer than what he has now.. any thoughts?

    So despite not really knowing a year+ ago if the Arcteryx would be much warmer, I ended up buying it anyways, and my husband thinks it's warmer. That may be because of the added hood option, but the thorium seems to have more loft, even after a thorough down wash for his patagonia sweater to try relofting it.

    i am 5ft 7, chest 41, waist 39, 187lbs....

    i am 5ft 7, chest 41, waist 39, 187lbs. i thought about getting the maize medium size, but turns out that theres no available size at this moment. Do you think the Large size would fit me good also? considering wearing a fleece beneath? or is the Medium size going to get in stock soon? thanx

    Probably a dumb question, but what is the...

    Probably a dumb question, but what is the best/right way to stuff this jacket into the sack? I am always afraid of ruining the down by smooshing it.

    my advice is try to work the jacket into the corners of the stow pocket. it's easy to run out of space if you haven't stuffed it into the corners. additionally, towards the end the the process, sometimes you need to compress the jacket and then finish stuffing before it lofts back up.

    Looks like the cerium lt is getting all...

    Looks like the cerium lt is getting all the praise. is the thorium really not worth it?

    Best Answer

    The Thorium is still an excellent jacket. It does use a 750 fill instead of an 850 fill, but the Thorium has a little more down volume which makes its warmth comparable to the Cerium. While the Cerium is lighter in weight they are both very compactable and the Thorium will fit into a smaller than Nalgene stuff sack just like the Cerium. Also, having tried both jackets on I can attest that the Cerium is a slightly trimmer fit than the Thorium. The Cerium is listed as a trim fit while the Thorium is listed as an athletic fit. In the end it comes down to the fact that the Cerium LT is more expensive by about $60 in the hooded version for a slightly better warmth to weight ratio.

    I am a medium in most Arc gear. I ordered the Thorium in a medium and I hope it fits. I am 5"10 175lbs and I dont like things too tight. Do you think the thorium will fit better? Someone said its like the atom SV which i like. What I do not like about the cerium is the face farbic is 20D vs the 40D on the thorium. 20D seems too weak/feathers will pluck out no?

    What is the difference between the Thorium...

    What is the difference between the Thorium AR hooded down jacket and the Celium LT hooded down jacket?

    The Thorium is a bit heavier (14.5 oz vs 9.7 oz for the Cerium), and is obviously a bit cheaper too. The Thorium uses 750 down and the cerium uses 850. The higher the number the better, though the functional difference between these two weights will be pretty hard to really notice. Really I think the differences between these jackets are pretty negligible. The Cerium might be a tiny bit warmer because of the higher quality down, and it is lighter. So it really I would say comes down to your price vs weight feelings.

    Arc'Teryx's website says that the Cerium tested just slightly warmer than the Thorium in their lab tests, but the difference was negligible. The Cerium uses less down than the Thorium, but the difference between 850 and 750 fill makes the Cerium as warm (or actually warmer) than the Thorium.

    I can tell you the cerium is warmer than the thorium by a little. Also the cerium is pretty damn durable for 20D. I was ripping a tag off some gloves and and the plastic piece tore and my hand holding the cardboard piece slit across the jacket on my chest. I looked and nothing...for sure I thought it ripped.