Men's UA MK-1 Short Sleeve

Style # 1306428
Height: Size: Fit: Fitted
Mens UA MK-1 Short Sleeve
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Height: Size: Fit: Fitted
Men's UA MK-1 Short Sleeve

Product DNA

These men's training T-shirts are built with fabric that dries fast to keep you cool, and a streamlined fit to cut bulk. They're part of the UA MK-1 system—a collection of gear keeps you ready for any training situation.
  • Fitted: Next-to-skin without the squeeze
  • Our original HeatGear® fabric is super-light, breathable & dries fast
  • Mesh back & underarm panels deliver strategic ventilation
  • 4-way stretch material moves better in every direction
  • Material wicks sweat & dries really fast
  • Anti-odor technology prevents the growth of odor-causing microbes
  • Style #: 1306428
  • 90% Polyester/10% Elastane
  • Imported

Review Summary

44 Reviews
32% of reviewers recommend


Runs small Runs large


Min. Max.


Min. Max.

Not a quality shirt

Fabric is slick, but not wicking. Thin, but not thin enough.

Best fitting shirt

This is by far the best fitting shirts Under Armour has made. Comfortable too. The drop cut in the front and back is perfect! I’m tall and need a shirt that doesn’t look like a belly shirt. Keep making these UA! More colors!

My favorite work out sirts

Nice fit, excellent quality and breathable. I recommended.

Very comfortable and the length is perfect. Doesn't show my skin when I bend forward or squat.

I like the length and quality of the material. Very comfortable to wear.

Perfect for me

I totally love this line. Great for running and for gym

mk1 short sleeve

Hi, the mk1 short sleeve is ausome but i'd like to see the waist a little snugger [tapered] love the mesh back , one of the best short sleeve shirts . I liked the raid shirts from a couple of years ago also and the cold gear reactor hybrid hoodie with the zip side pockets NOT the one with the snap buttons, that one was cut way too baggy in the waist and the snap buttons was a bad idea.

Great workout and everyday shirt

People keep comparing this to the Raid shirt which I think is appropriate. They have several similar characteristics. Overall, the Raid is my favorite but I only have 2 of them as the color choice went away. Both gray and dark gray I have. I have about 10 of these MK1 shirts and they are fantastic. The vented back is nice plus I like the design over the shoulders and down the sides. I've had several small holes appear on the chest of one of them right after a workout, which I've only had for a couple months. Overall, I love this shirt.

Good for but too long

It was a great fit for my body in a small size and I’m 5’8” the only thing that is not good is the shirt too long. Not everyone is 6’2”. ;) If they choose small size that means they might not tall as well.

Men’s UA MK-1 sort sleeve

The fit is smaller than the ones I normally bought. Overall, it is comfortable, and nice looking.

Hey idiots

what is the FIT of this shirt ? Loose or Fitted ? you stupids