Product Overview Indulge with Kérastase's Thermo-Reactive Masque to provide intense nourishment for dry & sensitised hair. Benefits Trap the nourishing elements of this masque deep inside the hair fibre with our heat activated formula for beautifully cared for, hydrated hair. Key Technology This masque is formulated with Deep Nutrition technology, an exclusive complex of nourishing agents. The thermo-reactive formula traps the nourishing elements deep inside the hair fibre, whilst Thermic Protection creates a protective film to help prevent dryness.