Which characteristic must all helmet types have according to MA2?

All helmet types must be ASTM-SEI certified or have an international-equivalent certification as a requirement outlined in MA2. This standard ensures that the helmets have undergone rigorous testing and meet specific safety criteria, providing adequate protection for the wearer. The ASTM-SEI mark indicates that the helmet has been evaluated for its performance in various conditions and adheres to the necessary safety specifications.

While characteristics such as being lightweight, brightly colored, or sourced from a certified vendor may be beneficial for different reasons, they are not universal requirements established in MA2. The focus on certification highlights the priority given to safety and protection in equestrian activities, ensuring that all participants are using gear that has been deemed safe according to established standards.