Good subject, I generally use walking boots but as mentioned to
@mookster the other day get through them like every 6 months!
Iv tried ever type from super strong expensive to inov8 fell running boots. The trouble normally is Ill wear em for just a "quick look" in a mine & if u end up crawling thats the top stitching gone.
So My brother designs footwear & I keep telling him we need a urbex shoe!
In my opinion they needs soft trainer type soles for grip, climbing & not being heard but could do with a kevlar layer to stop nails going through.
Waterproof obviously with leather type top & minimal stitching & prob ruberised toe cap.
I wouldn't say no to the twist lock laces either, is it just me who gets fed up with laces being pulled undone scrabbling through brambles!