Dr. Martens' classic smooth leather is durable and famously stiff to start with; it molds to your feet and gets more comfortable with wear. Made with Goodyear welt, the upper and sole are heat-sealed and sewn together, not merely glued, like many footwear constructions. This, together with their Z welt-stitch and heat-sealing process, makes it unique. Dr. Martens have an air-cushioned sole, are oil and fat resistant and offer good abrasion and slip resistance.