Mine doesn't have the lambs wool underside and sits on paint protection film. The bonnet is also polished alloy.
My previous car had one with lambs wool till I took it off , that had worn the paint off the top of the louvres.
I use a leather cleaner & balm when I annually treat the leather. I usually undo it to wash the car & I clean the underside of the leather. You don't want grit in the lambs wool as it will grind of the paint.
