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Klim Aggressor Pants
  • Klim Aggressor Pants - Black
  • Klim Aggressor Pants - Black

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Klim Aggressor Pants

KLIM’s Aggressor Pant matches the Aggressor Shirt perfectly in delivering premium base layer performance. Dress in the Aggressor Pant and you’ll experience more comfort in all temperatures thanks to the world’s best moisture-wicking, breathable, fast-drying and comfortable four-way next-to-skin stretch material. Comfort is now maximized by removing the in-seam seam for all-day riding happiness. New low-profile micro-cuffs at the ankle increase comfort and the high contrast stitching add a technical look. Whatever conditions you ride in, the Aggressor Series ensures you’ll be comfortable and dry ride-after-ride.


  • Contrast stitching
  • Low-profile ankle micro-cuffs enhance comfort and increase mobility
  • 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

Write a Product Review for a chance to win our monthly $100 giveaways.
Klim Aggressor Pants 5 5 6 6
Nice buy I get those pants to help me prevent skin irritation from my riding pants, Pants are super comforted literally you don't feel them. Recommended. March 22, 2015
Excellent price and Quality At nearly half the price of other brands of technical undies, I'm definitely buying more. I wear a 34 so I got the SM and they have a compression fit. Waiting for spring to see how they breathe in warmer weather. March 22, 2015
great first layer pants Revzilla reviews are spot on. these spandex type pants, designed to be the first layer you wear, are very comfortable and warm. KLIM has three (3) pants in this category and as advertised, these are the least warm. very comfortable, very snug as they fit to my body. because they are a snug fit, there is no bunching of material or discomfort in the crotch or seat area. i also read KLIM's sizing chart and i am glad i not only read it but trusted it. they fit like a glove. Revzilla had them on sale so i now have KLIM quality at a lesser brand price. i would recommend this product without any hesitation. i currently ride a '13 bmw r1200gsw January 5, 2015
Klim Aggressor Pants I was preparing to ride to the Ohio Spyder Rally and temperatures were predicted to be cool, 40's and 50's. I ordered the Klim Aggressor Pants to wear under my riding gear as an extra layer. It proved to be all I hoped for. Very comfortable, fit was spot on, and it helped keep me warm, but still wicked away moisture and kept me dry, too. I rode over 1300 miles in five days, in cool, windy weather and stayed comfortable the whole time. October 20, 2014
Great cold weather undergarment Well made, keeps you warm, does what you buy it for August 1, 2014
The ideal second skin As I learned with the Aggressor briefs, the perfect base layer is the ideal companion. Makes long days on the bike WAY more comfortable. Their wicking properties in concert with that of an efficient mid layer (if needed) and a Goretex outer make for great comfort and ventilation. Other than the fit being outstanding, there's little more to say about a product that simply and effectively facilitates comfort. April 14, 2014
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Have a functionality, fit, or otherwise product-specific question about the Klim Aggressor Pants? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Klim Aggressor Pants
Already Asked: 6 Questions, 35 Answers
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RevZilla Store asked: Why did you choose this?
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
Richard B: warm and dry Nov 10, 2014
Daniel M: I'm about to go on a 1,000+ mile road trip and wanted some base layering since the weather is getting colder . . . Oct 2, 2014
S T: To try how these would work in early Spring and Late fall to keep warm under my Olympia Recon pants--will they keep me comfortable, not just temperature and moisture wicking-wise but to offset the "scratchy" feel of the pants on my skin. Sep 27, 2014
Sabrina S: I hate seams on my riding pants...painful! No seems and need another layer under my riding pants with wind liner for colder riding. Sep 19, 2014
Aug 11, 2014
Chris W: "Brand reputation and customer reviews on wicking capability- needed for two week road trip" Jul 20, 2014
James R: wanted to try them out Jul 3, 2014
Jashan S: Second set of the same pants and shirt (Klim Agressor) that i am getting.
Great quality. Used it for a 7500km trip and washed and re-used multiple times.
Good quality.
Would recommend.
Feb 6, 2014
David R asked: What about a siziing chart for these? Sep 24, 2014
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Darrell R: Size Large for my 36" - 38" waist fits great not to tight just right. Size large for my 41" chest is almost snug/form fit and I would not want them any tighter as I don't want a compression fit. The sleeves are plenty long probably 34" or so. Washing is a short soak and gentle/delicate cycle and hang/air dry. The fit and quality is better than the under armor they replaced. Liked them so much I ordered more of them. Sep 24, 2014
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Joseph B: They are very very close to the same sizing you wear in jeans. Helped on a recent warm rude and this did help provide some air movement on my armored pants, very comfortable. Sure I'll had a few more pairs. Sep 25, 2014
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Douglas K: David a misfire on the first, I take a 38 waist and long slim fit, the 2xl pants are an excellent fit, like most base layers are stretch fit...slim/med/lge expect will fit all... Sep 24, 2014
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Michael T: I ordered a larger size than I normal wear. I am a 40 waist and I order a 2XL that size was just about right if anything it may have been just a little big. Sep 24, 2014
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Rick M: My jeans size is 36" waist and 32" inseam. Klim large fit perfectly for me. Not a skin-tight fit but not at all loose. Just "snug". Very pleased.
Sep 24, 2014
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N A: I'm not sure if there is one. I've got a 34" waist with a 30" inseam and a medium was perfect. Sep 24, 2014
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O T: The pair I bought fit fine. My waist is 37 and large fit good. Sep 25, 2014
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Mark A: Sizing chart is spot-on. Large is a true-to-size 36-38. Sep 24, 2014
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Chris W: I am 34 w 32 Inside and LG size is perfect Sep 24, 2014
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Douglas K: David, Sep 24, 2014
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Phillip E asked: Is the Aggressor pant designed to be used with the Aggressor brief at the same time or is an either or kind of thing? May 9, 2014
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Ronald D: It's an either or thing. The Aggressor pant is simply a long version of the brief. I can tell you they are really comfortable. I wear these under my riding pants and a Klim Aggressor long sleeve top under my jacket. The top looks good enough to remove your jacket without having to then put on a shirt when you stop to eat. These seem to let the right amount of air through as you're riding. May 10, 2014
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david b: I have used these with and without briefs ( not the Aggressor brief, the material has been cotton or merino wool ), equally comfortable. When I go on a long ride I wear the seamless merino wool short underpant at the same time rather than a brief since the latter tends to chafe. My reason for wearing both the shorts and pant is mainly for hygiene. May 10, 2014
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Richard K: I own both but for me it is either or depending on how cold it is outside- the pant is just a longer version of the shorts. I suppose if you really wanted extra support you could double them up but they are basically a compression shorts like Under Armour. I never wear them at the same time. Hope that helps....
May 9, 2014
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Douglas K: I actually used the aggressor pants against the skin with KLIM tactical shorts over the top, were bit of a thermal barrier for the cooler ride I had today....... riding KTM in Mongolia and use the aggressors to stop some of the chaffing from the knee protectors and were very comfortable on the ride today.... May 11, 2014
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Joseph M: Phillip, I don't think they're meant to be used together, they'd be to bulky in the midriff area. I use them a stand alone base layer.
May 9, 2014
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david b: Sorry, I mean flat seam rather than seamless. May 10, 2014
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A S asked: Are these wind resistant? Will I get cold if I use these under perforated pants (REV'IT! Airwave Pants) at 50°/55° F? Nov 6, 2014
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Dmitriy M: They will definitely help, but they don't seem to be designed to be wind resistant. I've ridden in 50-55F in perforated pants and these on, and have been fine some times, cold others. It really all depends on how fast you're going, how sweaty you are, and how much wind protection your bike offers.

I love these and wear them all the time, but I wouldn't recommend them if you're looking exclusively for wind protection. A rain membrane for your pants might be a better choice for that.
Nov 7, 2014
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Christopher M: These are not wind resistant. They are a technical base layer (ie. really nice long underwear). Nov 8, 2014
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Jason C: Great under layer. At 50 deg. You will not be cold. Love them as a base layer. Nov 6, 2014
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Douglas K: folks, are designed as a base layer garment, I wear these under ventilated Dakar pants in the warmer months and late in the season under Traverse pants during the cooler times..... have had them out on 3 day hard rides on my KTM500 EXC Six Days, alot of standup and are great, no chaff or smell at the end of the day like cheaper synthetic base layers. Nov 9, 2014
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Jesse B asked: I want to order these but I'm not sure on sizing. any body have a good guess on size matching? i have a 30 waste. i'm guessing I'm a small, but not sure. Aug 23, 2014
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david b: I bought size L for a 36" waste so I would think that for a 30" the appropriate size would be XS. Sep 18, 2014
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Jared B: They run a little big. I should've gotten a size smaller. Sep 18, 2014
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Tyler H: you want them snug Oct 13, 2014
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Rick M asked: Will the Klim Agressor Pants worn under Klim Mojave Pants be all that effective in 85+ degree days to help keep you from ""cooking" ? My concern is that I may be just adding another layer and actually increase the effective heat factor. The same question would be equally valid for the Agressor Shirt worn under a Badlands jacket. Thanks. Appreciate all responses. Jun 22, 2014
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Simon N: I ordered this pair of pants to tryout under my BMW Street Guard 3 pants. I live here in Singapore/Malaysia and the temperatures are consistently between 25-34C (77-93F). While this pair of pants is not as warm as many others, I do find the material to be warming. It works OK in the 25C temperatures but is definitely "cooking" on the 34C temperatures. I have much better success in high temperatures with Saloman Trail Running Tights. Jun 22, 2014
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Jared B: Yes. I wear them under my Klim Badlands gear. Helps wick the moisture away and keep you dry and cool. Jun 22, 2014
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Joseph M: I haven't had the opportunity to try them in hot weather yet. Jun 22, 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 842896 3357-003-110-000 In Stock: Usually ships in 1-2 business days
Black / SM 842897 3357-003-120-000 In Stock: Ships within 24 hours
Black / MD 842898 3357-003-130-000 In Stock: Ships within 24 hours
Black / LG 842899 3357-003-140-000 In Stock: Ships within 24 hours
Black / XL 842900 3357-003-150-000 In Stock: Ships within 24 hours
Black / 2XL 842901 3357-003-160-000 In Stock: Ships within 24 hours
Black / 3XL 842902 3357-003-170-000 In Stock: Ships within 24 hours