Oiled Leather Upper / Classic Footbed - Suede Lined Has a visible grain and naturally occurring colour irregularities that are not removed in order to preserve the matt surface. 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.