. . . . . . "Ionomers, (i.e., ionically crosslinked polymers such as the copolymers used in the examples, particularly copolymers of ethylene and an acrylic or methacrylic acid), vinyls, fluoropolymers, polyethylenes, cellulose acetate butyrate, polycarbonates, and polyarylates are other examples of polymers that may be used in sheeting of the invention." . .