how is this even being discussed.
Helmet, like bumpers, are sacrificial packaging. They deform, that deformation requires energy, that energy comes from the impact. The sacrificial layer fails over a distance (part of its own thickness) that failure over a distance is also far better than an abrupt impact. A concussion is greatest when your brain rattles inside your skull.
Better to have the padding inside the helmet crushing, and your whole head sloshing inside it, BEFORE your brain sloshes across the fluid in your head into your skull.
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