I can’t recall what the molds are made from, but they are metal I think. It is generally a more expensive and complicated process and one done by very few specialty suppliers (not in the footwear fty).
There are three parts to the process- first the lamination of the hot melt film to the back of the material, and second die cutting of the material, then the hot press lamination of one part to the other within the mold.
The machines are Korean or German I believe.
R