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Style# 40123

9" Sports Boxer Brief

Average rating of 97%


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Purpose Built

Flexible, confident, and designed for all day comfort, the 5.11® Sports Brief utilizes our 3D-Wicking technology to pull moisture away from your skin, keeping you dry and focused during periods of high exertion. The athletic fit offers enhanced support and free movement, while an extra wide 1.5 inch elasticized waistband ensures secure and reliable wear. When you need high performance, moisture wicking, quick dry underwear that won't slow you down, the 5.11 Sports Brief is the right choice.



  • Enhanced comfort during heavy activity
  • 3D-Wicking Technology
  • Extra-wide 1.5 inch waistband



  • Poly/spandex quick-dry fabric
  • Athletic fit
  • Available in Black and White


Product Reviews

Ratings and Reviews


(based on 29 reviews)

97 %

Always working doubles...


From Double Down

from Belleville, Michigan

I already own a pair, and the tshirts, and the boots, 511 puts out a great product, but these are a bit over priced, for civel service workers.

they work well


From sushi

from las vegas

The best I have used, and I have tried them all. They keep me from chafing, and last a long time. Plus they come in 3XL size, to cover my big you know what.

Won't cut off circulation


From bmclaughlan

from Detroit, Michigan

Unlike some of the UnderArmour products, these undershorts provide support without strangling your thighs or putting excessive pressure on your lower back. They stay in place.

High performance


From Coach Bruce

from Michigan

The longer thigh length provides welcome hamstring support without being intrusive. Waistband is very comfortable and doesn't roll.

5.11 Rocks!


From Rc-Pile-It

from Beautiful Colorado!

These are awesome! Fortunately I didn't know the price until after purchasing, or I probably wouldn't have even tried them, but now it's all that I will wear! 5.11 did it again! Like their "Utili-tee's", they took an everyday thing, slightly redesigned it and made it 100% better! Don't think twice, just get a pair, wear 'em, and you'll be buying more!!!

Best boxer briefs ever


From Ed

from Boston, MA

I have worn another brand for about 7-8 years now, I just got a couple pairs of these last month and I am now going to get 10 more pairs to replace the old ones. They are comfortable, they stay put, and keep things where they should be. I highly recommend!!



From big Iv

from NYC


Three month trial. Buying more.


From Philip

from Wyoming, RI

I read all the reveiws but had a hard time getting past the cost. I finally took the plunge and I'm very happy I did. Much more comfortable than regular boxers or inexpensive compression shorts. They're worth every penny. I just ordered two more pair, and will be replacing all my underwear with these.

Perfect Comfort and Fit!!!


From Everyday Pete

from Modesto

I was recommended to these particular briefs from a person in the medical field. I started with one as a gift and then ordered 10 pairs to have. I got rid of all of my other brands. These are lasting, breathable, comfortable, and on and on and on............ Comfort, that never runs up on your leg and that keeps things put. Will never use any other brand.

lacking support


From cmac

from CO

I like the waist, length and leg compression. But I found that it lacked the proper support where I needed it. The legs have the feel and length of a nice workout compression short. But the boys just didn't get any support, as it felt like an old time boxer in the midsection. Was hoping to find a boxer brief for high activity levels, but was disappointed.

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