Both the leather & hi-gloss shoes sole have a "Goodyear welt construction" with an oil-resistant polyurethane outsole.

"Goodyear welt construction" involves stitching a welt (a synthetic leather strip) to the upper and a strip of canvas (known as "gemming") cemented to the insole of a shoe as an attach-point for the sole. The space enclosed by the welt is then filled with cork for breathability, and the outsole is both cemented and stitched to the welt.