Cardboard Bike Helmet

Here is an interesting design for a helmet made of cardboard. It looks interesting. I know cardboard is stronger than it looks, at least end on. I do have questions about the durability though.  They did mention that it would have a plastic shell. Also the cardboard is treated to be water resistant. I don't know if the plastic shell covers the inside? Otherwise you might get mushy cardboard where it touches your sweaty head. Still I am always excited for new and cheaper helmet options.

-Dravis