Hey! Can you share the link where you found this picture? I am actually modelling an x31 in 3d and this kind of documentation can really help :)
Sorry, don't recall and don't have a copy of the doucment that it came out of. If I find anything I'll post for you.
 
Helmet developed for the X-31, part of my personal collection -The Rockwell-Messerschmitt-Bölkow.jpg

I found this Experimental Gentex/Honeywell Flight Helmet picture as a part of the development for the X-31 EFM program.

Installation of a Helmet Mounted Visual/Audio Display (HMVAD) was completed on the X-31 in October 1993. The purpose of the HMVAD was to provide out-of-the-cockpit situation awareness and simulated helmet-mounted sight to the pilot during high angle of attack combat maneuvering.

The system consisted of a Honeywell helmet with symbology projectedon its visor by a monocular Cathode Ray Tuge. Also included was a Polhemus head tracker and an angle-of-attack audio cueing device. Both of these features were demonstated on the X-31 during post-stall close-in combat.

Although the picture quality isn't great as the one I uploaded here, here are few more pictures and explanation;

http://www.salimbeti.com/aviation/helmets8.htm
Original picture origin;

View: https://www.instagram.com/p/CPP_1w0hS6F/?igsh=MWxjeDM0Zzg3cjZ0Zg==
 
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