Or PVC lol. I drove a friend's Contour SVT and the knob was mushy and melting in my hand. Although the Pleather GSR shift knob I have in my Insight holds up great (chose it over the actual leather one from different years because it is much harder-wearing)I've experienced it with my Genesis and it was tinted. Swapped it back to stock right after.
California summers are not kind to metal shift knobs.