Correct, but these helmets pre-fix did not pass the NOCSAE standard, which is designed to prevent skull fractures. Certainly seems possible these helmets did less to prevent a concussion, than a certified helmet would have, if a player was hit on the top of the head where NOCSAE is now making Cascade add more foam to pass the certification standards.
The mechanism of injury for a skull fracture and a concussion are very different. It is possible to have one without the other in either case. Helmets are designed to prevent skull fractures, not concussions.
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