Ultra-soft, quick drying, odor-free merino wool underwear.
Ultra-soft, quick drying, odor-free merino wool underwear.
Where we come from, comfort in the right places matters.
Duckworth's Men's Vapor Brief keeps you comfortable where it counts with natural, American-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.
Composition: 38% Montana Merino Wool, 50% American Polyester, 12% Modal (beech wood pulp)
Weight: 150 gsm
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.
Our Fabrics
Overall rating: 4.8097644 / 5 from 594 reviews.
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.
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"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."
"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."
"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!"
"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."
"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."
"Quality & comfortable 👍👍"
"Love these, baught the rest of the colors because they're so comfy."
"Comfortable and moisture wicking. No chaffing on long hikes."
"Love these for the comfort and fit. My go to pairs of boxers."
"If you want to feel comfortable all day, then you should get these briefs. You will not regret the purchase and I highly recommend them."
We don’t source wool, we grow it on our very own ranch in Montana. We carefully manage every step of the process, from fiber to finished garment. Sheep to Shelf.
Trust, quality and comfort are paramount, assured by the pedigree of our wool supply from our founder's ranch and select certified Rocky Mountain wool growers.
Merino Wool layers made in the country of origin of the fleece – The United States – creates value added product for our local economies, bringing heirloom jobs back.
