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The heat is rarely an acceptable reason to call off your run or game of flag football—especially when you could just slip on the Icebreaker GT Run Ace Shirt and keep your body temp in check with the power of merino wool. This sleeveless shirt utilizes the moisture-wicking, quick-drying, and odor-resisting powers of natural merino wool to enhance your body's built-in cooling system, which means it helps to evaporate your sweat as it forms to bring down your skin's temperature. Plus, the way the soft, lycra-infused fabric stretches over your skin provides a form fit that encourages you to run an extra lap around the park.

  • Merino wool fabric balances internal breathability and temperature regulation so you stay comfortable without overheating
  • Icebreaker GT technology blends merino wool with a Lycra framework to improve stretch, increase durability, and accelerate garment's dry time
  • Icebreaker makes its products in a way that supports New Zealand farmers, ensures overall welfare of the sheep, and promotes sustainable manufacturing practices

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Icebreaker GT Run Ace Shirt - Sleeveless - Men's

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Here's what others have to say...

5 5

Great for workouts

I own quite a bit of Icebreaker gear, (Don't tell my wife) and this is one of my favorite pieces. As other reviewers have noted, this piece is lightweight and doesn't take up a ton of room when traveling, while wicking better than cotton and not getting stinky after a single workout, like synthetic material. The fit is definitely tight, so if you prefer a loose workout shirt go larger than usual.
The only con I can think of is the durability. A little care is needed to keep it in tip top shape.

4 5

Great traveling gym shirt

  • Gender: Male
  • Familiarity: I've put it through the wringer

I use one of these when I travel as a gym shirt. 6'1" 190# and the large fits just right; not quite snug, but with zero excess hanging about. Rolled up it'll fit inside a gym shoe, so it takes up zero room. And after a hard sweaty workout, just rinse it in the sink, throw it over the towel bar, and it'll be dry and odor free by the next morning. After a coupe of months of that, it still retains its shape without stretching out into a shapeless sack, with no fabric pilling or color fade. This thing may be just about indestructible.

4 5

Great Running Tank.

Icebreaker got it right with this one. Nice little pocket for an iPod or an ID makes this shirt a great buy because you can just get up and go with nothing but the shirt on your back and the shoes on your feet. Not a must have, but a great addition to a running kit.

5 5

Perfect All Weather Sleeveless

You can wear this as a base layer for extra core warmth on those really "crisp" days or you can wear it alone on a hot day in the desert. I was more surprised by the latter than the former. I think most people would agree than any additional layers of Marino Wool will make you feel that much warmer, but it's not intuitively obvious that it works on hot days as well. It is not what I would wear in the desert with full Sun, but that’s only because it only comes in darker colors. If this were white or off-white, I would wear it in the hottest environment. That’s because it fill up with sweat in the heat and acts like a cooling blanket. Very nice! So I would limit this to the upper-80’s or mid-90’s on the high end, but it is incredibly comfortable in the 50’s, 60’s, 70’s, and low 80’s. That’s a nice range for a single shirt. Adjust to taste.

5 5

great shirt

This shirt is fantastic. I'm a huge fan of merino's performance, and going sleeveless is great for summer adventures. I've worn it on a couple 90 mile bike rides, a few days hiking, a couple runs, and casually a few times. I've yet to wash it, and after all that it still smells fresh and ready to go.

You don't really notice the performance difference between this and other shirts until you go back. It blows cotton out of the water, and while synthetics may wick, they don't feel anywhere near as good doing it.

The only downside to merino is that it's very fragile for how expensive it is. I've avoided wearing this shirt while doing anything that could damage it. For example, I've helped some friends move, and I would have love to wear this for the performance, but just couldn't risk it. I also would hesitate to wear this to the gym I go to (they have us do all kinds of crazy stuff)... although your average gym for lifting/cardio machines wouldn't pose much of a threat.

One last thing to note- merino in general seems to be designed to hug your body. I wanted a looser fit, so instead of the M or L I'd normally order, I went with XL. For what it's worth I'm 6'1" with a thin build. If you're normally on the fence between two sizes like I am with M/L and want to ensure a loser fit, go XL.

5 5

Simply amazing

This is my first piece of icebreaker clothing and merino wool and it is simply amazing. It has quickly become my favorite shirt to wear to the gym and around town running errands. The merino wool with a touch of lycra is soft and has just a slight cling in the chest to be semi-form fitting. I'm 6'7, 235 with a 46" chest and 34" waist and the xxl fits perfect. I will certainly be buying more merino wool and icebreaker clothing.