Cool, now put those running mitts on please. I was trying to come up with a reason to the question you asked. And I couldn't come up with one. The best I could do is that players either think they don't look cool or that it makes them uncomfortable because they aren't used to them. Either one is a lame reason. So, yes, put them on. Pitchers don't want to protect their brains because the Great Gazoo hat looks dumb.