Men's UA MK-1 Short Sleeve

Style # 1323415
Height: Size: Fit: Fitted
Size and Fit Guide
Due to limited quantities, only 1,000 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 incredibly 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
  • Imported

Review Summary

36 Reviews
72% of reviewers recommend


Runs small Runs large


Min. Max.


Min. Max.

True to Size

Ive worn this t shirt in the gym several times now and I have to say that its very comfortable gym shirt. Fit is slightly loose for my build around the midsection and a little tighter around the arms. I'm 86 Kg and 185 cm and purchased Large.

Amazing shirt!

This Shirt was amazing. I feel like an athletic rockstar when wearing this shirt.


Awesome fitting and style, usually i am a large, but for UA i take a Medium, the pictures colors are the same as the originals and yes i will recommend this product.

mk1 shirt

FAB Shirt- great fit and the green is an amazing colour

Great t shirt

Great fitting shirt. Very light and breathable and perfect for training in.


Conforme à la description. La matière est agréable. Bonne absorption de la transpiration!Je recommande.

The perfect fit

So this shirt to me is the perfect fit for the man with a (more or less) athletic body. A bit tighter around the chest and arms, but still breathable. Perfect for your everday fitness, run, or tactical purposes. I got the black and green color in M size and they’re great. Well done Under Armour!

Just what I was looking for

Perfect fit with a good length. Fitted on the arms and chest and loser going down so great mobility and flexibility. It also remains breathable after long workouts in high temps. I'm currently waiting on my 2nd one to arrive!

Nice and light

So I usually get a size down. So for the UA Tech shirts, I tend to get a small. This is quite tight fitting so I got a size up, so a medium and it fits me perfectly.

Super cool shirt met perfecte kleur groen

Pasvorm is perfect, de stof voelt comfortabel en het is dé kleur groen waar ik al een tijdje naar op zoek was.