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Concussion is caused by the brain bashing against the skull - 5mm of sponge doesn't reduce the force, at most it'll slightly spread it out. Your skull is still gonna move from the collision, it just won't be concentrated into one point.Curious as to why not. After all, its head protection, covers the side of the head (the more delicate part) and the forehead. Which implies some padding to reduce the force of impact, even if it doesnt cover everything.
They're for stopping cuts/cauliflower ears/protecting stitches etc.
https://scholar.google.com/scholar_...l=Med+Sci+Sports+Exerc&volume=41&pages=306-13
American Footballers still get concussions and they're wearing serious head protection.