What you see here is a replica Thor helmet ($550). It's made of plastic but has "copper flame tubes raised above the helmet so that there is no heat transfer from the tubes to the helmet." You hook that sucker up to a little propane tank tucked away in your pants and you're good to go. Use the adjustable valve to set flame height and burst action. Awesome. You can really tell this is a quality helmet. If quality is a function of the helmet's ability to burn your house down.
Several more pictures after the hammer.
Flaming Thor Helmet [7gadgets]