An afro is like having long hair in boxing; counter productive. I mean think about it, if you've been drenched in water by your corner in between rounds and then go back out and get nailed on the face and head, you're hair is going to shake with the reverberations, making the impact look bigger and more effective than it was and thus easier to score and could work against you. It sounds wierd I know but there is a degree of logical to this line of thinking.