here's a tip on the pro-tech wake:
as soon as you're figured out where you want the plastic piece at the back set at, glue it in. (make sure you wear it at least once riding before you glue it, the helmet sits different when your hair's wet).
I got hammered on a 3 and that plastic bit came off. Too concussed to realise anything, so lost it. But helmet seems to work fine without it
SOme people glue in the ear protector bits as well, for same reason.
my $0.02