Roman helmets: Imperial Gallic/Italic and Ridge - comparisons and sources

[Crispianus]

Are you seriously comparing Kevlar® Composite Helmets with ancient metal working.....  the material would not suit multi piece construction even if it was available in 300AD... 

Do you prefer a IIWW helmet?


The concept is the same

The only concept thats relevant here is that a helmet should protect the wearer within reason from the weapons of the time, none of the helmets shown will protect the user against all attacks and are all made using modern machine methods and materials.
To prove your point you'd have to prove that a rivetted helmet construction is less effective then a helmet made from one piece using the techniques and weapons of the period, as most modern helmets are going to outperform their ancient counterparts in many area's but likely fail in others, this would not be a fair comparison.

Ned Kellys bullet proof helmet proved effective but at some cost in weight, The Italian army adopted a similar concept in WW1 for specialist troops the Rivetted Farina helmet :