These are very comfortable shirts. I could probably go for L instead of XL just for a tighter fit. I think it depends on what you're up to. I'm 6'3" and 225 lbs. I bought size XL. They fit well but since I wear them under other shirts I wish they were a bit tighter. If you just want to wear a regular white shirt , probably order your normal size. Also, after wearing it for a while, the neck will become "loose". Nothing special, but worth mentioning. I bought a second order after wearing the first one.
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