The Century helmet is the result of 100 years of expertise. By integrating all our knowledge and user requirements into one concept, this is a helmet that doesn't compromise on protection, comfort, aerodynamics or visibility. The Century offers it all! The unique Twist Cap offers a twist-of-the-hand action to change the Century from a full-ventilated helmet into an aero helmet. Changing the twist cap can save you Watts, or up to 11% more ventilation