SUNNY-DAY FAVORITE A must-have for the season with its easy elegance, comfort, and sleek silhouette, the Nadia Mule is crafted of full-grain leather, a molded rubber sole, and an open toe for a chic look that you can wear anywhere. You won’t want to take these off. UPPER: Full grain leather upper. Pigskin lining. FOOTBED: Die cut memory EVA footbed, pigskin top cover. MIDSOLE: Molded rubber midsole. OUTSOLE: Molded rubber outsole, leather wrapped heel.