The Shu Uemura Art of Hair Ultimate Reset Duo-Serum combines two winning technologies to strengthen very damaged hair, prevent split ends, prevent future hair breakage and create long-lasting shine and softness. Formulated with two different types of hair oils to give hair the ultimate hair care, while leaving hair light and smooth without any greasy residue. Safe on coloured hair so your hair color can thrive without sacrificing the health of your hair.