Difference between gum wall and skin wall tires?

[schwinnmesa]

Is there a difference between gum wall and skin wall tires? :?

 

[66olds98]

From what I gather "Gum wall" tires have rubber compound from bead to bead, "Skin walls" do not, they have just the weaving...
Here's a forum discussion, http://www.bikeforums.net/archive/index ... 04462.html