The 4S First Lady Hybrid Glossy Black GPA helmet is created to provide optimal safety. This helmet is designed from 4 layers which provide successive shock absorption as well as better resistance to lateral compression. The breakdown of the 4S: 1S: external shell intended to absorb a first part of the shocks. It is made of absorbent polymer and designed to deform under impact 2S: during an impact, this interface, designed in an elastomer developed for Formula 1, will absorb the energy of the impact to absorb it 3S: this is the main shell, reinforced with fiberglass, it ensures rigidity and protection. The shock is already cushioned when it is reflected at this level 4S: the EPS shell finishes decelerating the shock by crushing under the pressure of the impact, thus protecting the skull and minimizing the risk of head injuries External shell: injection molded in thermo-composite resin which limits the risk of perforation. Thanks to its front openings and rear extractors, this GPA helmet offers optimal ventilation. Inner shell: EPS shock absorber element in variable density expanded polystyrene which cushions and distributes shock waves. Foam: comfort foam coupled with a soft and antibacterial fabric. Made in one piece, it is interchangeable and washable thanks to tabs which are inserted between the two shells. Visor: made of thermo-composite elastomer resin which gives it a certain flexibility according to required standards. Why choose the GPA Hybrid chinstrap? For fans of the soft chinstrap Better support and better protection thanks to its extension on the nape of the neck Maximum comfort thanks to the new interior A new two-part attachment loop that is very easy to attach and undo.