For those of you that have used a 3m speedglas headband inside your helmet, i was wondering what model you went with?? there are several choices on amazon and some seem larger than others. I am getting the Altmann helmet and want a nice headband in it but dont want it to be too big for the helm or have to make to many mods to it to get it to fit. anyone have a 3m speedglas headband and can help i would be thankful.