The exterior of the Voronoi is made of carbon fiber. Carbon fiber is a high-tech material. Thanks to the layered structure of interwoven fibers, the outer shell of carbon fiber offers exceptional impact resistance while being incredibly light (weight of the Voronoi helmet with low temporary protection: +/-650gr). The outer shell of the Voronoi perfectly combines lightness and strength for better protection of the skull and temple.

The inner shell of the Voronoi is made of EPS, one of the most absorbent on the market. A rib reinforces the structure and provides above-average crush resistance. Freejump took inspiration from bicycle and ski helmet technology by integrating a polycarbonate plate directly on top of the EPS. This in-molding technology of EPS with polycarbonate, combined with the carbon fiber outer shell, provides exceptional impact resistance thanks to this 3-layer construction.

Sleep protection reduces the risk of concussion to the most vulnerable part of the skull, the temporal region. Behind the temporal bone lies the meningeal artery. The slightest trauma can damage this artery and form a hematoma, compressing brain cells and causing serious after-effects, even death. The Voronoi helmet is the only helmet that takes into account the temporal region. The rigid helmet shell protects the sleep by absorbing and distributing the shock wave over a large surface area, while reducing the possibility of hitting the sleep zone if the force of the impact were to deform the tip of the helmet.