Insulated with 550 fill down, The North Face's Nuptse mules are a classic style refined with a new corduroy upper. These slip-on shoes feature a foldable heel for easy conversion from a mule to a backed shoe. Textile upper Round toe Slip-on style Rubber sole Imported. Men's Shoes - Contemporary Lifestyle > The North Face > Saks Fifth Avenue > Barneys. The North Face. Color: Utility Brown. Size: 9.