Every pair of Birkenstocks is made from the highest quality materials. Smooth Leather Upper / Classic Footbed - Suede Lined Smooth Leather has a very fine grain so the surface feels smooth. The leather is durable and easy to clean. The essence of all our shoe models is the original Birkenstock footbed, which is inspired by the natural imprint of a foot in the sand and feels just like walking barefoot. Its anatomical shape ideally supports the natural walking action of your foot. Your feet, joints and back are protected. At the same time, your foot and leg muscles are exercised, and your health and well-being benefit as a result.