Plenty of room. Very comfortable and has a great feel. VERY breathable. If a shirt can feel "fun" without looking sloppy, this is it.
This is an absolutely cool shirt -- not just in looks, but it is in fact, quite cool temperature-wise.
I'd love to get more, please add a dark grey/black, an orange/rust and a deeper green, blue and red color. The color scheme on these is very mild, I'd prefer them with darker colors and would buy them if there were better/bolder colors available.