Steelers' Shazier warms up shirtless in subfreezing temperatures

The Miami Dolphins and Pittsburgh Steelers players were wrapped up for pregame warmups Sunday as temperatures hit lows of 16 degrees in Pittsburgh.

There was one notable exception, however: Steelers linebacker Ryan Shazier.

It was apparently cold enough that Shazier needed to wear a mask, but not so cold that he thought a shirt was necessary.