I have not seen a thread that did'nt talked about other materials to make a helmet other than cardboard, paper, clay,...
I have made 1 helmet *my first by the way* that I sculpted out of touch'n'foam (liquid styrofoam in a can).
I tryed the clay but I aint a professional when it comes to sculpting in it.
So I use styrofaom and sculpted the helmet out of it and it did a good job.
If you are a beginner like me and would like to know what are the tools you need I can post it here also.
For now here is a step-by-step progress in pictures.
Let me know what you think!
Thanks for looking.