New Arrival

Men's UA MK-1 Short Sleeve

Style # 1306428
Height: Size: Fit: Fitted
    • Color: White (100)
    • Please Select A Size
    • S
  • Availability: 
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: Fitted
Men's UA MK-1 Short Sleeve

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Product DNA

The UA MK-1—short for Mode Kit 1—is an entire system of light, sleek, breathable warm-ups and core training gear that layers together to give you every advantage for any workout. Speed, agility, strength, cardio, in the gym, on the turf…whatever you’re doing, just build your kit and get to work.
  • 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

50 Reviews
38% of reviewers recommend


Runs small Runs large


Min. Max.


Min. Max.

Exactly what I Need

Fits amazing and I work in the Texas heat and these shirts perform phenomenally. I hope UA never discontinues these shirts!


What the heck to you people use as size guidelines. One time a large T-shirt, same fit, etc is so big i could get 20 pounds before it fits. Next a ordering same shirt and you can breath it’s so tight. Get a guide and use it

Under Armour and Jemima from Rebel sports AWESOME

Well my best friend is an avid under armour customer and has always espoused your products shorts tees slip ons. I was shoe shopping at rebel sport at warringah mall got my shoes and on the way out saw a under armour section . Went had a look was greeted by Jemima and thoroughly looked after by her . I hate shopping for clothes and shoes for myself because i am a very large strange shape (always hard to get clothes that fit. But after trial error and much patience from Jemima i bought a pair of shirts and tee shirt. I wear shorts to work every day they are literally the most comfortable shorts i have ever worn and the tee shirt now is super comfy very happy with product and service

Bought 2 in Dubai ... just bought 3 more.

Favorite shirt, really. I like the white, but will probably get a few other colors as well. It feels really excellent against the skin, and very cool in the heat.

Rebel Rouse Hill Town Centre

Staff at Rouse Hill Town Centre Rebel have great Customer Service. They were helpful, friendly and were able to suggest an alternate product when the size I was looking for wasn't available in the T Shirt I was originally looking to purchase


Good fit in shoulders and chest, recommend a size up.

About time-love it

I am 6'1" 230lbs lift weights 7 days a week so my torso is very thick. UA sizing is weird , loose large fits ok but is to short, XL fitted, fits great but again short on me like a belly shirt. at 6'1" I have a 31" inseam so short legs long torso. IF UA ever carried more Fitted XLT like these I would definitely buy 7-8 more. Sadly very hard to find fitted XLT here

Everything’s Great Except Durability

I love everything about this shirt except the durability. Fabric feels like a comfortable t-shirt but performs is light and wicks sweat, fit is spot on, and the length is right. The fundamental problem though is the mesh part of the shirt (back half) is not durable. I bought a few of these and after only a few washes, the mesh part is already falling apart on each one. All UA needs to do is ditch the mesh and use the front fabric all around.

Under armour T-shirt

Nice light t shirt. Feels good on the skin. I would recommend buying one.

very good shirt

i like this shirt it is very good quality and light