| abstract |
A protective helmet can include an outer shell and a multi-layer liner disposed within the outer shell and sized for receiving a wearer's head. The multi-layer liner can include and inner-layer, a middle-layer, and an outer-layer. The inner-layer can include an inner surface oriented towards an inner area of a helmet for receiving a wearer's head. The inner-layer can comprise a mid-energy management material with a density in a range of 40-70 g/L. The middle-layer can be disposed adjacent an outer surface of the inner-layer, wherein the middle-layer comprises a low-energy management material with a density in a range of 10-20 g/L. The outer-layer can be disposed adjacent an outer surface of the middle-layer, the outer-layer comprising an outer surface oriented towards the outer shell, wherein the outer-layer comprises a high-energy management material with a density in a range of 20-50 grams g/L. |