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.

Great product to train

These new MK1 shirts are literally the best shirts to train in. Comfortable fit with optimal performance features like the vented back make this shirt a must for your training collection. I only buy the MK1 shirts now as nothing seems compare. [This review was collected as part of a promotion.]

Very effective moisture wicking

Great product. Fits well, and is really effective at wicking sweat away and keeping you comfortable. Also, it doesn’t smell bad as you sweat and dries quickly when washed. The only thing I would change would be to add about 4 cm to the sleeve length (but that is only because in prefer a slightly longer short sleeve). Recommended.

Comfort and quality

Great quality and perfect fit. Very comfortable clothing. [This review was collected as part of a promotion.]


Fits great! Functions good in the gym! Breathable which is nice. [This review was collected as part of a promotion.]

Comfortable , good fit ,

Material good for daily wear , good for warm weather and workout wear . Laindera well , and maintains fit . [This review was collected as part of a promotion.]

Us mk1

Have used this for tennis now past 3 weeks great in hot weather. Doesn’t stick to you.

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.

mk1 shirt

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