Comfortable is best -- especially in the heat, which I loathe and don't tolerate well. When I was in the Mojave, the one restaurant in our community (that I know of) had an anniversary and they passed out T-shirts to all of the customers! They were all XXL so everyone could wear them, I guess. Anyway, I'll never give up that T-shirt as there are so many memories of going there, and it makes a great sleep shirt.It's a cross country (running) t-shirt from high school. Was too big for me back then and still too big for me. But it's light-weight and not binding. Perfect for June 11 weather (or June 12 weather when you see tomorrow's shot. )