Smartwool Microweight Boxer Briefs - Men's


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Put a lightweight, soft, sweat-wicking layer like the Men's Smartwool Microweight Boxer Briefs on first, then work outward for versatile performance. These boxer shorts are made from merino wool and spandex for a body-hugging fit that stretches and helps regulate temperature and moisture. Flatlock seams are made with Seamsoft ® thread for exceptional smoothness that won't have you turning back early due to chafing as soon as you get your sweat on.


  • Fabric: NTS Microweight 150 g/sq m; 96% Merino Wool, 4% Elastane; Jersey knit
  • UPF 50+
  • Coats Seamsoft ® thread on flatlock internal seams for exceptional smoothness and comfort
  • Fully functional fly with contrast color bartacks at fly opening
  • Logo elastic waistband with wool terry loop next to skin
  • Machine wash warm, tumble dry low, or line dry for best appearance
  • Form fit – Mid Rise
  • Inseam: 4.75 in, 12 cm (size M)
  • Weight: 100 g, 3.53 oz

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Review Summary

5 out of 5

7 Reviews

  • Build quality: 3
  • Great design: 2
  • Performance: 2
  • cool in summer: 1

  • Cost: 1
Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5
Fit: 4 / 5

7 Ratings & Reviews

Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5

Under 18 yrs

Krazy Komfy Underwear
April 05, 2012

I just got these the other day and wore them out running and on a short hike. These underwear stayed nice and dry and are definatly the dryest underwear I have ever worn. Definatly going to by some more for my Rayado trek at Philmont this summer. I have only owned them a few weeks so I can not really speak to their longevity but seem like a quality garment as always from SmartWool.

Pros: Build quality, Performance, komfy, kozy
Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5
from Vancouver, WA
25-34 yrs

Great Fit
October 18, 2011

Fit is great on these and they are extremely comfortable. I tried these out for the first time on a long all day hike and they performed great. I look forward to using these for ski season. I would highly recommend.

Pros: Great design, Build quality, Performance
Comfort: 5 / 5
Durability: 4 / 5
Quality: 4 / 5
FitClothes: 4 / 5

25-34 yrs

April 08, 2012

I'm comparing these to Ex Officio Give-N-Go boxer briefs since those are the competition in my wardrobe. They're a little looser than the gng's but the body-feel is nicer. The smartwool breaths and eliminates moisture better than the gng's in damp weather. After a few wears they've already started to pill, so they're less durable than the gng's.

Pros: Ease of use
Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5
from Idaho
25-34 yrs

These Are Great!
October 15, 2012

My Husband Loves These Boxers. I am sure these are the only ones he will buy from now on. They fit very well. The fabric is some of the softest I have ever felt in underwear.

Pros: Great design, Build quality, Performance, Ease of use, Great value
Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5

from Nashville, TN
35-44 yrs

Fanatastic product!
December 09, 2011

I essentially live in these boxers now. The fit is great, with the micro-weight being light enough to avoid being obtrusive in layering- "wafer-thin" really. They stay in place, no riding or bunching up while active. They appear to be resisting odor/funk - or at least i haven't heard any off-hand remarks after multiple days of wear (while traveling light and not in any place to wash them). The weight seems to be light enough that they will likely move beyond winter and well into the summer months, given that wool breathes and cools as well. I compare these with my Icebreaker boxers, but the much thinner fabric make them more of a go-to garment for my day-to-day needs. Overall, i highly recommend these and will be buying more of them soon.

Pros: Great design, Build quality, Lasts forever, Performance, weight
Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5
from Tucson, AZ
25-34 yrs

Great quality
January 24, 2013

These underwear fit great and are of high quality. The material is thin but I have put them through many wash cycles and they still look new. They are a bit warmer than cotton underwear, but I use them for cool weather activities so that is not much of an issue. Performance is otherwise great, as expected.

Pros: Build quality, Performance
Comfort: 5 / 5
Durability: 5 / 5
Quality: 5 / 5
from Southern California
45-54 yrs

Best Underwear Ever
December 20, 2012

I bought these for winter sports (I am a Spring skier and hate long johns) but now I wear them every day of the year. Way more comfortable than cotton. Hold their shape and don't stretch out. Only gripe is the price, but since I throw the cotton ones out after a year, I guess it kind of balances out.

Pros: Build quality, really comfortable, cool in summer, warm in winter, Cons: Cost

Also Available

Smartwool Men's Microweight Boxer Briefs Photo

Alloy, Black, Cadet Blue, Chino and Silver Gray.

Available sizes, while supplies last, include size small, size medium, size large, size extra large and size extra extra large: s, m, l, xl, xxl.

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