The bovine leather comes from farms in Uruguay, a country known for its culture of animal husbandry and the quality of its leather. It is tanned, respecting the REACH norms.Specifications:- Upper: Leather- Panels: Leather- Logo V: Amazonian rubber (26%)- Insole: Amazonian rubber (11%), bio-based E.V.A. (42% sugar cane), recycled E.V.A. (11%), organic cotton (12%) and others (14%)- Outsole: Amazonian rubber (40%), silica (23%), recycled rubber (10%), synthetic rubber (11%) and others (16%)- Lining: Tech (100% recycled polyester)- Laces: Organic cotton (100%)