Calf Box leather has been a heritage staple in the Hermès oeuvre for nearly a century. Its smooth almost glossy finish is unmatched and has been proven to stand the test of time, acquiring a distinct patina with regular use. Box leather is also renowned for its ability to be restored to nearly new condition from almost any state. While Hermès has been producing Box leather bags for decades, today, the traditional leather is reserved for special highly limited production runs especially when it comes to Birkin 30 cm bag.