When you click on the size chart link in the description, the sizing chart that pops up for this item is actually for Women's clothing, not Juniors.  If you follow the chart Amazon provides, your shirts will be way too small!  I am 5'6" and 120 pounds, I normally wear a Small in Women's clothing, so I ordered a Medium and although it fit well I kind of wish I would have ordered a Large because they are a little snugger than I would have liked for a work shirt.  The quality is very good though, and I like that they are longer and fitted rather than short and boxy like so many other polos.  I liked them so much I'm ordering more!