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<i>Though we see the shell and think of it as the main barrier between our heads and the hard world, it is the EPS (hard expanded polystyrene foam, like styrofoam) liner that actually absorbs most of the force of impact. The shell prevents penetration and spreads the load.</i>
Motorcycle Helmet Quiz: Check Your Head-Protection IQ

 Though we see the shell and think of it as the main barrier between our heads and the hard world, it is the EPS (hard expanded polystyrene foam, like styrofoam) liner that actually absorbs most of the force of impact. The shell prevents penetration and spreads the load.  View Related Article

 

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