The krastase chronologiste duo is two step treatment designed to transform dull tired hair the unique advanced formulas provide essential nutrients and moisture to recover hair to leave it feeling silky smooth kn the set contains krastase chronologiste revitalizing bain shampoo 250ml regenerate locks with krastase revitalizing bain shampoo a concentrated care formula that combines vitamins a and e to cleanse and revitalise hair from top to bottom perfect for all hair types the s