It's high performance gear for just hanging out, too..
A side note from Joe: My wife calls me the "human heater", and I find these shirts to be about the coolest thing going. If you haven't tried one, you're missing out!
Sizing Tip: The 4XTs are about 68" in the chest and 36"++ long down the back.
Click here to view pics of our color choices from Columbia Sportswear's site COLORS