Which innovative helmet design feature was specifically introduced during World War I to reduce the number of fatal head injuries?

Throughout history, military helmet design has evolved dramatically to meet changing battlefield needs. From ancient bronze helmets to modern advanced composites, these protective gear innovations reflect both technological advancement and tactical priorities. This poll explores an interesting fact about how product design evolution in military helmets affected soldiers in one of history's most significant conflicts.

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The Brodie helmet's wide brim, designed to protect soldiers from shrapnel falling from above in trench warfare
Camouflage patterns painted on helmets to make soldiers less visible to enemy snipers
Chin straps with quick-release mechanisms to prevent strangulation during hand-to-hand combat
Ventilation holes arranged in specific patterns to reduce heat exhaustion while maintaining structural integrity