It's a very fine mesh - don't know whether it's nylon or metal, but while it's nearly transparent it does hold a shape so I'd guess metal:
http://startrekpropauthority.blogspot.com/2009/05/star-trek-at-smithsonian-dr-mccoy.html
I never noticed??
I do remember in TAS they had some sort of portable 'force feild to keep them safe, but I guess the FX of the day prohibited that way around the scene.
Plus, the mesh allowed far more ventilation for the performers (at least their faces), and because it was not a solid material, the breath of the actors could not fog it. All things considered, using a mesh was a very ingenious solution.
Sincerely,
Bill
It does beg the question of how you grab something if you're encased in a force field...
Very effective use of one material to simulate another. It took me 40 years to notice.
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