5 Eyelet Brogue Bex sole in the classic black and white color run. Leather: Smooth leather is a hard wearing corrected grain leather with an unblemished finish. This is a Goodyear-welted product. The upper and sole are sewn together, not merely glued, like many footwear constructions. This, together with our Z welt-stitch and heat-sealing process, makes it unique to Dr. Martens. Definitions Leather