Men's UA MK-1 Short Sleeve

Style # 1306428
Height: Size: Fit: Fitted
Size and Fit Guide
Due to limited quantities, only 100 allowed per customer.
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Height: Size: Fit: Fitted
Men's UA MK-1 Short Sleeve

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Product DNA

These are the go-to gym shirts for nearly every guy. The fabric dries fast to keep you cool and the streamlined fit cuts out any bulk or unnecessary material.

It's also part of the UA MK-1 system—gear that all works together to give you what you need in any training situation.
  • Fitted: Next-to-skin without the squeeze
  • HeatGear® fabric is ultra-soft & smooth for extreme comfort with very little weight
  • Mesh back & underarm panels deliver strategic ventilation
  • 4-way stretch construction moves better in every direction
  • Material wicks sweat & dries really fast
  • Anti-odor technology prevents the growth of odor-causing microbes
  • 90% Polyester/10% Elastane
  • Imported

Review Summary

27 Reviews
30% of reviewers recommend


Runs small Runs large


Min. Max.


Min. Max.

Sizing Discrepancy

I bought this shirt originally in extra large and loved it. It worked so well that I lost 25lbs at the gym wearing it. Then went to order TWO of the shirts in large since I liked it so much. Then I get the Large and notice it has a wildly different fit. It isn't just tight, it is much shorter and has much shorter sleeves. Just weird to me that the sizing can be that much different. I still wear the extra large to this day even though I swim in it.


This shirt is great and absorbs sweat evenly 5/5.. did not shrink after wash and color is not fading which is Great

Great shirt

This shirt is great for the gym fits great I like it a lot overall nice shirt i’m very happy I ordered it it fits well


Mesh on the back and non-mesh at the front, good material

Great look Great comfort

I own several of these tees. They have a flattering shape and fit well for me in the XXL size. The body is longer than many other tees so I find excellent for tennis as they don't ride up when serving. Good range of colours and very comfortable for any activity.

One of my favs!

At first glance, this may appear a simple tee, but it is one of the best-fitting pieces of active gear I own. Its next-to-skin fit is ideal, especially for those who train, or those who are after a slimming fit. It works well at keeping me cooler and dryer during a workout, and is comfortable if wearing throughout the day. I can't own enough of these tees!

Love the length and fit! Always wear these shirts when I train.

Love the length and fit! Always wear these shirts when I train.

Love how this shirt fits

Best fitting shirt from UA, even better than Raid. Wish it came in brighter colours, like red or royal blue, but I like this so much I’ve bought one in each colour.


The length of the black shirt i got is too long. it doesn't look that long in the picture but it was almost 1.5" too long on me. Didn't notice much difference in performance from a regular heatgear shirt. Not worth the additional cost over the regular heatgear shirt.