description:O.T. Leather (Organic Traced) comes from 100% certified organic farms in Uruguay, a country known for its livestock farming culture and high-quality leather. This is VEJA's softest and thinnest leather. It is mechanically treated to gain suppleness and finesse, then tanned in Brazil using fewer dyes than conventional leather. VEJA uses dyes that comply with regulations and ensures responsible water use during the tanning process. fabric:Upper: Organic Traced Leather (O.T.)Panels: Organic Traced Leather (O.T.)Insole: Amazonian Rubber (11%), E.V.A. Bio-Sourced (45%, including 36% Sugar Cane), Recycled E.V.A. (13%), Organic Cotton (5%) and Others (26%)Outsole: Amazonian Rubber (40%), Mineral Silica (23%), Recycled Rubber (10%), Synthetic Rubber (11%) and Others (16%)Lining: Recycled Polyester (100%)Straps: Organic Traced Leather (O.T.)Made in Brazil Using a washing machine is strongly discouraged to prevent altering the properties of the materials. Waterproof your shoes using a product appropriate for the material. Repeat every 3 to 6 months. Maintain the smooth leather of your shoes with a damp cloth and a specific spray product. Finish by applying a protective balm. Repeat every 3 months, or as needed based on the condition of your shoes. Let dry in open air, away from heat sources (such as sunlight or radiators), to prevent any discolouration. measurements:This fits true to size. Take your regular size. Size 36: 22.6cmSize 37: 23.3cmSize 37.5: 23.7cmSize 38: 24cmSize 38.5: 24.3cmSize 39: 24.6cmSize 40: 25.3cmSize 41: 26cm