I'm 6'1", 215 lbs, athletic build, 46" chest, 36" waist. I ordered XL. I didn't swim in it but it was too loose. I could stick a few fingers in the sleeve's sleeve. I'm sending it back and buying TWO more, I think the size that will fit me is large. The shirt looks really cool and the orange color I have is perfect for being visible while cycling. I hope my measurements will help you determine what size YOU need.
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