Cavallo is a vegetable-tanned calf leather made from selected hides of Italian calves. It is greased to make it water resistant and exceptionally supple (it remains nonetheless vulnerable to scratches). It gradually develops an attractive patina over time.
Clean with a dry or very slightly damp cloth. Ideally, use Heschung polish or cream of the same colour as the shoe. Apply sparingly, leave for a while and then buff with a wool cloth.