[lugerholsterrepair]

Tom, You could be completely correct...I really have no way of knowing except that I have examined these original boots and it is something along that line. It does not appear to be very thin however. It seems at least as thick as the leather of the outside of the boot if not thicker in places. I would say one tenth of an inch in most cases. Formed by pushing it into the boot with a form, like a wooden dowel formed to the oval shape. Then sewn around the top edge. I noticed most had some compression slits cut in the front and side. Quite the strange way to make these things. I would sure like to know why this material was employed.
Ron Smith ventured a supposition or two...Seems like there would be an easier way....

Tom, you don't happen to have a Nazi Police buckle you want to sell?
Jerry Burney