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Klim Aggressor Shirt
  • Klim Aggressor Shirt - Black
  • Klim Aggressor Shirt - Black

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Klim Aggressor Shirt

KLIM’s Aggressor Shirt provides the world’s best upper body base layer performance and is the ideal beginning of your truly Intelligent Layering System. Dress right and you’ll experience more comfort in all temperatures. With the world’s best moisture-wicking, breathable, fast-drying and comfortable four-way next-to-skin stretch material, conditions from freezing to hot will be under your control.Low-profile micro-cuffs at the wrist increase comfort, and the high contrast stitching add a technical look. Whatever condition you you ride in, the Aggressor Series ensures you’ll be comfortable and dry ride-after-ride.


  • Contrast stitching
  • Low-profile wrist micro-cuffs enhance comfort and increase mobility
  • Athletic contoured patterning
  • Anti-static comfort control
  • Breathable, moisture-wicking poly/Spandex fabric
  • Anti-microbial and fast-drying
  • Four-way stretch
  • Crew neck
  • Drop down back tail
  • Flat lock stitching
  • Tagless 

Write a Product Review for a chance to win our monthly $100 giveaways.
Klim Aggressor Shirt 4.8 5 6 6
Excellent price and Quality At nearly half the price of other brands of technical undies, I'm definitely buying more. Waiting for spring to see how they breathe in warmer weather. March 22, 2015
This shirt was a life saver....... I purchased this base layer for my trip to morocco with charley Boorman. I originally just needed it in case we hit colder weather in Africa. Well that was an understatement. Morocco had the worst snowfall in 40 years at the base of the Atlas Mountains. Needless to say I was happy to have this shirt. It kept me dry and warm under my klim overland jacket and was relieved I packed it. March 9, 2015
Typical Klim quality As with all Klim products that I've owned to date, this shirt does as advertised and is another winner. October 27, 2014
KLIM Agressor Shirt 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 Shirt 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
Maximum comfort Used with or without a mid layer, these shirts provide excellent comfort and ventilation efficiency when paired with a Goretex outer. They pack small and wear great... Ideal for longer hauls. Cleaning is also a breeze as they easily hang-dry overnight. Fit and quality are typical KLIM... Excellent. April 14, 2014
Does the job Comfortable, warm and good styling, nothing fancy, and a decent price. I ordered a second. December 3, 2012
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Have a functionality, fit, or otherwise product-specific question about the Klim Aggressor Shirt? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Klim Aggressor Shirt
Already Asked: 1 Question, 7 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
Kevin M: Great under garment. Oct 8, 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
Chris W: "Brand reputation and customer reviews on wicking capability- needed for two week road trip" Jul 20, 2014
darren a: Already have one , this is my second, wicks away the moisture very well and drys out quickly also. stops the sticky feeling. Apr 13, 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


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 Top Sizing:

Size Chest (in) Sleeve Length (in)
XS 32 - 34 24 - 25
SM 35 - 37 26 - 27
MD 38 - 40 28 - 29
LG 41 - 43 30 - 32
XL 44 - 47 33 - 34
2XL 48 - 51 35 - 36
3XL 52 - 55 37 - 38

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 842889 3356-003-110-000 In Stock: Usually ships in 1-2 business days
Black / SM 842890 3356-003-120-000 In Stock: Ships within 24 hours
Black / MD 842891 3356-003-130-000 In Stock: Ships within 24 hours
Black / LG 842892 3356-003-140-000 In Stock: Ships within 24 hours
Black / XL 842893 3356-003-150-000 In Stock: Ships within 24 hours
Black / 2XL 842894 3356-003-160-000 Out of Stock
Black / 3XL 842895 3356-003-170-000 In Stock: Ships within 24 hours