Men's UA Threadborne Siro Tank

Style # 1289616
Height: Size: Fit: Loose
Mens UA Threadborne Siro Tank
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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 Tank

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
  • Thread-borne 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

Review Summary

22 Reviews


Min. Max.


Min. Max.

Light and comfortable

High quality very comfortable and light and breathable material

Good fit.

I own a few of these tanks and they are perfect. I usually run or paddle board in them and they wash well, holding their shape & color through multiple washes.

Nice one - fits perfectly

Nice one - fits perfectly. Maybe price is a little bit higher for what you get

Simple, yet effective design

I wear this to the gym quite regularly and is extremely comfortable with a good range of motion in the movements I perform.

comfortable and light, not hot

a comfortable and light singlet to run in... nothing fancy but just as good as many of the expensive brands....

Mesh version was great, too bad discontinued, no more colors.

This shirt came in a mesh version that has since been relegated to outlet. It only came in three colors--a bright orange, neon blue and great dark green. Wish they had given it more colors. The arm holes and neck holes are perfect size and position (way better than UA style) and the mesh is great for hot climate workouts, much cooler and better breathing than the other Threadborne Siro fabrics. If they made in navy, black, grey, etc., I'd purchase a bunch more. Instead, looks like they discontinued, which is disappointing.

Finally Found a UA Tank Top

I have tried many and always wondered why UA produces tank top with overly large neck holes and arm holes but tight everywhere else. Maybe they haven't catered to me because I am not build like a runner but with that said the Threadborne Siro is the closet thing I found to a normal workout or wear around the house tank top. I normally wear 2XL and needed 3XL for true comfort but the arm hole and neck hole are not too big considering the top is the 3XL. Some other UA tanks dangle on the arm hole to a point they show my obliques but this one is perfect. I will be purchasing every color. With that said, I normally am a 2XL so you may want to size up for ultimate comfort if you do not like a snug top and most people in my option who wear 2XL or 3XL do not want snug tops.

i love this singlet

it is very light and comfortable, does not cause any chafing.

Great shirt but a bit baggy

The Threadborne fabric is extremely comfortable, the design looks great and I love the color (light blue). It is good to notice that the shirt size is pretty big. I am 6'1", 198lbs (in good shape) and I use a medium size. What I like less about this particular shirt is that the neck falls deep into the chest (unlike the model picture).

very loose

Will have to return and try smaller size it's very loose [This review was collected as part of a promotion.]