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Klim Aggressor Brief
  • Black
  • Black

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Klim Aggressor Brief

KLIM’s Aggressor Brief is the most comfortable, non-padded riding short KLIM has ever created. Utilizing the same moisture-wicking, breathable, fast drying and ultra-comfortable four-way stretch material as the Aggressor Shirt and Aggressor Pant, this low-profile short will soon be your favorite riding brief for all temperatures and all rides. Choose your next-to-skin layer intelligently and you’ll be drier and ready for more miles every time.


  • Contrast stitching
  • Patterning removes in-seam seam for ultimate riding comfort
  • Athletic contoured patterning
  • Anti-static comfort control
  • Breathable, moisture- wicking poly/Spandex fabric
  • Anti-microbial and fast-drying
  • Four-way stretch
  • Non-abrasive elastic comfort waist
  • Flat lock stitching
  • Tagless
  • Front fly
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Klim Aggressor Brief 4.9 5 11 11
Comfortable riding garment These briefs are very comfortable and breath well. October 27, 2014
Great product! I've been using these for a few months and have zero complaints the fit & feel is great. No bunching, breathes well. September 12, 2014
Comfy and dry Keeps me dry and are comfortable. No bunching up either. Nice true fit I would recommend this product. September 1, 2014
No comprimise.. pure comfort Klim Agressor is the best short I've ever used. I definitely recommend this product for adventurers. It's elastic, breathable and fits well. August 20, 2014
Great for summer Bought these to use riding in Big Bend Texas in July. These Klim aggressor briefs were very comfortable in 100+ temps in the desert. I wore jeans over them. July 15, 2014
Road tested I bought a couple pairs of these to try on a recently completed ride of a little over 1800 miles. I probably own 3 or 4 different brands of riding shorts and these just went to the top of the list. Very comfortable, no chaffing, great fit and feel, as well as a good price point. I'm thinking I may need to order a couple more pairs from ZLA. Highly recommended. May 26, 2014
Very Comfortable Did a quick 250mi ride to try these babies out right after buying them. They performed great and never experienced the typical issues associated with other garments. Don't have to be on the bike to appreciate them either. So comfortable I'm considering buying a pair for every day of the week! I will spare everyone by not uploading a photo. April 6, 2014
very comfy These pants are great! They don't hold all that moisture and sweat like cotton. Fast drying and no thick seams. I wish they came in Nacho Libre colors but no, only ninja black. HiYaa! January 20, 2014
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Have a functionality, fit, or otherwise product-specific question about the Klim Aggressor Brief? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Klim Aggressor Brief
Already Asked: 3 Questions, 24 Answers
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RevZilla Store asked: Why did you choose this?
Ryan B: Have purchased them in the past and they work great. You don't know what you are missing until you try them. Feb 8, 2015
Cindy K: Purchased as a gift for son-in-law who is an avid motorcycle rider, snowmobiler, and snowboarder who has always wanted Klim apparel. Dec 13, 2014
D A: I have a pair of LD underwear, which I find are too tight. These are excellent. I tested them against LDs, my regular Duluth 'Naked' boxers and another pair last weekend. They came out on top as the most comfortable by far. Nov 3, 2014
Kevin M: Not my best purchase. Oct 8, 2014
S T: Thought I'd try something other than cotton underwear to see if it made that much difference on a mid to long ride. Sep 27, 2014
William H: Riding to Big Bend, Texas in July. Needed comfort for long ride in hot weather. Sep 10, 2014
Chris W: Brand reputation and customer reviews on wicking capability- needed for two week road trip Jul 20, 2014
Scott L: Good user reviews from other customers. Jun 23, 2014
Andy F: There comfortable and last a long time. Jun 14, 2014
Lukas v: Worked great in 108'F weather. Very comfortable. Jun 2, 2014
Jeff S: All the briefs rated well, but these had a front fly. May 23, 2014
Stacy T: the seams in the crotch drive me crazy. LDcomfort shorts work better. These are just cluttering my sock drawer. May 8, 2014
darren a: 2nd pair , very comfortable and seem to help with the monkey butt Apr 13, 2014
JOHN R: The seams on my tighty whities were killing me! Jan 12, 2014
Jim M: Comfortable and will dry over night when I wash em out at the end of a day. Sep 9, 2013
John R: Long range comfort and Klim reputation for quality. Sep 9, 2013
David C asked: Which size would I get with a 34" waist? May 24, 2014
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Gail B: I have a 34 waist and wear the Medium. Just a note, I have a slim legs. May 24, 2014
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Jeffrey A: Medium fits

32-35" waste
156-186 lbs
May 24, 2014
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darren a: Medium Jul 9, 2014
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J C: Large. May 24, 2014
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A shopper asked: Are they true to size? if so, what is Klim size chart? Mar 22, 2014
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Gordon M: Yes they are true to size. I have a 33" waist and medium fits perfect. I am not sure on the Klim size chart sizes. Mar 25, 2014
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Ryan B: I ordered the same size that I wear in similar style Haynes underwear. They fit as they should. May 15, 2014
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michael l: Yes I am a 36 to 38 pant and a large is fine Mar 23, 2014
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JOHN R: They fit spot on! Apr 1, 2014
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We highly recommend finding a cloth tape measure and taking the time to take these measurements.  Klim sizes will not necessarily correlate with fitment in other brands.

Klim Men's Base/Mid Layer Pant Sizing:

Size Waist (in) Inseam (in)
XS 29 - 31 29
SM 32 - 34 30
MD 35 - 37 31
LG 38 - 40 32
XL 41 - 43 33
2XL 44 - 47 33
3XL 48 - 51 33

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

Click here to see the full Klim Size Chart
Product Style RevZilla Item # Manufacturer Product # Availability
Black / XS 842903 3358-003-110-000 In Stock: Usually ships in 1-2 business days
Black / SM 842904 3358-003-120-000 In Stock: Ships within 24 hours
Black / MD 842905 3358-003-130-000 In Stock: Ships within 24 hours
Black / LG 842906 3358-003-140-000 In Stock: Ships within 24 hours
Black / XL 842907 3358-003-150-000 In Stock: Ships within 24 hours
Black / 2XL 842908 3358-003-160-000 In Stock: Ships within 24 hours
Black / 3XL 842909 3358-003-170-000 In Stock: Ships within 24 hours