Color: black patent material upper: synthetic size recommendation: we would recommend you to order a size up platform height: 1 cm closure type: buckle article number: sm11003502-02002-018 recycled materials this product is made with 29% grs certified recycled pre-consumer natural rubber, 11% grs certified post-consumer abs and 11% grs certified recycled post-consumer tpu certified by control union. [license number te-00111714.]