Minus33 Men’s Acadian Lightweight Boxer Brief

With a longer 8″ inseam, the Minus33 Merino Wool Men’s Acadian Lightweight Boxer Brief is an excellent pair of underwear for adventurers.

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If you want to hit the trail for a few days, you’ll only need one pair of underwear if you pack the Minus33 Merino Wool Men’s Acadian Lightweight Boxer Brief. They have a long, 8” inseam, which is best to wear under loose-fitting clothing. The super-snug construction and thin, covered waistband also prevents any ride-up. Also, the soft, 17.5-micron fibers not only provide excellent comfort but help to prevent unnecessary chafing. Therefore, you’ll be able to explore the backcountry in comfort.

Combine all that with a UPF rating of 25, and you’ve got yourself a great pair of hiking underwear.

Note: the 170 GSM fabric may feel lightweight, but we would not suggest wearing it for physical activity over 70 – 75°F (~21-24 C).

View Minus33 company profile & sizing charts

Minus33 Merino Wool Men’s Acadian Lightweight Boxer Brief

Specs & Features:

  • 100% Merino wool imported from Australia
  • 170 GSM ultralight-to-lightweight fabric density
  • Ultrafine, 17.5-micron fibers for improved comfort
  • Compression/snug fit – but not overly tight
  • UPF Rating: 25
  • Flat-lock seams and covered waistband minimize discomfort
  • 8″ Inseam for more coverage
  • Weight: 3.5 oz (size: large)
  • 6 colors available (black, navy, azure blue, desert sand, zephyr green, & mossy oak)


  • Ultrasmooth 17.5-micron fabric & athletic fit lead raise the comfort level.
  • Longer inseam reduces leg ride-up
  • Multiple color & sizing options available


  • User-reported durability issues. Make sure to launder with care.
  • Sewn-through waistband may feel different than typical underwear. So, give yourself time to adjust.
  • Relatively expensive compared with similar Merino wool products

Best For:

Adventure | Biking | Camping | Hiking | Snowsports | Training

Featured In:

Best Merino Wool Underwear For Men

Disclaimer: To maintain genuineness and authenticity, Merino Wool Gear DOES NOT sponsor products. However, as an Amazon Associates member, we may earn a commission from qualifying purchases.

Additional information

Merino Percentage

>95% Merino Wool

Fabric Density (gsm)

145 – 180 Ultralight

Fiber Thickness (microns)



Biking, Camping, Winter Sports, Hiking, Adventure, Training

Colors Available

Black, Blue, Camouflage, Green, Navy, Tan


Form-Fitting / Athletic