I think they fit on the smaller side, based upon my experience. What do you wear now... If you can give me an idea I'll see what I can do to help you. Brands that I have other than the Motorfist Kali helmet are as follows: Troy Lee Design, Fox, Fly, Scorpion and HJC... we can try to figure out your size based upon your head dimensions and what you currently wear.
I am good at CSI ing people's fit
Will you have helmets at the show??