It basically acts like a crumple zone in a car.
An EPS helmet has a crumple zone of about 2mm while the Kranium liner crumples slowly all the way ( 8 to 15mm)
The rate at which the liner crumples stops the sudden impact to the brain which causes concussion by increasing the crumpling time. I hope that clears the doubt.
It is better at stopping concussions than Polystyrene.
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