IF YOU THINK it’s hard to make a helmet that costs $400,000 without the liberal use of solid-gold elements or diamond-encrusted details, you don’t know about the F-35 fighter jet.
https://www.wired.com/2016/06/course-f-35-comes-400000-augmented-reality-helmet/
We will all need helmets in 2017... but $400k is out of my range.