I tried on a couple different Scorpion helmets, and none seemed to fit me very comfortably. My HJC fit's well, has a nice big chin skirt, quieter than the cheap Zox that I had before, Integrated Sunshield, etc... The top vents don't seem to do much, and the front only does a little, which is enough to help defog when the fogging is too much for the coating on the visor. Anyway, make sure you go try one on somewhere if you're buying it online. You want to make sure it fits well.