I am 155 lb with an athletic build and I got the small. It fit just right around my waist and shoulders. The fabric is soft and a little stretchy (which I like). Fair warning the collar does not actually unbutton. The shipping was faster than predicted, it arrived two weeks before the estimated delivery date. I ordered one that was a medium (too big for me) and Aiyino was quick to respond and gave me a partial refund (the shipping would have been too much for it to be cost effective to send the shirt back). Overall I am very satisfied. Great product and great service.
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