The stylish Ugg Nightfall boot is made with twin-faced sheepskin and a durable molded rubber outsole. The wrap around lace feature adds a fashionable touch with wooden beads at the end. A removable and replaceable sheepskin insole gives extra comfort and warmth. The Uppers of Ugg Nightfall boots are twin-faced sheepskin with suede toe and heel guards. Insoles are removable & replaceable. Insole is made of sheepskin, latex.