Bumble and bumble Bb. Curl Defining Creme, 250 ml, Hair Creams and Gels for Women, The Bumble and bumble Bb. Curl leave-in treatment gives your hair everything it needs after washing. Characteristics: tames unruly hair makes hair velvety smooth provides hydration and nourishment for your hair How to use: Apply to washed and towel-dried hair. Do not rinse.