The 1461 Mono shoe's sole, welt, stitch, eyelets, laces, heel loops and even linings are identical colors. The Core collection features our classic styles with new colors and materials. Made with our classic smooth leather. 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 our 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.