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  • Arc'teryx - Axino Insulated Knicker - Men's -
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Arc'teryx Axino Insulated Knicker - Men's

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10 Reviews


Ample warmth.

When it comes to maintaining warmth on extra cold days in the backcountry or at the resort, look no further than the Men's Axino Insulated Knicker to step up to the challenge. This lightweight baselayer features a boot-length construction that makes the most of your body heat, while the elastic waist band features an internal drawcord for a personalized fit. Furthermore, the Axino offers furnace-like fervor thanks to its lightweight, yet durable Fortius Air material, which is backed up by Coreloft Continuous insulation to provide a high warmth-to-weigh ratio. A DWR treatment fends off moisture-build up and precipitation, and the Permeair lining wicks away moisture and dries quickly, so you're able to keep on keepin' on, no matter the conditions.

  • An warm, 3/4-length baselayer knicker for snowsports
  • External fabric is lightweight and durable for longevity
  • DWR treatment fends off light precipitation
  • Synthetic insulation provides warmth even when wet
  • Waist band features a drawcord for personalized fit
  • Item #ARC00KN

Tech Specs

[exterior] Fortius Air 40, [insulation] Coreloft Continuous 65, [lining] Permeair 20, Torrent
Insulation Weight
Claimed Weight
9.5 oz
Recommended Use
skiing, snowboarding
Manufacturer Warranty

Tech Specs

  • Reviews
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Nice, but go up one size!

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: L
  • Height: 5'9"
  • Weight: 163lbs

These are very nice knickers, exactly like the Proton Lt, but go up one size.
I'm a solid 32 waist, 5'9 bought a M two years ago an they always were too tight.
Got a pair of large and they are perfect. I went through the same experience with
the Proton AR Hoody, L is way way better.

So so

    I’m probably right between a medium and a large. Bought bought but only kept the large as the medium was a too tight. The large is a bit baggy, which is ok, but the elastic around my calves is very loose and the legs therefore slide way up under my shell pants leaving the lower part of my leg exposed. Waste band is pretty marginal too. Not up to Arcteryx standards if you ask me. That said, they are warm but not too warm - great concept, but poor execution?


      Pretty warm but not super warm. I wear them under my shell pants when it’s colder but when it’s below 10 degrees I still need an additional base layer. The sizing is also a bit funny. I’m 5’10, 170 lbs. and the medium was a bit small and the large a bit loose. I went with the large but then the elastic around the calves is way too loose.

      That sizing tho...

      • Familiarity: I returned this product before using it
      • Fit: Runs small
      • Size Bought: M
      • Height: 6'1"
      • Weight: 180lbs

      Don't really have much to add, just a reinforcement of other reviews. Waited a long time for a product like this (Why? Seems like such an obvious market gap). Super excited for these when I saw them hit Arc'teryx's website. But the sizing. Oh the sizing... The waist actually was fine for me and it's the same waist found in their Soleus running shorts which are my all time fave. But the crotch and quads are very tight. I feel like I'm a fairly lean guy, maybe a bit more muscular in the hips, glutes, and quads than the average Joe but aren't all skiers? It's not like I squat 400+ lbs or anything. And these just didn't leave any room for normal athletic movement. Ironically, you'd need tree trunk calves for the boot cuff to be an issue. Also, as others have noted, the crotch zip is way too small and pretty much useless. Anyway, returned the M and bought a size L and the waist was too baggy and the quads were still tight, although manageable. The drawstring was pretty ineffective though and I just did some light air squats at home and could feel them riding down my behind under my bibs. Just wasn't in the cards I guess. Shame, great material, boot cuff, and waist. Pocket was a good size and location. Hopefully, they tweak the cut as it's far from 'athletic'. I have about 5 pairs of various bottoms from Arc, all M or 32 and this is the first time I've ever had an issue. Even their Alpha Comp which claims to be a 'Trim' fit in the M fits me well, I love those pants, so it was very strange / disappointing about the Axino. So close. Maybe Patagonia will make a skier version of their Nano-Air pants...

      Perfect- but size up

      • Size Bought: xl
      • Height: 6'2"
      • Weight: 200lbs

      Bought a large, sold them and upgraded to an XL size. I have a 36" waist and petite hind end. Couldn't believe I had to go XL but here we are.

      Biggest downside: the overall fly opening is SO tiny. Hard to find the bits and pieces and get them out for a bathroom break.

      Great layering piece though. Used inbounds resort riding in cold weather- perfect! Great warmth and air exchange. No bulk on lower leg with ski/snowboard boots.

      Toured in them in cold cold weather (4 F). No problems at all. Comfy warmth without overheating on a 5 hr tour. No soggy moisture inside!

      Perfect layer for those COLD days!

      • Familiarity: I've used it several times
      • Fit: Runs small
      • Size Bought: medium
      • Height: 5'9"
      • Weight: 170lbs

      Love this knicker for those bitter cold resort days when your standard base layer isn't enough. Great face fabric slides nicely under shell pants and doesn't bunch up. Love everything about these other than what has been expressed in previous reviews, they do run a bit tight. With that being said, once they are on they fit fine and feel great. Highly recommended over double layering base layers on bitter cold days!

      Awesomely warm

      • Familiarity: I've used it once or twice and have initial impressions
      • Fit: Runs small
      • Size Bought: Small
      • Height: 5'4"
      • Weight: 120lbs

      Bought these for my wife. Here's her review:
      I agree with other reviews that these run small. The men's small fits me perfectly and I typically wear a small in women's sizes. As far as functionality, these pants are incredible. I tend to run a little cold generally, but not with these babies. They don't feel bulky under my ski bibs and kept me super warm during my 3 degree ski day. Also impressed that when my upper body was overheating after more strenuous ski runs, I still felt comfortable on the bottom. These will quickly become my go to for cold resort days for sure.

      Awesome, except they don't fit

      • Familiarity: I returned this product before using it
      • Fit: Runs small
      • Size Bought: Large
      • Height: 5'10"
      • Weight: 180lbs

      I really wanted these to work, but they are too tight around the hips. They don't have much stretch and they are not cut for someone with skier legs. I'm 5'10", 180lb, and tried a large. I like the grotch gusset, zipper fly, slick interior and exterior fabrics, the breathability, and the singular pocket. Full separating side zips is the only missing feature IMO. Also, just for comparison, the Axino pants feel moderately insulating, the Nano-Air Lights are a little less insulating, and the Norrøna Lyngen Alpha100 are even less than the Nano-Airs.

      Update: I also bought the XL and while the waist is huge, everything else fits just fine. The draw cord can bring the waist in enough, and no one will see the bunching since they're a midlayer.

      Try Before You Buy

      • Familiarity: I've used it once or twice and have initial impressions
      • Fit: Runs small

      I wanted to like these a lot as they looked to solve a dilemma I've had in having to tuck fleece pants into my boots. They are designed very nicely and I'm sure they're very warm. But, the sizing seems off to me.

      I have a 32" waist, making me a medium in Arc'teryx (as I am in their Theta SV bibs). But, these are way too tight around the waist and not nearly long enough. They barely cover my knees, leaving a 6+ inch gap between the cuff and my boots.

      I highly recommend trying them on before you make a purchase.

      What is the inseam on a large? I have a 36" inseam and want to make sure they will actually reach my boot tops.

      Inseam length for size large: 55.2cm/21.7”

      I'm a pretty true size medium and found the length to be perfect. The inner cuff stops right around the top of my boot. I'll pull it over my ski sock and get great coverage.