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

Style # 1289587
$25.00 AUD $40.00 AUD
Height: Size: Fit: Loose
    • Color: Black (001)
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  • Availability: 
Size and Fit Guide
Due to limited quantities, only 10 allowed per customer.
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Height: Size: Fit: Loose
Men's UA Threadborne Siro V-Neck T-Shirt

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Product DNA

Using new manufacturing techniques, Threadborne Siro fabric is built to eliminate distraction. We‘ve engineered it to keep the ideal distance between fabric and athlete, so it won't cling when wet and dries incredibly fast.
  • 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
  • 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

21 Reviews


Runs small Runs large


Min. Max.


Min. Max.

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!

Runs very small

The shirt feels great but it runs at least a size small compared to other UA loose fit shirts. On top of this, if you’re tall, don’t bother, made for people under 6 foot / those with a very short torso. I’d advise getting a size larger than normal and would be nice if UA offered in a tall.

Soft threadborne. Favorite v neck

I never thought the tech tee would be outdone but UA did it with the threadborne. Fits freely, super soft. Goes great with shorts , sweats and even jeans.

Great V-neck, different than tech v-neck!

This is my first v-neck thats not the tech v-neck. Love the tech v-necks as workout shirts and casual tee in the warm Atlanta climate. This threadborne is a bit different. Sleeves are a bit longer and material is more soft and comfy but not as light. Great overall tee but I still think the tech v-neck is the best tee ever made.