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Men’s Vapor Brief

Men’s Vapor Brief

Rated 4.69 out of 5 based on 13 customer ratings
(13 customer reviews)


Rated 4.69 out of 5

The functional benefits of lightweight merino wool are highlighted when you go all the way. Nothing keeps you more comfortable than all-natural, chemical free wool. Having wool against your skin that’s dry, soft, and breathable is paramount to keeping you cool where it counts. The fitted brief has a brushed waistband, functional fly and is made from our patented Vapor Wool blend. The Merino wool is all Montana grown and briefs 100% made in the USA.


SKU: DW10303 Categories: , , , ,

Slim fitting boxer brief, with full gusset, functional fly and flatlock seaming throughout.

A proprietary blend of fine micron Helle Rambouillet, and a mix of cellulose and polyester produces an ultra fast wicking and naturally cooling single jersey fabric. 38% Helle Rambouillet fine Merino, 50% recycled Polyester and 12% Modal. Gentle machine wash cold and hang dry for best performance.


  1. Rated 5 out of 5

    Great. Have been wearing almost a year, and all that they are promised to be. Usually Merino wool clothing only drawback is durability, these have been fine. Washed once a week for nearly a year, still going strong. I alternate between 2 pairs. Will buy again without question if I need more. Same experience with vapor tee shirt.

  2. Rated 5 out of 5

    I love these boxer briefs. They are hands-down the best briefs I have ever used – they are super-comfortable, soft, provide the right support, and they are not hot in the summer. I am 160#, 6’0″, and have a 31″ waist – the small size fits me perfectly (I like them more on the snug side, and not loose on the thighs). These work well when I am ski patrolling in the winter, or hiking in the summer. Love ’em!

  3. Rated 5 out of 5

    It’s all about the right fit! I normally get a medium in boxer briefs…I’m definitely a small waist but I find the fit of most briefs to be too constricting otherwise. I originally got a duck worth medium but found it to be too loose on thighs. I got a small instead and they were a perfect fit.

    The fabric itself feels great, resist odor well, and would be great for travel! The vapor fabric is hands down one of the best I’ve ever tried.

    If the fit is not quite right as some other reviewers have mentioned then do the simple thing and try another size, and you won’t be disappointed.

  4. Rated 5 out of 5

    Very comfy, soft and lightweight. Medium is a nice fit for me @ 160# 6’1 32″ waist.

  5. Rated 5 out of 5

    Wonderful product! Fits perfectly.

  6. Rated 5 out of 5

    As a ski patroler, bike patroler, and spontaneous adventurer, I wouldn’t recommend any other boxer-brief. Its ability to wick moisture, stay dry, and avoid odor is amazing. I threw out all my other boxer-briefs because I trust these so much whether I’m climbing or going out on the town!

  7. Rated 5 out of 5

    Super comfortable boxer-briefs with support in all the right places. The fabric allows for a full range of motion and the legs do not ride up at all. The slim fit also looks great.

  8. Rated 5 out of 5

    Favorite pair of underwear hands down. Size M fits me great, I’m about 6’2” 185lbs and 33” waist. Extremely comfortable! Definitely will be getting more.

  9. Rated 5 out of 5

    Love the fit. The wide band is a nice touch too. I’m 6’2″ 200# and the medium is perfect. I’ve worn wool boxer briefs exclusively for almost 10 years and these are my favorites yet. If only you keep more mediums in stock. 🙁

    • Thank you Sam — your request for more medium is in process, an fresh production is being received at our warehouse today and will be available and ready to start shipping tomorrow (11/1). Thank you for your patience!

  10. Rated 5 out of 5

    These things are great. I’ve found 100% wool underwear simply doesn’t hold up, despite the marketing claims. These things are a perfect blend. There’s no sign of wear on either these, or the vapor t-shirt I got, they dry *very* fast, they’re comfortable and fit me well. I’m 6’1″, slightly larger thighs (ride a bike every day but not like power lifting), wear a large.

    • Thank you for the review Chris!

  11. Rated 2 out of 5

    I’m rather disappointed with these. The fit is all wrong. A previous reviewer on this webpage described the underwear as being too small. My experience is just the opposite! The waist on the underwear fits me perfect, but everything else is too loose and baggy. The fit would be more akin to a pair of boxers instead of boxer briefs. There is no support whatsoever. I tried throwing them in the dryer on high heat to shrink them, and it helped a little, but they are still loose. Other than that, nice breathable material that is good for summer. I hope that Duckworth brings back their underwear made out of 100% wool because that is better for colder months.

    • Hi Brian,
      Sorry to hear you found the fit not good for you. The Briefs are designed to be a blend of boxer and brief, so your comments are fitting. We do not add elastomers (lycra, spandex) to the fabrics, and would agree that for sport and use where tighter/snugger fit is desired, adding a stretch fiber would be a good addition. We have mostly satisfied feedback on this style, and appreciate your feedback. We are in the process of increasing our offer in the men’s first layer/bottoms, and will do so with all feedback in mind. Including bringing back the 100% merino version in the briefs/boxers in the near future.
      As a courtesy, if you’d like to exchange the item for something else, please do reply to this or you can reach us at 406.922.3825 /

  12. Rated 5 out of 5

    These briefs became a quick favorite of mine; they are super comfortable and stay dry. The fact that they are made in USA is a nice perk too.

  13. Rated 4 out of 5

    Love these underwear. Would recommend them. My only gripe is that they run a bit small. I’m a guy with bigger thighs than my waist would suggest and there’s not much room for my thighs and my package in a size large. I’m otherwise very happy with the product. Keep doing what you all do!

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