Getting air to move over your head at higher speeds is relatively easy but it’s when laboring up a long, steep climb on a hot and humid summer day that we desperately need to bring in some cooling airflow, and give hot air a path to escape.
Not surprisingly, this is where most of the helmets fared relatively poorly as it’s much easier to design an aero helmet when you don’t have to account for airflow through as well as over and around the shell.
This was again a subjective scoring process based on ride evaluations on various climbs with speeds primarily hovering around 10mph.