This series was designed with a product point of view that is sustainable society = sustained society. Minimalistic design leaves only what you really need instead of adding more features or value. This is a smart and compact series. Cordovan on the front is a natural glazed finish. It produces a deep, natural sheen, and the more you use it, the more you enjoy it. Cordovan (horsehide leather) is finished after about 6 months of age by Japanese tanners boasting the world's leading technology from European sources. The minimalistic sustainable design makes it thin and compact. The interior is made of tanned leather, so you can enjoy the change of time.