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I am an amateur bike racer, and I have many jerseys from many manufacturers. Compared with other racing jerseys that I have, this one runs large. So, it is more of a touring jersey that has room in the arms, stomach, and hips, which is fine. If you want a sleeker, tighter, less wind resistant fit, I would size down. If you want a relaxed and more comfortable fit, it is true to size. Otherwise, it is a really great, well made jersey.