Two helmets, a modular/full-face and a 3/4.
The full-face is for the EX250 with its low fairing and lots of air flow.
The 3/4 is for touring behind the Concours windshield, it gets better ventilation in the heat, and in inclement weather, allows you to wipe the inside of the face shield with your left index finger to remove the fog/rain/whatever.
Both have their uses.