midnight mender overnight strength repair treatment100ml The overnight repair mask to strengthen hair helps say goodnight to damaged hair. Repair the signs of damage for hair up to 9x stronger when you wake up.* A clinically proven overnight treatment that revitalizes and smooths hair to reduce breakage and restore strength while you sleep. Hair types: All hair types, particularly weakened and brittle hair that has suffered damage from heat, chemical treatments, mechanical aggressions or environmental