I love these shirts so much I'm about to order another set. I'm 5'10" and 175 pounds. I ordered them in a medium size but I think I could do with a small size. I love how comfortable these shirts are and they are very stretchy. I wore them as underwear under my work shirts. But they are also perfect as a training shirt or even as a shirt. But I like them, apart from being elastic they have a collar. The collar fits well and snugly around my neck. They don't hang around the neck and are perfect as a tank top. So I actually get three shirts for the price of one because I can wear them as a shirt in public and wear them as a tank top when I work out. I would highly recommend these and I love them.
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