What material are anti spy screen protectors made of?

I had an anti spy protector for my iphone 3g and I really liked the material of it, its thicker then regular screen protectors so I was just wondering if anyone knew what these were called? I want to get a screen protector for my 4S now made out of that same material just without the anti spy, thanks

It's a polarizing filter, usually made out of a plastic.

Its a polarizing filters. They also use this type of plastic on 3d glass!

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