The New York Times recently published an article outlining the debate on whether girls' lacrosse should have helmets required. It goes over Florida's recent requirement that all female athletes playing lacrosse to wear protective headgear.
The prevailing concern is that if girls wear headgear it will cause them to play rougher with the end result of more injuries. This article does a nice job of explaining how that train of thought is being slowly replaced by the reality of how important protecting from head injuries is, and observing no discernible change in play styles.
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