EXCLUSIVE AT MR PORTER. Yuketen's work boots are crafted using premium suede sourced from the family-owned Opera tannery in Tuscany. Designed with pinked welts, they're trimmed with leather along the padded collars and set on lightweight, durable Vibram Morflex rubber soles for grip. Lower Impact Materials. This product is made using at least 50% lower-impact materials or ingredients. Find out more about our Consciously Crafted criteria here.