Boys' UA MK-1 Short Sleeve Shirt

Style # 1345660
Height: Size: Fit: Loose
Boys UA MK-1 Short Sleeve Shirt
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Size and Fit Guide
Due to limited quantities, only 100 allowed per customer.
The product can't be added to the bag
Height: Size: Fit: Loose
Boys' UA MK-1 Short Sleeve Shirt

Product DNA

Go-to gym shirts built with fabric that dries fast to keep you cool, while the streamlined fit cuts out bulk. It's also part of the UA MK-1 system—gear that all works together to keeps you ready for any training situation.
  • Loose: Fuller cut for complete comfort
  • 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
  • Style #: 1345660
  • 90% Polyester/10% Elastane
  • Imported

Review Summary

3 Reviews
100% of reviewers recommend


Runs small Runs large


Min. Max.


Min. Max.

Great fit. Great look. Love it.

This shirt is great for our son's activities. He's had sports camps in very hot weather and it kept him dry and cool. The shirt fits well and looks great too. Looks and acts just as the adult-wear, which is realy appreciated.

Fantastic sports T-shirt

Lightweight t-shirt that keeps cool while playing.

Awesome Shirt

Awesome fit for my newphew. Good quality and feel. Should last a while for him. Sits well on his body and looks good.