Upper MaterialSmooth Leather. Slightly shiny surface, with good resistance to abrasion.BucklePowder coated for protection against corrosion. Attached with 4 inward curving clamps.FootbedOriginal BIRKENSTOCK footbed. The famous anatomically shaped cork latex core, between two jute layers.Footbed liningSuede leather lining 2.8 - 3 mm thick. This provides an optimum climate for your feet and unsurpassed wearing comfort.Sole unit10mm EVA. A great shock absorbing and lightweight material, offering exceptional grip.AdhesiveEnvironmentally friendly water-soluble and solvent free adhesive.