I really LOVE these shirts and have in about 4 colors but for some reason I accidentally ordered on in XL instead of Medium! So it's still in the packaging and I don't know why I missed returning it but now someone can have a good deal on a new shirt. The tag is Asian XXXL but US XL. I can vouch for the correctness of the US Sizes. It's definitely a show-off-your-workouts kind of shirt with lots of stretch, but it's very comfortable 95% cotton and 5% spandex fabric. Bundle up to save on shipping.