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

Style # 1289587
$40.00 AUD
Height: Size: Fit: Loose
Size and Fit Guide
Due to limited quantities, only 10 allowed per customer.
The product can't be added to the bag
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
  • 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

13 Reviews


Runs small Runs large


Min. Max.


Min. Max.

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.

Most comfortable UA shirt I own

I buy a lot of UA gear, some would say I have issues but this shirt is the most comfortable shirt I have gotten. Wear it more as a casual shirt vs. working out in it. Usually sleeves bother me in hot weather, with this shirt didn't even notice the heat. Had to buy another one!

Great for workout

It's very light, the neck opening is a bit too small for me, but overall comfortable. [This review was collected as part of a promotion.]


The shirt runs on the small side The v-neck is too small of a hole Very disappointed in the product Hereafter I will stay with the outlet center where I can see product

Nice shirt. Conquer quality control.

I'm in love with the brand. I love the feel of the material and cut of this shirt style. I especially love the tight v in the v-neck of this style because it doesn't show too much skin. This shirt isn't very good at wicking sweat. I bought two shirts one in light blue and one in red. For a medium, both are shorter than other traditional mediums from the brand. This shirt is shorter than I like but adequate to tuck into my pants. Both had quality control issues on the right shoulder. The blue one had a hole in the right shoulder that I didn't notice until I got into the workout. It started as a thread piling or dimple. After 10 minutes into a workout, a hole appeared. Not sure if it was weak in that spot or if the fabric is frail. The red one had a black stain on the right shoulder and it was almost in the same place. When I examined it..the stain penetrated the fabric and there was no point trying to remove it. This is not a usual issue I have observed from other under armor products. So far only in this style of threadbone. I plan to return these shirts. It may be a problem with the store or shipping this product. I am not going to purchase any more shirts in this style.