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Doesn't matter if it's legal or not. After two deadly head injuries in the family within the last 6 months, I'm think there is no excuse for not protecting your head. Just my 2 cents
Here is a link to a Canadian supplier that carries a lot of snowmobile and atv helmets and accessories. I have bought some items from them and visited their Guelph store once. Pretty nice stuff. You can find all kinds of kids stuff there - www.royaldistributing. com