I'm not surprised, even among thin people almost none of the folks you see wearing Under Armour around are fresh from a run, or about to do some exercise. They want to send a message to their peers that they're "healthy", "active", and "sporty". Don't get me wrong, I love my underarmor leggings underneath my ski outerwear, the difference in mobility is huge, I just can't stand those people who go around wearing it to do errands or go to class.