The Spiral Zip Boot in Nero is handmade in the hills of Marche, in northeastern Italy, from supple full grain Vachetta calfskin that has been vegetable-tanned to a deep, rich black. They feature a custom developed leather and rubber outsole, tumble washed and aged for a vintage finish. Silver Excella locking zippers, imported from Japan, run asymmetrically along the ankle shaft and finish with a leather pull tab..