The present invention provides a protective headgear having a multi-layered configuration to attenuate amplitude of shock waves to a human head by inducing a first destructive interference of incident shock waves through phase reversal at a boundary between two adjacent layers of an outer shell, and a second destructive interference of transmitted shock waves across an inner layer in a cut-pile configuration. Shock waves is attenuated further by reflectively diffusing the transmitted shock waves at the boundary between the two adjacent layers of the outer shell, by reducing focused constructive interference between two symmetrically opposite transmitted shock waves coming centripetally off through the outer shell of the protective headgear, and by limiting seepage of the shock waves into an inner space between the protective headgear and the human head through filtrative trapping of the shock waves across the inner liner in the cut-pile configuration.
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