I am newly obsessed with these shirts. I am slowly buying all the colors I like. I am weird with materials in general, especially long sleeve shirts. I don't believe in winter because of how much I hate wearing long sleeves, however winter does exist where I live so it is usually a miserable experience for me in terms of never having comfortable shirts. And these bamboo shirts have exceeded my expectations. They are SO comfortable, I want to live in these shirts. They ship extremely fast as well. I think a small would be okay, but I am a little bigger in the chest and like a looser fit in general. Overall, I really like the quality, the fit, how comfortable they are, and I like the more earthy and darker colors but that is just my preference.