This construction is a cement lasted boot with a Unit Sole.
The Leather upper is cement lasted around the insole.
The cavity then has a carbon fibre shank inserted and is cork filled.
The Cork rubber compound unit sole is then bonded to the boot.
The sole is then Stitched (sewn) through the sole and the insole.
This ensures the sole can never peel even if the bonding fails.
The heel is then internally gang screw nailed to support spurs and boot removal.