Today I went to Berts and tried on a medium Shoei rf-1100 and it fit snug but not too snug. Then tried of the small of the 1100 and it was too tight not even allowing the crown of my head to go all the way up. Then I tried on a AGV-GP tech size small and it fit fine, snug but not too snug. So I was wondering if anyone knows if these two companies run different or maybe its my dome? (more info they only had size smalls in AGV so I could not see what a medium fit like).