- Materials: Upper: ChromeFree leatherPanels: ChromeFree leatherLogo V: Synthetic rubber (40%), mineral silica (22%)Insole: Bio-based E.V.A. - sugar cane (55%), organic cotton (19%) (lining)Outsole: Amazonian rubber (31%), mineral silica (31%), synthetic rubber (19%)Lining: Recycled polyester (100%)Straps: ChromeFree leather