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The Arc'teryx Rho LTW Bottom uses natures finest to create a technical base layer.

Fine Merino wool makes the Arc'teryx Rho LTW Bottom soft against your skin and has a natural ability to move moisture away from your body. The Rho LTW Bottom retains its warmth even when wet should you happen to step in a river while trekking back to camp. Lycra adds performance shaping to the Arc'teryx Rho. A laminated thigh pocket is a great place to store a key, so you don't lock it in the car when you switch jackets. The Merino sheep live outside in New Zealand all year and you never hear them complain about being cold. *Available for US shipment only.

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Arc'teryx Rho LTW Bottom - Men's

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Here's what others have to say...

5 5

Arc'teryx Rho LTW Bottom - Men's

  • Gender: Male
  • Familiarity: I gave it as a gift

A gift for my son ... he instantly put them on and displayed why they were so wonderful.

4 5

Arc-teryx quality

  • Gender: Male
  • Familiarity: I've used it once or twice and have initial impressions

I avoid and hate to buy Chinese made products. Arc-teryx is producing their less expensive items there, as is the case with these. Having said that, the wool does not itch and I begrudgingly like the product.

5 5

Love my bottom.

Excellent under layer. Very stretchable. Does not give me that tight in the legs feeling I get from other products. Made to Arcteryx standard. Long leg bottom is not a problem for me and makes choosing sox easier.

2 5

Looks like I need to be taller.

I figured I'd try these first, but no luck. Looks like you need to be a very tall person to wear these. I'm 5'9" and there was a lot of leg to go. WHY Arc'teryx? Construction and feel were great, but length was extremly long. Went with the Icebreaker Pursuit Leggings instead and those are perfect!

2 5

thin long legs!

not a problem if you have long legs... the problem for me was that they are really tight fitting around my calves and that's for real! After hours of hiking in the winter one could really feel it pressing on your legs. If you have thick legs you might go for smartwool!!! much more warmer and nice and comfortable with enough elasticity for a lot of activities.

I have nothing against the garment... they are just build for a very specific type of body...

Hi these look pretty good, what size doyou...

Hi these look pretty good, what size doyou think I might need, I'm 5'10, 160lbs, and 32" waist.

Responded on

You're a classic medium in the Rho LTW, and they are good!

5 5

Well made and fit great.

Every piece of Arcteryx clothing that I have exudes quality and these are no different. It's a little strange to have a thigh pocket on an insulation layer that I always wear under a shell. But that's my only nitpick. The Merino wool is non-itch and regulates temperature well. The fit for me is great. I'm a 35" waist with 34 length and the L fits me great.

5 5

Warm and nice

Great product, however, little odd sizing, long legs but far from that it is a great product. I have size medium, and I am 178 cm/77 kg, 5'11' / 170 lbs and they are not super tight, but the legs are 5-7 cm too long....

5 5

Warm and Comfortable

I this for when I ride, hike, fish, travel, or anything involving cold weather. They are super comfortable and keep me warm in cold conditions. They are a little long and a boot cut may be better but this has not caused any issues.

4 5

The dead bird does it well

I use these for ice climbing and any snow riding. They are super warm and incredibly comfortable. I should have gotten the boot length, but they still work perfectly. The side pocket is perfect for a key like Arcteryx suggests, but i throw my clif shot in there so it doesn't get to cold and frozen. Super accessible with any side vent ski pant.

I m using a sidewinder sv pant. What I...

I m using a sidewinder sv pant. What I should wear as a first layer, a rho ar, a rho lt or a rho ltw? What is the difference? It depends on the weather conditions (low temperature)? THANK YOU

Responded on

The Rho LT is a light-weight poly blend; the LTW is wool, and the AR is a different poly blend, with some Polartec thrown in. Arc'teryx uses AR for all 'round, and suggests that "version" as either a base layer or standalone pant.

I love the merino wool base layer. It wicks beautifully, and stays warm when it's wet - great for kayaking.

5 5

Near perfect!

Got one pair this winter. They are soft and fits very well, medium, and I am 5'11, 180 lbs, 33 waist. However, they are LONG, 2-3 inches too long, but far from that they are great. Also got their LTW Shirt, but took size large, don't like when it is to tight. Fits great. Not as soft as the bottoms.

4 5

Quality Merino Wool Underwear

These undies are great. They wick well and it takes a lot to make them stinky. I am a 34" waist and a large is a tad bit big on me but I prefer my base layer to be tight fitting. If you don't mind a baggier base layer then go with your usual sizing. The pocket on the thigh is pretty useless... When are you ever going to store something under all of your other layers? It would be a massive pain to actually get to if you needed to. Only bills and coins really fit in it. I'm convinced the pocket's main purposes are to provide a spot for Arc'teryx to slap on their logo and make the garment stand out from other wool underwear lacking such a pocket.

Again sorry....! it is for ladies, Do you...

Again sorry....! it is for ladies, Do you have in any other colors? like: Brown, Beige, Forest or Dark Green, or Navy Blue, please let me know if you have it. also it is for a woman not men's ups...!Thanks.

Responded on

Arc'teryx only makes these in black. Search backcountry for women's tights you'll get a whole bunch of colorful options.

Do you have in any other colors? like:...

Do you have in any other colors? like: Brown, Beige, Forest or Dark Green, or Navy Blue, please let me know if you have it.Thanks.

Responded on

If they're offered by Arc'teryx in those colors then you'd want to jump on "live chat" and ask those folks. They'll be able to look up if they have any on order and if they do an approximate ship date.

5 5


I own two pairs of these... they fit me perfectly (I generally find that Arcteryx products fit me better that most of the other major manufacturers). I wear them under soft shell pants while b/c skiing in the Canadian Rockies from fall through spring. They regulate my body temperature very well and the merino wool is great for the no stink factor on multi day trips. I have two years of use from the first pair and no signs of wear.

4 5


These wool bottoms are great. They're not itchy. They wick moisture. And they won't stink after you sweat in them. My only complaint is that they're too big at the bottom and there's excess material below my calf. I love the covert pocket.

1 5

What am I, Manute Bol?

Sigh, I think the good people at Arc'Teryx made these bottoms for the starting lineup of the Vancouver Grizzlies. They arrived way too long, even in size small. I had to return them for the Rho Bootcut pair, and even those reach all the way to my ankles. I am fired up about the Rho bottoms though, wool is def the best way to go for insulation.

3 5

Odd sizing

Very nicely detailed - like all of Arc'teryx products - but let down by a very odd cut. The legs are extraordinarily long relative to the waist.

5 5

Warm and dry

These Rho LTW are great. I wear them with my soft shell pants. They regulate my temperature very well - warm and dry, not sweaty and hot. I have had issues with wool due to sensitive skin. No issue with these bottoms. Best buy in my opinion.