Player wearing a helmet

[JS 20]

Last night I was working in a Varsity Girls team camp. One of the players came out for the jump ball wearing a soft foam helmet. Looked kind of like a mountain climbing helmet. It had no hard plastic and had no chin strap or anything else to "permanently" affix it to her head. We told the coach we'd let it go but she had better work on getting an exemption from the state if she was wearing that in the regular season. Is there a rule against the helmet or anything specifically covering it in the book? I know there's something about religious head dress but I don't remember helmets being covered. Thanks!!

It looks like this but w/ no strap

http://www.alimed.com/resources/comm...mb/31732_t.jpg