Yume Yume Ballerina Flats in Black - BA0005. Inspired by the elegant design of the classic ballet shoe, these Ballerina Flats feature signature puffiness and wrinkles from our Camp shoes. They come with removable straps in vegan leather and silk material. Upper: Vegan leather (60% PU, 40% PU), Straps: Silk (72% VI, 28% SE), Lining: 100% Microfiber, Outsole: 100% Leather.