Treat your cheeks.

Sitting, standing, running: your butt does a lot of work, so why not dress it in the superior skivvies it deserves? The SmartWool Microweight Boxer Brief gently caresses your derriere with super cush merino wool. Naturally odor-resistant, temperature-regulating, and moisture-wicking: what more could you ass for?

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SmartWool Microweight Boxer Brief - Men's

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Here's what others have to say...

5 5

Merino? Merino? Yeah!

These are an awesome pair of boxers for hiking. I took one pair for ten days hiking at Philmont Scout Ranch in NM (to conserve on weight) and was comfortable each and every day. No chafing, no problems at all. I can't recommend these enough. They cleaned up great, which I can't say about a lot of other items I brought to Philmont...I wear them around now casually and they are oh-so-comfortable still.

4 5

Why should feet have all the benefits?

Merino isn't just for sox.
No problems in quality on mine, works great as all merino will. Great for the long haul when you can't change frequently. Especially if you're going to get wet - rain, canoeing etc - and it's cold. I feel these ride up the thigh a little more often than my standard cotton boxer-briefs, but not uncomfortably so.

4 5

Good fit, great wicking, love 'em

Bought a batch of these a year ago for day hiking in desert environments up to 117 degrees, and they lasted 12 months through heavy use on trails, and some use day-to-day as regular underwear. These are so lightweight, and the moisture wicking is so fantastic, that I swear you can't really tell you are wearing undies. There is not a lot of give in the waistband, so appropriate sizing is important, and they keep my bits and pieces where i need them to avoid chaffing, etc. After a year of use i can honestly say i never once felt any wetness during use, even on the longest, hottest hikes that soaked my shirt.

2 5

Great fabric, terrible waistband

The waistband killed these things for me. The fabric is great - standard smartwool fare - but underwear really need an elastic waist and the lack of one made these uncomfortable enough to return. I ended up going with Icebreaker Beast Boxer-briefs instead, which I highly recommend.

5 5

Amazing undies

I have been wearing boxer briefs for a while so I am use to the "fit" of these underwear. Merino wool is great because it takes a lot to make these things smell. I also wear the Icebreaker Merino briefs underneath my bike shorts and when I run. I bought one pair of these for more casual wear. They are really warm, fit great, feel great and live up to their Merino heritage. If you needed to you could easily wear these a few days in a row without any of the gnarly gross smelly weathering that would otherwise happen to cotton underwear...great for travel.

4 5

Quality Control

Really like the boxers. Fit great everywhere. I'm used to wearing wool, mostly Icebreaker, since I lived in New Zealand for over a year (returned Mar 09). Currently, I have two different kinds of Icebreaker boxers as well. I think these SmartWool fit better and are made better with one qualifier.
My only issue is quality control. I purchased two pair. Two different colors. The waist bands where noticeability different (could feel the difference) so I measured them. One was 1 1/2 inches bigger in circumference (un-stretched) than the other. The larger one fits me better. So it makes me hesitant to purchase anymore... or maybe buy only one more pair to see if I just got one pair that was made wrong.

4 5

so far so good

only had these out a few times. breath well on warmer days, pill a little after washing. best fly on ANY pair of skivies ever owned. longevity will prove if worth the cost.

Responded on

penned the comment above. here's the follow up. after five washings a sizeable hole has worn in the seat. a little more of the material wears away with each washing. I have used the delicate cycle and non phosphate detergent. I would not recommend dropping 40+ of your hard earned cash on these.

Responded on

Ross, it says there is a lifetime warrantee... did you pursue that at all?

5 5


If they were less expensive they'd be the only underwear I wear, period. they're super comfortable, they wick very well, I think they're perfect. I always machine wash them in cold and hang dry them, which makes them less convenient for day-to-day use. I'm not even sure that I have to do that--I'm just afraid I'm going to ruin them and I don't spend the $$$ to replace them.

5 5

Mighty Fine (if spendy)

pros: Great underwear--comfortable, cut close but not too close, easy to wash.

cons: Expensive.

5 5


I bought two pairs of the boxer briefs and one pair of the boxers four months ago before a trip to South America. The boxer briefs are perfect. They do not have any irritating seems. The size is perfect in that they fit close to the skin but not tight where they ride up in the legs and eventually give you a wedgie like other brands I've bought. The wool is also perfect--not hot, always feels fresh and no smell like capeline. I hand washed and line dried while in South America with no problems. As a comparison, the boxer model is also great--just fits looser and perfect when you feel like swinging a little more free that day. TK

4 5


Very comfortable, but way over priced. That is the only reason they don't get 5 stars. Also, they seem to have odd sizing. I normally wear a L but based on other reviews ordered an XL which fits fine. Patagonia is almost as comfortable and more reasonably priced.

Responded on

Update: Travelled to the Middle East in July and the airline lost my luggage. Wore the smart wool underwear for 3 days without any stink. What more could you ask for? Still overpriced but I am buying more.

5 5

Fantastic First Layer

These briefs feel like you're wearing air, keep upper thighs separated so there is no chafing, and wick moisture very well. Honestly, I was leery of paying this much for a first layer, but after using them for 9 days in 95-degree heat for 4- to 6-hour day hikes in Red Rock Canyon NV, I'm sold. I felt dry and comfortable all day, and the odor protection was fantastic.

4 5

Pretty Good.

Expensive, but very comfortable. I found that the seams were bothering me, but I started wearing them inside out, and the problem has been completely solved!

Over all, these are up there with some of the best boxer briefs, but I still prefer my Under Armour boxerjocks and even my Ex Officios over these.

Can anyone tell me the inseam length on...

Can anyone tell me the inseam length on the microweights? They look very long in the photos. Also what is the rise like? It also looks very tall in the photos. I prefer the normal boxer brief design like the Icebreakers but they have gone down in quality. I can't find any every day wear merino boxer briefs that are worth a crap anymore. Howies is the only other option for regular style boxer briefs I have seen and they are not making them now.

Best Answer Responded on

Yeah, the pictures make them look too big. Inseam length is 4". Rise is pretty standard, coming about 4" below my bellybutton. They're the best if you want a boxer brief.

Responded on

They are long, which I prefer to prevent chaffing. Although long, I find they stay in place very well and don't ride up at all.

5 5


this is the most comfortable underwear i ever tried! period! i have icebreakers and ex's but menng...this is something else,the moment i put it on i thought i had nothing on me,omg,they're so lightweight.i'm 36 and the large fit perfectly,not snug and not loose.

if i'm 36'' waist,should i go XL or Large?...

if i'm 36'' waist,should i go XL or Large? thanks!

5 5

Nice Shorts

Worked very well in high heat and humidity. Needed to wear them a few days on a trip. No odor.

5 5

Very Nice

Extremely comfortable. I had none of the chafing issues of others.

4 5

best of the bunch

i went on a mission to find the ultimate pair of wool underwear for hiking/camping style activities and these were it. few seams, the waist band is part of the garment, not a separate itchy band. the "hole" in front is probably the coolest ever invented for ease of access and general comfort. i haven't run in them for hours at a time, but i have worn them for days, and they are my favorite. four out of five just because nothing is perfect...