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Discontinued Product!

The Klim Aggressor Brief
has been replaced by the:
Klim Aggressor 1.0 Brief
Klim Aggressor 1.0 Brief Replacement Product:
Klim Aggressor 1.0 Brief
Out of Stock
Klim Aggressor Brief
  • Klim Aggressor Brief - Black
  • Klim Aggressor Brief - 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

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.

How To Measure

W Waist Measure around your natural waistline, around the top of the hip bones, inline with the navel while keeping the measuring tape parallel to the ground.
I Inseam Measure from the highest point of your crotch down to your ankle, along your inner leg.
Product Style RevZilla Item # Manufacturer Product # Availability
Black / XS 842903 3358-003-110-000 Out of Stock
Black / SM 842904 3358-003-120-000 Out of Stock
Black / MD 842905 3358-003-130-000 Out of Stock
Black / LG 842906 3358-003-140-000 Out of Stock
Black / XL 842907 3358-003-150-000 Out of Stock
Black / 2XL 842908 3358-003-160-000 Out of Stock
Black / 3XL 842909 3358-003-170-000 Out of Stock


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We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
Klim Aggressor Brief 4.8 5 15 15
Pleasantly surprised Been looking at some other brands for a while, needed to find some relief for my seat. Found these on ZLA and decided to try them out since they were half price of the heavily advertised brand. Fit was good based on recommendations and on a 2-day trip there was a noticeable improvement compared to all other shorts/underwear I've tried. Will definitely buy another pair. October 3, 2015
Ok for short rides I own a lot of Klim gear and most of it is first rate. However this particular piece of clothing is not typical Klim quality nor do they work very well. Although the shorts appear to be well made they ride up, on me at least. They end up bunched and are really uncomfortable on longer rides. They need to be longer in the legs. In addition the material does not seem to breathe particularly well, consequently they are hot especially in the heat of an early Arizona Summer day. May 4, 2015
All day riding Great fit and they breath really well. Washout and dry overnight. Solid waist band and the crotch area is very accommodating. April 2, 2015
More comfortable than they look When I unpacked these, I thought the seams would be giving me grief after a day of riding, but no. Fit me well and didn't bunch up or stick and no pressure from seams, I think I'll buy some more! March 2, 2015
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
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