Men's UA Threadborne Siro V-Neck T-Shirt

Style # 1289587
Height: Size: Fit: Loose
Mens UA Threadborne Siro V-Neck T-Shirt
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Size and Fit Guide
Due to limited quantities, only 100 allowed per customer.
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Height: Size: Fit: Loose
Men's UA Threadborne Siro V-Neck T-Shirt

Product DNA

  • 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
  • Polyester
  • Imported


This is what makes our gear work harder—and smarter—than anything else out there.


The original innovation our founder dreamed up. This super-breathable fabric wicks sweat and regulates body temperature so you feel cooler, drier, and lighter than ever.

Review Summary

24 Reviews


Runs small Runs large


Min. Max.


Min. Max.

poor presentation when brought online

When i order this on-line,the good I received had really poor quality, looks like this had been worn for sometines

Solid shirt at reasonable price

Im 5'9 asian so a bit of a smaller build (~70kg/155pounds), wear a small for most shirts. Fit pretty much perfect around the shoulders, perfect length, and theres a bit of room around the waist with the looser fit ie: so its not skin tight and your gut doesnt bulge out if you're like me and have a few kgs/love handles to lose!!! Quality seems about right for the price ($15 AUD black friday sale, but even at $25 i'd be fine with it), material is a touch thinner than other UA shirts i have but then again its pretty much half the price. It doesnt feel like its going to tear or fall apart, its fine and serviceable. This is my view - note: i dont get reviewers who sound like their expectation is of a $50 or $100 product when theyve spent half or a quarter that price ...

Great quality & excellent service

I brought this shirt recently & I am very happy with it. Great quality & cool to wear

This is NOT a workout shirt

I bought this, since it advertised it as a gym shirt. It isn't. As a tshirt, it's quite comfortable, but working out, it's horrible - it sticks to me, doesn't wick sweat, is extremely uncomfortable. Don't recommend.


Bought two of the same (as I left my first one at home) and went to pick up another one for the run.. Found out the hard way. ..If its built in INDONESIA, its great quality and thick material but if its built in HAITI, then the material is very very thin, so check the manufacturing country first..


Ran small...a 3x was like an oversized 1x from past experience with under armor. See through material...very thin...I understand is breathable but that is just a fancy word for cheap fabric in my opinion!

Comfortable. Good fit and keeps my cool on MTB rides.

Great shirt for cruisy MTB rides along the beachfront bike paths. Lightweight. Good fit. Love the colour.

Threadbone V Neck T shirts

Bought 2 of these tshirts and they are very comfortable to wear. They were on sale but wisb they could have been cheaper.Compared to US pricing, it is more expensive over here in OZ.

My favorite, by far

I am a huge fan of these shirts. They are incredibly comfortable, even more so than the Tech shirts, which says a lot as Tech shirts are great. These are simply a cut above. I wear these to workout, casually...frankly whenever I can. As a 6'6" guy, these fit me great in the Tall size. My only complaint: provide more color options in Tall sizes, as well as other styles aside from the Siro in Tall (such as V-Neck).


My first Threadborne product, it does have that soft feeling, even though it's not cotton. The sizing is always weird, and it is a little big, but I suspect it will turn out fine. Got it for a good deal and am satisfied. Thanks UA!