The shirt was purchased for the moisture wicking concept.  Its a little bit heavier material than I anticipated so its not T shirt quality, its better.  Its not too thick either, its really just a nice work shirt or shirt that you plan on doing some exercise or physical activity in that you want to help keep you dry.  So far it has been great with doing just that, usually my armpits are wet and stain my shirts when I am working, but this has even held up to my issue with that.  I would purchase your normal size, Dickies is always a good quality product.