While dragging the parents around the south island this week, I noticed a French Canadian guy folding up his bike helmet and putting it into his backpack. I remembered that ages ago Dahon had advertised their "Pango" so I said hello and had a look. Labelled "Biologic", it was indeed the Dahon folding helmet and very impressive it was too. If anyone's interested it's available from the Biologic site for about $130 and looked really sturdy. Great for commuting I'd imagine.