EVA Foam is a great material for constructing costumes and props of all different kinds, from period armor and swords to slick futuristic robots. It is especially beloved by cosplayers and prop makes (Diy Costume Ideas)
How To Make a Foam Helmet,Tutorial Part 1 - This tutorial is pure gold. Evil Ted Smith walks you through how to create first a pattern and then how to make the basis for a helmet. I cant wait to try making my own.