NRS Anarchy Helmet A BOA dial retention system snugs the helmet to your head to prevent shifting in turbulent water ConeHead technology spreads impact energy across a larger area, resulting in a lower, safer g-force than with other helmet liner systems The ConeHead liner consists of two layers of foam, a higher density outer layer and a lower density inner layer Cone-shaped projections mesh the layers together As an impact compresses the layers, the cones spread the energy sideways, dissipating the g-forces