I have used cheap and expensive ear guards, but always seem to be coming back to this particular ear guard.  I train BJJ and my son uses this for wrestling.  For BJJ the worries with ear guards would be that it makes it harder to get out of guillatine chokes and triangle submissions, but I would say that this would be lower profile compared to the majority of ear guards out there.  For my son, he seems to like the velcro adjustability that this could be done easily by himself even right before a match.  This is also affordable enough that if you loss it, for the price point, it can be replaced without worries.  My son seem to loss his ear guard every two months, so I own extra pairs of this particular ear guard as replacement.  I would highly recommend this product to anyone.