Aurix Slip On Mule in Gunmetal Satin Finish Leather from Dr. Martens . An offering from Dr. Martens experimental 14XX line, this silhouette features a slip-on square toe upper constructed from satin finish leather with a contrast lining. Gum rubber outsole wraps up the heel and toebox for protection and support. Finished with layered leather elements and topstitched details. Men's US sizing Dr. Martens product code: 42292020