Abstract: A helmet comprises a protective shell, a first energy absorbing layer, a second energy absorbing layer and multiple displace devices. The protective shell forms an outer surface of the helmet. The first energy absorbing layer has a first outer surface and a first inner surface. The first inner surface is configured to couple the helmet to a wearer's head. The second energy absorbing layer has a second outer surface and a second inner surface. The second inner surface faces the first outer surface. The multiple displacement devices are positioned at multiple locations between the first energy absorbing layer and the second energy absorbing layer. The displacement devices allow displacement between the first and second energy absorbing layers in response to an oblique impact to the helmet.