The Protone is surprising for its generous size and number of vents. The upper rear of the shell is essentially solid, though, and as is common for newer aero lids, the Protone sports an overall shape that’s very trim and compact, with a notably truncated tail that apparently creates less of an air brake effect.
Like the Course, the Protone fell mid-pack when it came to the wind tunnel tests but its outstanding high-speed ventilation brought it well up in the overall rankings. Low-speed ventilation wasn’t as good but it was still quite reasonable with only limited airflow in the restricted brow area holding it back.
The Protone did very well in the aesthetics department, too, with a bold shape that somehow manages to be both eye-catching and fast without making its wearer look like something out of a sci-fi movie. Unfortunately, this sleek Italian lid was also one of the most expensive.