ULTRA DERBY BLACK LEATHERUltrasound is sound waves with frequencies above the audible limit of human hearing. Aka its high end. Its a premium piece of equipment. Calf leather upper, suede trims, printer leather spoiler, full leather lining, lightweight EVA midsole, hardwearing outsole etc. etc. The world of sneakers is very noisy, perhaps you want to formalise? Looks great with tailored trousers or Dickies. The reflective tab on the heel could save you life, although I