Just to keep in mind that any helmet set up for air can and should be modified by the owner/user to suit their needs. I'm not suggesting that anybody cut holes in their helmets, but there is no reason why the front area/chin bar can be tweeked for better flow or pattern. It takes nothing more that a little semi rigid padding to create better air passages. I have used closed cell padding to space the gap between the cheek pad and the air entry for better flow. It is not unusual to have a helmet that fits tight in the cheek pads to force the entry partially closed. So check airflow with and without the helmet on. Nothing more that a hot glue gun, and a pair of sissors, a razor blade, are required for tools and common hardware store foam tape. I have even used beach thongs/sandals for more rigid foam.
Related, it is highly unlikely that you can find a helmet that fits without making changes. Don't settle for having the cheek pads push your cheeks into your teeth if you open you mouth. Small changes in the thickness of the cheek pads can make a big difference in the helmet fit. So don't be afraid to pull the cheek pads out to cut them to fit right. Usually I would start by shaving each pad by an 1/8" off the back of the pad with a straight razor blade.
The helmet companies provide this service to the pros, the rest of have to fend for ourselves, or settle for whatever mass produced stuff they offer.
