The goodyear welt is traditionally used because it creates a more comfortable, durable, and sustainable shoe. In this process, a strip of leather, known as the welt, is sewn to the edge of the upper and midsole. Before adding the outsole to complete the shoe, the cavity between the outsole and midsole is filled with leather shavings and cork (a highly sustainable resource). This cork and leather layer serves as a cushion that has ultimate breathability and cradles your foot which eventually molds to you and creates a custom footbed for you over time. When the sole is eventually worn out, the welt may be taken apart and the new sole can be attached back to the welt without altering the imprinted leather and cork midsole. This allows for repairing versus replacing your favorite worn in pair of shoes, encouraging sustainability.