Great shirt. Not insulated so a shirt is not a jacket. I would say if you want your clothes to be looser fit go down the size you think you need and if you like a tighter fit go one size down. In my experience they are a little big for their size as I received a large one and it definitely doesn't fit. I'm 6'0", 190 lbs, athletic/muscular build. Update 11/06/17: Two buttons came off in the washing machine, I had to sew them on. Not looking forward to reinforcing or sewing on the remaining buttons, as I'm sure skill will show in the remaining knobs.
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