Helmets modding

Hello everyone,

Can someone explain to me how the helmets work. does it Take the hair of the hearthling into account or do you need to make a complete new head with the helmet on. i want to create one that covers half of the face, and need to know if the hair in some way can clip throught the helmet

Yes the hair can stick through it just adds to the model. I did some helmets which cover the face in some parts.
Sometimes that is a little problem with the female ponytail.