Edit: In response to Vixtor
True, I understand where anyone is coming from, but don't you think the cork helmet has been tested and meets a certain safety spec/standard ? Why would it be on the market if it were unsafe ?
but you also have to make sure that any "alternatives" are actually a good choice.
implies that the cork helmet isn't a viable option. Google it and all this speculation about where it sits in the grand scheme of materials for protection is irrelevant. I did and one source indicates that although it doesn't absorb as much as the foam, cork does absorb the impact. What I found interesting and confirmed in the link, even have read it in other threads, the foam helmet lasts a single impact, haven't seen anything on how many impacts cork survives. But if it protects sufficiently, and is reusable, that's an advantage.
http://clackhi.nclack.k12.or.us/phys...b/Mainpage.htm