The shirt is excellent to run in
932796
As someone who is 6'0'' and 165 lbs, the medium fits me perfectly. The shirt is excellent to run in, hike in, lift, or wear casually. Super comfy. Highly recommended.
3020482
I got this shirt for my pops. He wears it when he goes racing, you know for luck :P
443171
This is very lightweight shirt. Great for running in hot weather. The black (or is it very dark blue?) mesh fabric on the back really helps to cool you down when it gets damp with sweat. The lightweight fabric seems less snag-prone than some other ultra-light shirts that I own. Construction is very nice with all flat-knit or taped seams inside. Reflective trim on the arms and back help car drivers see you at night. Like most New Balance shirts, this one runs very large. I weigh 160 pounds and size medium is very loose on me. I should try a size small instead. Just my preference, but I think the 2-tone look (red front and blue back) is kind of ugly. I prefer low-key single-color shirts, but maybe in a race some people want to stand out.
3499765
One of the best things about this shirt is that it is so lightweight and perfect for running in the heat. This is the second one of these that I've purchased and it continues to be my go to running shirts throughout the summer. BONUS: Also a great shirt to wear on the beach, if you happen to find yourself sunning it up this summer.
4160344
My new favorite running shirt. A little thicker than I thought it would be which is perfect going into fall and winter. Not so great for summer runs.
2928392
Can't beat this shirt.  I have several of this.  Also, I have a couple of the large sleeve.  They keep me cool in summer while running and in the winter, I put the short sleeve over the large sleeve to keep me warm in cooler weather.  I hate to give them such a good review because more people with purchase them and Amazon will raise the price.
935496
It's a comfortable shirt, and the fabric is a good weight for running outdoors in cool fall weather. The material feels nice and doesn't chafe, and  I like the thumb holes in the cuffs. The fit is a little odd as the bottom edge is cinched in a bit, so to speak, but it works for me. For $20 I think it's worth it, for sure.
1591077
The perfect dri-fit moisture wicking material causes this shirt to be ideal for running. I use it for lifting weights as well and it is ideal for that as well. Light, absorbs sweat without making the shirt feel weighed down.
2423869
This shirt was not too tight. Great fit. The pocket on the side fits an I Phone perfectly. Great running shirt overall.
4915737
I have several shirts with a similar fit and this is the best shape and detail. I wear it for running and have washed it several times and it hasn't faded and the threads at the seams are Intact. I'm 5'6" 115 lbs and the small is slightly large. I will buy again, but try an extra small.
3636289
first of all...THUMBHOLES! i love the color of this tech shirt. great for wearing out on a run when you need to be highly visible. the material is perfect for hot weather as well and wicks away the sweat just fine. perfect to shade your arms during a hot sunny day run. protects your arms on the trails from any scratches from trees and brush. long enough to cover my butt. that's important i suppose to some people. even though this is a men's shirt and i'm a woman, it fits just fine.
2982112
I really like this shirt a lot. I force myself to only wear it once a week so as not to appear that it's my uniform. I run to work and carry my clothes in a backpack. This shirt does not wrinkle too bad and I can simply shake it out when I get to work.
1116006
The Mountain puts out excellent shirts, they fit like they are suppose to and the wear is excellent, of course I remember to turn shirts inside out when washing and drying.
683264
The  color and fit of the shirt is amazing. The sleeves are not too short. Great for running and workouts or just as a casual wear. Would highly recommend it and the quality is great too.
3013976
The shirt is nice and long in the body and sleeves, a real plus!
2332740
This is a great shirt for running. I got one and so did my husband. It is light but sturdy at the same time. It keeps the moisture off too which is nice. I really enjoy wearing this by itself of over another shirt. Its perfect for long or short runs. I will definitely be buying another.
2025705
Love these shirts for running, lifting weights or hanging around.