The manufacturers said in an earlier comment that the sock is polyester. Not paper. If it is paper then I'm OK with that. But they've said that it isn't.
I may be wrong, the material feels more like a paper hybrid type material than the klir roller I was using. I don't know what the environmental impact is of these products is, but in my mind it's offset by not washing filter socks weekly with bleach along with tossing away 90+ filter socks every year and replacing them. We should all be thoughtful of our waste, for sure.
@Reef Diaper for clarification.