The 4S First Lady TLS Brilliant Blue 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 Twin Lock System GPA chinstrap? Very resistant, it is made of thermo-composite resin and injected fiberglass. - Unrivaled stability and support Optimal security with greater protective coverage, especially on the neck Thanks to its rigidity, reinforcement of the entire helmet in the event of a crushing, like on motorcycle helmets Significantly improved fields of vision More comfort: for soft touch contact with the rider's skin, removable foams have been added to the temples of the TLS. No more problems with poorly adjusted chin straps: the size of the Twin Lock System is adapted according to the helmet shell for optimal support! Its closure with the Fidlock magnetic buckle allows for easy and smooth attachment.