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Smartwool Merino Sport 150 Boxer Brief Underwear - Men's


Why We Like the Merino Sport 150 Boxer Brief Underwear

Our spontaneous, adventurous lifestyle can be paired only with Smartwool's Merino Sport 150 Boxer Brief Underwear. No matter what mission finds us, we feel prepared, even if we accidentally leave our pants behind. When snuggled into these soft wool skivvies, we have the confidence of a mountain goat to scale big walls, bag peaks, and sleep in scree beds. Just kidding on that last one. The goats can keep that one.

  • Functional high-performance underwear for active days
  • Merino wool blend manages temperature, dries quickly, fights odors
  • Double front panel provides extra support for rigorous activities
  • Wide, Merino-lined waistband boosts comfort and security
  • Flatlock seam construction minimizes chafing and discomfort
  • Item #SWL01E2

[body] 56% merino wool, 44% polyester, [back panel] 54% merino wool, 46% polyester
boxer brief
[medium] 4in
Recommended Use
Manufacturer Warranty
2 years

Tech Specs

What do you think about this product?


>Rating: 4

Fly, fly, fly away?

I've used it once or twice and have initial impressions
True to size
Size Bought
6` 4"
210 lbs

I love Smart Wool products. Have numerous pairs of their socks and boxer briefs. Funny thing happened just today though. Put on the new pair of Merino Sport 150 Boxer Brief Underwear I just received, and they felt as good as every other pair I have had. But then the funny part, right? Nature called and I unzipped to answer, but after hunting around for a full minute, I found no fly opening. Oh crap! Am I so old that I'm now putting my undies on backward? Long story short, heading for a shower at end of the day, I checked the new briefs and sure enough, NO FLY! I have since checked the write up here on and found no disclaimer or mention of the omission. Hence only 4 stars. So, buyers/flyers beware. I still love the product though.

>Rating: 3

Not Quite There

I've used it several times
True to size
Size Bought
5` 10"
180 lbs

A quality item but it misses the mark for me. If they were two inches longer they wouldn't ride up as much, which is inconvenient and hard to fix when you're in layers and on the move. I bought these for multi-day adventures, which often involve a harness, and the lack of a fly is really inconvenient when stopping for a bathroom break in these situations. If these issues aren't relevant for you then I'm sure you'll find this to be a 5/5 piece.

>Rating: 5

It doesn't really get better...

True to size

Admittedly, I'm not a big spender when it comes to underwear — at least until owning a pair of these and some by OR. These have to be the best I own: • The fit is excellent. • The fabric is super breathable • They very comfortable Smartwool has not let me down on any products yet, so it's no surprise these exceeded expectation. Naturally, they are speedy. But you get what you pay for here.

>Rating: 5

Bank = Buck

I've never been one to spend on boxers but decided to give these a go. It truly is a bank for your buck situation. When you wear these you can tell it's quality; from the waistband to the stitching. 10/10 would recommend.