Drawing from moto design, these biker boots are crafted from premium nappa leather that's tanned a petrol-black hue and designed with tabs so you can pull them on without creasing the hide. The hardwearing chunky soles have modern appeal. COS supports responsible manufacturing via the Leather Working Group Upper: 100% Nappa leather. Lining: 100% Polyester. Insole: 100% Leather. Outsole: 100% Thermoplastic rubber. Excluding trims