I bought MT and LT as I usually wear medium tall in t-shirts (I don't like tight ones but I don't want baggy ones at all) I think Amazon has one size problem. I only tried on the LT and it was tight. I could return both for the XLT, but Amazon shirts from the brand they use tend to shrink and this shirt, while soft, was very thin and didn't feel like it would hold up at all. Fair enough, the detailing around the neck and sleeves is very good.
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