Men's Vapor Brief

Ultra-soft, quick drying, odor-free merino wool underwear.

  • Charcoal gray American made Duckworth merino wool underwear.
  • Green American made Duckworth merino wool underwear.
  • Gray American made Duckworth merino wool underwear.
  • close-up duckworth vapor wool fabric
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Men's Vapor Brief

Ultra-soft, quick drying, odor-free merino wool underwear.

Color: Coyote
Pack Size:
$49
$49   $49

At a Glance

Description

Where we come from, comfort in the right places matters.

Duckworth's Men's Vapor Brief keeps you comfortable where it counts with natural, Montana-grown Merino Wool spun and knit into our proprietary Vapor Wool fabric blend.

Our Vapor Wool is naturally antimicrobial (odor-free), itch-free, cooling, breathable, quick-drying, moisture-wicking, and oh-so comfortable. Vapor Briefs feature a functional fly and a brushed elastic waistline that's soft against skin and resists riding up.

Even in the most hot and humid conditions, these briefs are guaranteed to keep things dry and temperature regulated. American-made with American wool.

NEW FOR 2026: The vapor collection now features an updated vortex-spun yarn construction designed for greater durability, reduced pilling, and longer-lasting performance. This improvement strengthens the fabric while preserving its ultralight breathability and soft feel that continues to improve with wear and washing.

Please note: We cannot accommodate returns for opened briefs.

Fabric

Why Duckworth Vapor Fabric?

 

Composition: 38% Montana Merino Wool, 50% American Polyester, 12% Modal (beech wood pulp)

Weight: 150 gsm

Sizing & Wool Care

Duckworth Merino Wool Men's Sizes

Cold gentle machine wash with like colors. Do not bleach. Dry flat or line dry only; do not tumble dry. Can be reshaped while wet.

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Our Fabrics

VAPOR - lightest Merino Wool first layer

A Duckworth original, “The Swiss Army Knife” layer. Our proprietary American made Merino Wool base layer fabric - Vapor - is as at home on the ski hill as it is worn solo on summer’s most blistering and sunny days. Lightweight, thermoregulating, sweat wicking, odor free and quick drying. A must have Merino Wool layer for any arsenal. 

Learn More

Overall rating: 4.8067226 / 5 from 595 reviews.

AI Generated Review Summary

Duckworth's Men's Vapor Brief, made from Montana Merino Wool, offers a great choice of colors, high-quality fabric, and a comfortable fit. Customers appreciate its antimicrobial properties, soft waistband, and overall comfort, though some have mixed opinions on odor and sizing.

Summary topics

  • Color Variety: 3%
  • Material Quality: 6%
  • Fabric Comfort: 6%
  • Waistband Comfort: 4%
  • Product Feel: 10%

Review topics: [].

Review highlights

  • "The merino blend feels nice and seems to manage moisture really well." — Greg B.
  • "Love the Duckworth story and impact on a total US supply chain, fit is great, and I love the stay." — Alex S.
  • "Superb fit and quality." — Raymond I.

Reviews

Bunch and ride up

"I have a lot of Duckworth clothing and love all of it *except* the briefs. They bunch and ride up like crazy after a few washes."

— Sean (3/5)

DUCKWORTH IS AWESOME

"All of my Duckworth gear is the best of the best. And your business model sold me several years ago. Ranch to me just the way I like it. Under product use I selected other because I use it for everyday everything. But I started using it as a fly fishing guide, a hunter and a wannabe cowboy."

— Rodney G. (5/5)

Great quality, loose fit

"The quality is excellent, like everything else I own from Duckworth. The fit is a bit looser than expected, when compared to other brands. I expected them to be form-fitting, but I’d describe them as fitting somewhere between boxer brief and boxer. I’ll just take this as a sign to do more squats."

— Mike H. (4/5)

I bought one pair as

"I bought one pair as a ‘try it and see if I like it’. The jury is unanimous, it is a superb product. Fit, feel and function all were great. I’ll buy more!"

— Robert H. (5/5)

Amazing

"Comfortable for warm and cool days. Feels great while running, does not climb up the leg. I use these for daily wear and whatever comes my way. Large was a good size with a 36in waist."

— John G. (5/5)

Need XS version

"5’5 140 pounds, and the small fits a bit too loose. Wish there was a XS fit as I like them to be a little fitted. Have had to dry on high heat one time to shrink them slightly."

— Jorge N. (4/5)

"Quality & comfortable 👍👍"

— Mike (5/5)

Comfy

"Love these, baught the rest of the colors because they're so comfy."

— Drake N. (5/5)

Great pair of briefs

"Comfortable and moisture wicking. No chaffing on long hikes."

— James Z. (4/5)

Love these for the comfort

"Love these for the comfort and fit. My go to pairs of boxers."

— Henry G. (5/5)

Q&A

Any ETA on black or charcoal being in stock? Pre order an option?
At this time, we do not have any specific restock dates for this item/color
Will you be restocking charcoal color for these and vapor tee?
We will not have a restock of the charcoal color for the remainder of the year, but we will have some other color options available!
Are they American made?
They sure are! All of our products on our website are Made in the US.
What size is the med and large ?
Our size guide is based off of waist measurements! A medium is 31-33 and a large is 34-36
Waist sizing - I am a 33-34” waist in most clothing. Being between your M and L size, any recommendation for which to go with? Do they shrink up in the wash a bit?
Hi there, So I'm a 5'11", 175 lb man with a 32/33 waist, I have both Medium and Large. The reason for that is sometimes I like a snugger fit for athletic use, sometimes I like a looser fit for casual use. Really depends what you see yourself going for. They shouldn't shrink really, but remember to avoid putting them in hot water or a dryer! Hope this helps. Mike, Team DW