El Naturalista EL VIAJERO BOOT women Mid Boots in Blue , Available in women's sizes. 7. Cow leather upper Leather lining (80%) and polyester (20%) Cowhide upper and lining Committed to the preservation of the planet, the El Naturalista brand gives priority to the use of biodegradable materials in the manufacture of their products. They are worked in a natural way by altering them as little as possible, so that in the end we can feel their natural textures and fragrances! El Naturalista designs their products with eco-friendly materials.