I'm 5'10, 165+ lbs, muscular. I ordered small due to my size and prefer a slim fitting shirt. This polo was tight in the chest and shoulders, but the arms were large and long (to the elbow). The shirt was too long to wear loosely. Perhaps due to my broader shoulders and narrow waist, this fit was not designed for someone with an athletic build. But I sent it back to get my money back. I think that unfortunately all sports polos have the same fit.
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