Arche: Womens Calari Sandal - Arche uses natural principles and research into biomorphic design to allow each shoe to adapt to your individual foot - For ultimate comfort Arche utilizes 100% milk fed latex soles to maximize flexibility - Natural supple leather is maintained by the development of traditional tanning techniques that do not alter the leather after processing. - The velvety aspect of the nubuck enhances the natural quality and the softness of each shoe.