Originally Posted by
kbarch
Look CLOSELY at finishing and details - the straps, warning labels, care instructions, etc. Absence of secondary labeling, loose untrimmed threads, mis-alignments, excess glue, etc., are generally a dead giveaway. Never mind forgeries, these are signs of quality control and care (or lack thereof) that one should look for regardless, especially if buying second-hand.
Thing is...Giro for instance has had models and model years full of helmets with excess mold flashing left over and generally poor finish QC.
Best thing, buy from legit dealers and buy new. Forgers have gotten damned good at what they do.