Think they’re a lost cause? Maybe not. Here’s a before and after of some pretty destroyed soles.
Here’s the after. Had to make a new welt to replace the old one then re-cork before re-soling. There is a section of rubber at the toe (often the first place the sole wears) to extend the life of these new soles. It blends right in and still maintains the customers desired effect of the leather soled dress shoe.