Hi TossingNTurning,
It’s always a good idea to have a good cover to protect the latex from oxidizing and breaking down prematurely from exposure to air, ozone, and ultraviolet and other substances that can degrade latex.
The closest you could come would be a stretch knit zip cover that would have less effect on the contouring of the latex than the wool quilted cover you currently have. The component post here has some sources for covers and post #4 here lists the ones that I’m aware of that sell stretch knit covers.
Phoenix