Posted by Anthony Appleyard on
URL: https://www.shado-forum.com/RE-Rotating-Helmets-Reason-for-the-shoulder-apron-on-alien-spacesuits-tp1504316p1504317.html

A fixed liquid-filled helmet big enough for the head to rotate freely
inside, would contain an unwieldy weight of the liquid. The helmet
would have to fit the head, and rotate. Alien technology would be
advanced enough to make a rotating helmet without much extra weight
of mechanism.

Fixed helmets where the head cannot rotate, are known in the real
world :: USA astronauts call this nuisance "alligator head".