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A2Difficulty 2/5

What is the function of the impact-absorbing inner layer, usually expanded polystyrene (EPS), beneath a helmet’s outer shell?

Correct answer

Absorb part of the impact energy by deforming.

It absorbs part of the impact energy by deforming and helps reduce the force transmitted to the head. This protective layer is different from removable textile padding intended for comfort and fit. Deformation may remain hidden: after an accident involving an impact to the helmet, replace it according to manufacturer instructions even if external damage is not visible.

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  • Act as a sun visor to shield the eyes from light.

  • Absorb part of the impact energy by deforming.

  • Prevent every injury regardless of impact severity.

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