OK, this looks like something I would have made, except that I would have used duct tape for the shell 
Anyway, this is actually a reasonable use of cardboard, I think. All bike helmets should be discarded after a serious crash anyway. Cardboard can be very strong, yet crushable at the same time. The only problems I can see with a cardboard helmet would be with moisture- either rain or sweat. So I would think if you’re NOT prone to crashing, the foam helmet would last longer. (notice there are no vents in the plastic shell).
The benefits are touted as – lighter weight and that it actually is able to withstand THREE TIMES the impact energy of foam!
Let’s hear it for cardboard!
This would be perfect for riding the Cardboard Bicycle!
