ADA (est. 2004) Was founded by Ada Deferrari, a Polish-American stylist and designer after moving to Buenos Aires. Argentina, a country known for its production of cattle and beef, in turn provides sustainable leather production processes. Due to the country’s reliance on cows and their place in the ecosystem, processing hides for leather allows for less waste and the cow’s life cycle to continue. ADA uses only vegetable tanned leather, an ancient and organic process that relies on natural tannins from tree bark and plants.