Helmet MTB Endurance 5.0The Endurance 5. 0 helmet is built for racers who demand advanced protection, aero efficiency, and comfort that lasts to the finish line. Co developed with elite XC and gravel athletes, this helmet delivers race day performance with maximum ventilation for hot efforts and an aerodynamic edge for long miles. It features 360 Turbine EVO Tech, a triple density system that helps reduce rotational forces and absorb low speed impacts, and the BOA FS2 Fit