I don't know the exact name of the material, but I bought an expensive cover for my Vette, made of some Kimberly Clark material that is basically a high tech paper.
It was a total rip off. Whatever you do, don't get one of these that are a nonwoven material.
Best of luck, and keep that beauty covered,
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in