my extreme internet searching got me $70 off my Suomy Spec 1r. I didn't try one on before buying because the only place I know of around me that sells Suomy only has the Gunwind model (which is lower than the Spec 1r). but their US website lists the hat size (such as 7 1/8) next to the S,M,L, XL sizes so that helped. I was a medium in my HJC but it was a tiny bit big but a small was too small but the medium in Suomy is a perfect fit. And I can't fog that sheild either, just my glasses. I paid $50 for a mirror iridium sheild, kinda sucks its so much but the few times I got to ride with it it was nice. does seem to actually block heat from entering the helmet just as they claim. Even though I didn't do it I'm still with Max on trying one first.
edit: oh yeah if you wear glasses that is important also. a lot say glasses or goggle friendly for us vision impaired. I tried on some new Shoei a couple weeks ago at the dealership just cause the graphic looked awesome but then I couldn't even struggle to get my glasses in. what kind of $500+ helmet can't fit glases.