Kerastase Strengthening Duo The perfect kit for a getaway or weekend away the Keratase Strengthening Duo combines the benefits of Bain de Force & Ciment Anti-Usure to give weak tired hair loads of lift & vitality. Formulated with a dual action formula; Vita-Ciment & Vita Topseal work together to strengthen & nourish weakened hair. This pack contains the following products: Kérastase Bain de Force – 250ml Kérastase Bain de Force is a reinforcing & refreshing shampoo for weakened hair. Its strengthening formula will gently cleanse whilst adding body & vitality to leave your hair stronger & shinier & with enhanced health. Kérastase Ciment Anti-Usure – 200ml Kérastase Ciment Anti-Usure is the first double reconstruction treatment for weakened hair with Topseal protection. It works to rebuild your hair’s internal strength & leaves it full of body vitality & shine whilst feeling incredibly soft.