PVC stands for Polyvinyl Chloride....
anywho, anything made with that is PVC, they make thin (ie tenths of mm) to think (an inch or more) sheets out of the stuff, which I'd imagine, could get fairly nicked up when getting used to it as a top sheet but should be plenty slick.  I have no idea where you'd find it though, or how much it costs.
The only other thing I know is that they manufacture a bunch of it in China.