Because I once won some tournament on Heroes of Might and Magic Online, and they gave me a Heroes Portal t-shirt as a prize, and the entire front was covered with a design. But the design was glued on, and it made me sweat underneath it. I can't wear that kind of t-shirt, even though I don't sweat much.
My wife wears that t-shirt now. :)
I like the t-shirts I've seen in America:
Mountain brand. You can order them here too. Super quality, I haven't seen anything like it. I recommend them to everyone.