The feminine Mayari style is ready to complement a light summer dress or your favorite blue jeans. You'll find it offered in basic rich oiled leathers, matt finish Birkibuc, or playful colors that shimmer in the sunlight.Oiled leather can be recognized by its untreated surface. Birkenstock purposely does not treat surface grains and other characteristic features. Birkenstock uses sturdy leather with a thickness of 2.8 to 3.2 millimeters as upper material.