What is wrong with all the various standards? Are they just not rigorous enough? Or is there some other problem?
Here's a quick list of different information I found http://www.bhsi.org/index.htm#standards
Here's a quick list of different information I found http://www.bhsi.org/index.htm#standards
Stop broken skulls, great. But concussions are still very possible, and current helmets do not do much for it.
EDIT: There are a lot of very smart people working on this problem. But it's a hard problem.
From the Associated Press:
In a series of interviews with The Associated Press, representatives of the NFL, its players' union and the four equipment companies that make every helmet worn in the league all agreed there's no football helmet -- in production or on drawing boards -- that can eliminate concussions. And there might never be one.