Welcome the springtime in with the Lucky Brand Ester flats. These flats feature a leather or nubuck upper with cute cutouts and stitch detailing at the vamp. Leather lining keeps the freshness by wicking away moisture.nubuck. manmade sole. This shoes / sandals / boots style name or model number is Ester. Color: Wolf. Material: Nubuck Upper and Man-Made Outsole. Measurements: 0.25" heel. Width: M. Made in China.