Show Me Your Mumu Stanley Sweatshirt in White. - size S (also in L, M, XL, XS) Show Me Your Mumu Stanley Sweatshirt in White. - size S (also in L, M, XL, XS) Mama. Cotton blend. Imported. Machine wash recommended. Jersey fabric with front screenprint graphic. Item not sold as a set. SHOW-WK176. MS4-4275. Mumu is not simply a garment, it is a lifestyle. Spontaneous. Fun. Easy going. Unique. Versatile. Imaginative. It all encompasses the mumu, and a way of life.