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  • Arc'teryx - Theta SV Bib - Men's - Black
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  • Arc'teryx - Theta SV Bib - Men's - Black
  • Arc'teryx - Theta SV Bib - Men's - Legion Blue

Arc'teryx Theta SV Bib - Men's


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    16 Reviews


    A tough-as-nails bib for those who hate summer.

    Arc'teryx gave the answer with the Men's Theta SV Bib. What was the question, you ask? Alpine professionals asked for a pant that would deliver protection from the elements in four seasons of wet, nasty weather. Ask and ye shall receive! Look towards this bib if you need a tough, full-coverage pant for expedition mountaineering, serious backcountry skiing, or alpine climbing.

    The Theta SV Bib is built with waterproof breathable Gore-Tex Pro fabric laminated to the N80p-X nylon, sealing out any adverse weather while being a supple and notably soft to the touch. Reinforced paneling of N15-p-X shell fabric in the knees and butt is burly enough for any adventure, and the reinforced Keptrotec instep patch can take a nick from a crampon or two. The high-rise bib is an alpine classic; a streamlined profile with an integrated elastic waist to keep warmth in and snow and drafts out, and a full drop-seat option that does not require removing the suspenders and is compatible with harnesses make it a no-brainer. The Cordura powder cuff seals out the snow, and the full separating two-way zippers let you vent as needed or remove the bib over boots with ease. Now, the only question alpinists are asking is, "What mountain should we conquer?" You're on your own there.

    • Gore-Tex Pro Shell membrane (3-layer)
    • N80p-x shell fabric with 150D reinforcements
    • Full separating two-way zippers
    • Adjustable low front bib with adjustable suspenders
    • Drop-seat design
    • Keprotec instep patch
    • Cordura powder cuff
    • 2 small zippered pockets on bib
    • Item #ARC3656

    Tech Specs

    [membrane/laminate] Gore-Tex Pro, [shell] 80D nylon, [reinforcements] 150D nylon, [instep patches] Keprotec
    fully taped
    Expedition e3D (room to layer)
    2 zippered bib
    elastic, adjustable suspenders
    Side Zips
    yes, full-length
    Claimed Weight
    [M] 20 oz
    Recommended Use
    skiing, backcountry touring, alpine
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?


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

    Bought these because they fit the best. I don't understand, however, why they don't have pockets or some of the features that other bibs (i.e. OR) offer.

    Built to last

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

    Got these for my husband and he's totally impressed. Fit is great and seams are completely sealed. Used a few times skiing and sledding, in wet Oregon snow. Will be used for several seasons.

    Expensive but impressive

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

    I have put these bibs through the ringer, so to speak. When I am not working, I use these bibs for backcountry skiing and wet weather hiking. When I am working, I use these bibs every day as rain pants in the rainforest of far western Washington (I am a forester and am in the woods 6 inches of rain or shine). Here are my notes:


    These bibs are not downpour proof. I have used many different brands to keep me dry in the woods in my career, and can easily recognize the difference between perspiration and leakage. When I wear these and it is really coming down, my crotch and knees get wet. The zippers and lightweight material were not designed to keep steady streams of water from penetrating the fabric and crotch zipper. I have owned <$100 hiking rain pants that have performed equally if not better in downpours, although these bibs are more durable.

    After less than one year of use, I have developed two large holes, one on each cuff, from repeatedly kicking branch stobs and from ski edge abrasion. Please note that I am not necessarily holding this against the bibs because I fully understand that I use these things for some of the harshest off trail brush and slash travel as you can imagine. I have found the seam between the reinforced kickstep and the regular material to be the weak point.


    The articulated knees and crotch are simply awesome. I can drag my long legs up and over downed logs and lift my knees as high as I need to without the slightest bit of bind or pressure. These things are very comfortable and can be adjusted to fit exactly how you want them to.

    The breathability is better than I found with any other garment I have owned. I can be moving fast uphill all day without sweating through my cotton pants (other than the leakage points described above).

    When I use these things for skiing, I am always impressed. The great breathability, flexibility and comfort make them a joy whether I am cruising down the groomers or skinning in a blizzard. I have yet to find a snow day where the rate of frozen precipitation is greater than the gore tex can shed, although when it rains, it is a different story. The inner gaiter keeps all snow out and prevents the bibs from riding up my leg while hiking.

    The bottom line:

    Used solely as ski pants, these things will exceed your needs and will never let you down. As rain pants, look elsewhere (something cheaper will do just as well). If you need a pair of bibs to operate as a go to ski/ mountaineering/ hiking/ workwear shell layer, these may be the best compromise I have found, although they are not quite as durable or waterproof as I wish. Not sure I will ever find a pant that is, but I did pay nearly half a thousand dollars for these...

    Hope this helps

    Almost perfect

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

    I have used these pants for a year now, and can attest to their waterproof quality, as well as their durability (trees, rocks, ski edges, walking around town...and they still look new). I will say, though, that the chest pockets are, to put it simply, darn near useless. My small wallet is a snug fit, and don't bother with most smart phones. They seem to be made for a 3.5" knife or multi-tool. I would like to see these pats come with slightly larger pockets, as well as an updated seam pattern to allow for a bit more mobility while skinning or climbing.

    Overall, a quality product.

    Seams Blow Easily

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

    Blown Zipper seam on the leg side zipper. Arcteryx says this is normal wear and tear and says the best they can do is charge me to repair it. Other companies would be happy to replace their product no questions asked when shown a manufacturing defect like this. Not Arcteryx. They do not stand behind their products.

    Seams Blow Easily


    Judging by the date on the photo, I would say it was anywhere from Jan-Feb. I did not use these more than 4 times before the seam blew out. If you guys could help me with a warranty claim with Arc thatd be great. Ive tried several times to get a replacement pair and they gave me the "F you." Saying I should pay to repair it. Was planning on taking these to Denali but ended up going with softshells. No way would I trust this stuff on any sort of multi-day climb or ski.


    Great for touring

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

    I've used these pants inbounds and out. The lack of pockets makes them less than ideal for me for inbounds skiing. These pants really only have enough space for keys and some lip balm. Everything else will need to find a home in your jacket.
    For touring, however, they are great. I was able to dump plenty of heat on the way up with the side zips. And I felt well protected in a stiff breeze at the top. They are incredibly light. If you're worried about trimming ounces from your set up, these are the ticket.

    Bomber Bibs

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

    Have used this item on several ice climbing/backcountry touring multi day and single day trips/resort skiing days and it has been great all around. If it's a cold day, layer up underneath. Pockets are small, but you don't really want that much when you are touring and moving fast in the mountains; they afford enough room for a camera, some dermatone, and a cliff bar. Just barely fit over ski boots. I am 6 ft 180 lbs and a medium fits great-- tight enough, and articulated to high step while touring, yet loose enough to layer up during cold days at the resort.

    We'll built, keeps you dry.

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

    After a winter season in Colorado of skiing and climbing, these are a great bib. Bomber construction, they fit well, the superb water profess and breath ability of the gore pro fabric is excellent! Really is guaranteed to keep you dry. They are also light weight and very pack able. If they ever wear out I would most certainly get another pair!

    Disclosure: I am a Member of the gore mountain techs community and

    Seasons of comfort

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

    From the depths of winter through the end of spring, this bib will protect you from what ever Mother Nature throws your way. To warm, unzip the full leg zips to vent and cool off. If it is a -20 day, there is plenty of room to put on your extra thick pair of baselayer pants to keep you toasty. I have put these through the wringer. They are strong, durable and comfortable. My only complaint is the pocket space. Plan on only fitting a few very small items if that in them. 1 pocket will fit my Iphone (barely) and the other I usually keep a bard or some chews. Fit is pretty true to size. I went with the large over the medium because I do not like a euro fit but I could easily wear the medium. I mostly use these bibs for split boarding but I would use them for any form of mountain travel where snow is encountered.

    Size Large Reg

    5'8" 170lb

    32-33 in waist

    Seasons of comfort

    Great Bib

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

    I just picked up a pair of these bad boys for splitboarding. They are awesome. Great protection form the elements in a lightweight durable package. I love the full leg zips for venting. I went up a size because I'm not into the Euro fit. They are baggy enough that they do not ride up.

    High performance in tough conditions

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

    Awesome bibs and perform awesomely well in harsh conditions. Pockets are tiny, but I think that's the point (its not a great place for weight when climbing / skinning). Gators seem to be wearing a bit quicker than expected but I have really treated the pants with zero respect. Only small compliant, per the below, is a bit of crotch crunching but that doesn't seem to bother me much when in the mountains. I am 5' 9 1/2", 175 lbs, 33-34 waist and wear an M. Fits great

    Design Flaw...

    • Familiarity: I returned this product before using it
    • Fit: True to size

    I ordered these based on my previous experience with Arc'Teryx. I own several other Arc'Teryx products that I love and use routinely.

    The Good- These bibs are extremely light weight and well constructed, the fit is athletic, and they look pretty slick.

    The Bad- The pockets... I knew this going in, but it really doesn't hit home until you put them on for the first time. More pockets, deeper pockets, or simply no pockets at all would have made more sense to me.

    The bigger issue was one that's mentioned in Cory Akin's review. The suspender length is not enough. Extended all the way out, the Theta SV's still tugged in the groin and went right up the backside every time I bent over. Not fun in my living room, much less fun in the backcountry. I'm 6', 185lbs, size large.

    A solid product with some major design flaws. Ultimately, I returned mine and will keep searching.

    Regarding your complaint about the suspender length, perhaps you should try them in Large-Tall before writing them off altogether. Arc'teryx makes the Theta SV in short and tall and I thought I would have needed the short as I am 5'10 and normally have to hem pants to my 30" inseam, but the medium-regular fits me like a glove.

    Great pant ok fit

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

    6'1" 190 lbs Size Large

    These bibs are thin, light and durable. I have owned these for a season now and they are my go to bib for most days. I like to layer and that is why I prefer these shells. They have absolutely no insulation, pretty much gore tex saran wrap for your lower half. I have climbed a few times in them but would probably still prefer my soft shell for ice.

    The built in gaters are weak and should have been made with a little more quality for Arc'teryx. The vents are ok but i still prefer my old Patagonia Patrol pant vents that came with mesh inside the vent.

    I would recommend these to someone who wants a high quality shell bib.

    Sweet bibs

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

    These are the first pair of bibs I've owned, and so far I'm pretty pleased. They are lightweight, seem very durable, have nice articulation in the knees. I like the fit for the most part - slim, but not overly tight. A great fit for touring when you don't need extra material hanging around, such as when you are using crampons.

    I do feel the pants are a little tight in the crotch, although not bad. Even with the suspenders fully extended, still feeling some pull in the groin while skinning. I went with the Medium, which fits great everywhere else (33 in waist, 5'11" 170 lbs). And I have tried a large, which doesn't fit that well throughout my lower half. So it seems to me this particular pant isn't quite tailored to my body, although not a big deal.

    My only gripe, although with a shell pant like this I shouldn't expect too many features, is not having a significant pocket for holding things like keys, wallet, etc when I am hitting up grocery store or gas station before heading up canyon. The pockets provided are fairly shallow and are best suited to a small snack or a multi tool, something of that size.

    I usualy buy 33/30 pants, but I like the bibs a litle bit loose to use layers. Do I buy size M or L? Thanks a lot!

    Best Answer

    Go large.

    I'm a 34/30 (5'11", 175lbs) and just picked up a large / short. Good but not perfect. Initial fit is great. That said, I 'm finding them slightly tight in the thigh, creating nominal binding with accentuated movement. Also, they do ride up a bit. Not awful but noticeable.

    I haven't come across a better fitting short inseam bib. Regardless I'm on the fence whether they're keepers.

    I have a question about sizing.

    Im 5' 10" 158 lbs, 30 ish in waist , 38ish inch hips. Athletic build with most pants being tight in the thighs.

    Would you recommend a small or a medium?


    Hey Stefan. You sound like a Small to me. I'm 6'5" 195 lbs, with a 32" waist and size Medium Tall fits me perfectly. I wouldn't worry about your thighs. While these bibs are not baggy, I wouldn't worry about them being tight around your thighs. I have larger thighs too and these fit perfectly for skiing and mountaineering.

    arc seems to make a lot of mountaineering...

    arc seems to make a lot of mountaineering models. as some features are not developed for skiing, which of their pants has most ski specific features and design. I don't wear harnesses or packs and don't want clothing designed for those functions. I want convenient pockets, zippers, and no features to relieve myself while hanging on a wall. Alpha SV? want 80d minimum

    I am 5'9", 209lbs, 37/30 pants. What size...

    I am 5'9", 209lbs, 37/30 pants. What size do you recommend?

    I'm almost exactly your size. (My vanity would have me order the size L and then return them when I didn't fit into them.... and then I'd freeze my ass off all winter out of spite).

    I'd recommend you go with the XL/Short. Should fit slightly loose which ain't a bad thing for ski pants.

    What is my best size? I am 5'10" and weigh...

    What is my best size? I am 5'10" and weigh 185. Pant size 34 x 32.


    i currently have 5'9; 195 (and loosing...

    i currently have 5'9; 195 (and loosing slowly but surely), 36/30 for pants and was wondering what size would be the most appropriate. L/R or M/R? thanks

    Best Answer

    Hi Roberto

    that depends on how fast you are loosing that weight! (congrats) if your waist is a 36 then a large/regular is perfect, If you see yourself getting down to the 33" waist neighborhood soon then maybe the medium would be a better choice for you. but more room with the large isn't terrible, more freedom and more room for layers

    i am 6'3 and have a 34inch inseam and...

    i am 6'3 and have a 34inch inseam and a 31 inch wast what size would you recommend