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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


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 Out of Stock
Black / MD 842898 3357-003-130-000 Out of Stock
Black / LG 842899 3357-003-140-000 Out of Stock
Black / XL 842900 3357-003-150-000 Out of Stock
Black / 2XL 842901 3357-003-160-000 In Stock: Usually ships in 1-2 business days
Black / 3XL 842902 3357-003-170-000 Out of Stock


Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

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 Pants 4.9 5 15 15
All you need Got these several weeks ago to put under my Klim Overlands. With the local season changes I have had the chance to use them in 80+ and 50+ temps and find they are functional and comfortable in both. Wash easily and dry quick. A little pricey but I expect they will make up for it in versatility. Fold tight too for travel. October 5, 2015
Great base layer. I used this product across the U.S. on a 6500 mile ride. The base layer was very comfortable in most temps. I would definitely buy this product again. September 7, 2015
Just What You Would Expect From Klim These are very comfortable and fits easily under any top layer, including jeans. They seem very well made. A medium was a great fit for my 35 inch waist. August 26, 2015
Good balance, didn't retain to much heat but comfortable with knee braces Finally wore out my Moose ones and these fit the bill. Only used for a couple short rides so can't comment on durability but seem like they should last. May 18, 2015
The fit and feel is great These pants are much more superior and comfortable than traditional thermal underwear.The fit and feel is great!! I have worn these outdoors under jeans 2 hrs shoveling snown off porch,carport ,and driveway (10* to 20* with 15 to 25 mph wind gust) I stayed warm and comfortable,and at work for 8 hrs I did not get , over heated indoors,I stay dry and very comfortable ,when making transition from warm to cold, product worked really well. I have not had the opportunity to go riding with this product, because 2 winter storms hiting our area with in two weeks of each other (Sleet,snow,freezing rain). We had very hazardous road and highway conditions for almost a month . I live in southeast Missouri . I would buy this product again. Thanks Revzilla's for being a helping friend to a customer in need !! April 5, 2015
Best tights for the buck These tights offer moderate warmth and great comfort. They have a wide waist band that does not sag in the back and the fit in the crotch area does not bind. Great product for all day riding. April 2, 2015
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
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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: 7 Questions, 44 Answers
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RevZilla Store asked: Why did you choose this?
James D: I chose these because after reading the reviews I thought these would provide protection against the cold. I was hoping they would keep me warm at least to 40 degrees outside. I've warn them on various rides but do not find them protective much below 50 degrees. Nov 17, 2015
Robert M: Clearance price and great reviews as a base layer. Oct 28, 2015
Wayne C: Great price and you can't beat Klim products for quality and fit. I love my Badlands Pro Jacket and Latitude pants and Adventure gloves. Oct 27, 2015
David B: They fit and work. They do the job. Oct 18, 2015
Richard M: Liner for Bandlands Pro pants. Aug 9, 2015
Dan M: Comfort. Kim. No issues with extensive use! Apr 15, 2015
Daniel G: Looking for a good base layer that is not too outrageously priced as that is why I spent so much on a good quality adv. riding jacket. I believe Klim provides great value for money and doesn't sacrifice too much on quality. Besides, Klim is da bomb!! Apr 9, 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
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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Chris W: I am 34 w 32 Inside and LG size is perfect Sep 24, 2014
Reply to Chris Good answer? Yes (1) No (0)
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
Reply to Darrell Good answer? Yes (0) No (0)
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
Reply to Joseph Good answer? Yes (0) No (0)
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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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
Reply to Dmitriy Good answer? Yes (1) No (0)
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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Stephen R asked: I have a 36w and a 33inseam. The medium looks like the right size for the waist but short for the inseam. Which size should I get? Jul 8, 2015
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Rick M: I wear a 36w and 32 inseam; I ordered medium and they are great and fit perfectly. Hope this helps. Jul 9, 2015
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Tyler H: Large. Jul 9, 2015
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