In the event of a collision, the impact is optimally dissipated thanks to the micro-movements that are better distributed over the entire surface. Reduces its size by 45% in one second You can conveniently store it in any bag or backpack. Its rear adjustment allows it to adapt to the head by simply pulling the rubber bands, protecting the nape area. Complies with CE EN1078 and CPSC safety regulations. Weight: 340g.