This super silky poly/cotton fabric is lightweight yet durable. When you play the Game of Thrones with a shirt this comfortable, you either win ... or have a sick training (or lounging) session anyway. And if you show up in the North with it, I'm sure they welcome you warmly (coldly?) or something that's akin to friendly up there. Just don't venture north of the wall - the lightweight, breathable fabric isn't very warm.