I have two of these shirts. I got the first one a year ago and have worn it on cold days and found it terrific. It is my indoor shirt.
I keep the house at about 65 degrees in the winter and do get chilly at times. I put this shirt on and find it comfortable, warm, and actually fun to wear. I do not use it as an overshirt, but wear it as the shirt to put on after work and the weekend.

It is warm, comfortable, and looks great.

The medium fits great at 5'11 and 175 lbs.

The black is a great daily wear color. Doesn't show dirt and washes fine.