Men's UA Threadborne Siro T-Shirt

Style # 1289583
Height: Size: Fit: Loose
Mens UA Threadborne Siro T-Shirt
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Height: Size: Fit: Loose
Men's UA Threadborne Siro T-Shirt

Product DNA

If you're only looking for one shirt, this is it: the stealth ventilation keeps you cool and the Threadborne fabric is super-comfortable. But really, it's the attention to detail that makes it the first thing you grab even when you're not working out.
  • Loose: Fuller cut for complete comfort
  • Threadborne Siro fabric gives greater stretch & recovery, ultra-soft feel & more breathable performance
  • Material wicks sweat & dries really fast
  • Anti-odor technology prevents the growth of odor-causing microbes
  • 100% Polyester
  • Style #: 1289583
  • Imported

Review Summary

100 Reviews


Runs small Runs large


Min. Max.


Min. Max.

Review of the Threadbone Siro T-Shirt

I purchased this shirt to go on a quick Trip, it fit well and was very comfortable. In fact I now use it as one of my go to shirts for exercising. It has a very good fit and a comfort that I do not find in all of my T-Shirts.

Threadborne is Threadbear

The Threadborne material is so thin it is see through.

Its good

The shirt is really good and fabric is soft but the seam around the shoulder can be much better.

Not Happy with fabric

I was not happy with the fabric of this shirt. I found the fabric very thin (almost see through) and just after 1 wash it pilled quite severely! I love Under Armour and usually quite happy with my purchases, but not with this shirt.


Warna yang dibeli adalah putih, bahan tipis, sehingga terlalu trasnparan saat digunakan

Great Quality Shirt

While UA Tech shirts have lost their touch that made them excellent years ago...Siro picked it up. These Threadborne shirts are actually solid with respect to the material, comfort level, performance, and appearance. The shirt does run a little too big but either way it's an excellent choice.

Good shirt minus pilling

Love UA shirts and have a few of the threadborne shirts, but they can be hit or miss. My newest threadborne siro shirt pills quite a lot, even though I only wash it with other UA /non-cotton workout clothing. My other UA shirts (some older, some newer) never pill, and I always wash all of them together. Seems like there is no rhyme or reason why this one does and my others don’t other than luck of the draw I guess. Overall a good shirt but you may wind up with one that decides to pill constantly.

Very comfortable fabric, but not as durable as Charged Cotton

Great t-shirt fabric for workouts and hot weather, and is super comfortable. It is thinner and not as durable as the Charged Cotton (sportstyle) which seems to have the best comfort, feel, and durability combination. The Smash Yellow (#772) is more like a mix of yellow and slime neon green color, not a true yellow. It is also a bit see through, compared to the other colors of the same material.

Comfortable and fashionable

My second shirt from UA and just as comfortable as advertised. I went with a coral colour and it is fantastic. Only issue is piling but I don't wash it separately or delicately, so can't complain too much.

Best T I’ve ever bought

I naught one thinking it was just going to be an at home wear piece, but it fits loose and was so comfortable, I will definitely be buying more of these.