It's NOT made in the USA!!!
I bought this shirt as a gift for my husband who prefers made in the US products. The product description said it was made in the US. When it arrived, it had a detachable tag that says made in the US. But sewn on the shirt itself is a tag that says Made In China!!! The topmost button (by the collar) came off when I touched it. I did not even take the shirt out of the packaging! If you're looking for made in the US shirt -- this is not the one. Love buying from REI, but not this time around. Returning the shirt took several days and many follow-up emails and calls.