I am absolutely in love with prAna tees. The burnout fabric keeps you cool (and dry) when working out, and warm when you're at rest. They are also cut in a way as to be very flattering. I take my normal size, large, generally (I have the Leah, Vine, and Fleur) and ordered the Chai in a large as well. It's a bit too narrow in the shoulders but fits elsewhere. The Spiral Tee has the same cut and I got it in XL and it's a much better fit. So I would recommend sizing up when purchasing this crewneck style.