France
I can't say I know the letter of the law but I've not seen one of these for sale ever, not even one marked for off-road use. That said I have seen them on people's heads but only at a bike rally in a field, and the self-same heads were later seen sporting proper full-face helmets on the ride-out.
So I'd go with 3-wheeledbonnie, the gendarmes will tell you to get off your bike and won't let you back on it till you've got a helmet they like. Given that they quite like stopping people on a Sunday and that the bike shop might not be open till Tuesday, and won't be open at lunch-time, it's not worth the risk.
There's plenty of well-ventilated open-face helmets over here, and they won't cost you an arm and a leg, so why not have a look around.
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Happiness has 125 cc
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