Up for sale are these beautiful pre-loved Mustard Yellow Tieks, size 12. There are some use marks, but in otherwise great condition, with lots of life left. Make a modern statement in Mustard Yellow Tieks. From the boardroom to the beach, Mustard Yellow is a striking, sunny style sure to bring any wardrobe to life! 100% premium, soft, full-grain leather ballet flats Non-elasticized, cushioned back Non-skid rubber soles and comfortable cushioned instep.