The full-face helmet HJC C91 impressively proves that a great bike feeling is possible even with a smaller budget. In order to convey this feeling to bike enthusiasts, the company draws on five decades of experience. For example, HJC is one of the few in the helmet industry to have its own wind tunnel for aerodynamics, ventilation and noise tests. Good conditions for top motorcycle helmets. We'll show you how big the fun factor is with the HJC C91.