rbarchi,
I believe it's a large. It's the KBS Super X7-Stealth black/grey
The issue with the glasses is, now that I wear glasses especially to see the guages and GPS, I need to put goggles over them. I always wore goggles but now have glasses under them. It get to be quite a tight fit and kinda a pain to put 2 layers of eye wear on/off.
It's not the helmets fault by any means. This would happen with any moto helmet and does with my old Bell-Moto3. Hows that for dating myself!
I think a shield option on a dirt bike helmet is a good idea.
I would like to put one on the KBC if I could.
DJ