It's really comfortable, but not too comfortable, unlike sweatpants. Someone once told me, "If you're going to put sweatpants on, you better go on a run. If you do anything besides that right after you put them on, you might as well get in bed. You're not going to do anything the rest of the day. Your day is done when you put sweatpants on."

That's actually a lengthy elaboration of what she said, but no matter. You get the gist.