Is it the icewater in their veins?

I'm watching the Twins-White Sox game on TV and noticing everybody looks cold. I'm seeing on weather.com it's 53 degrees in Chicago right now, not exactly freezing. So it's dawning on me guys in postseason baseball tend to look cold whether or not it's actually cold. Maybe it's something about the way people carry themselves under pressure. Maybe this is the way to pick the winner, look for the guys who don't look cold.