Kérastase Chronologiste Restorative Overnight Hair Serum works while you rest, targeting visible signs of hair ageing in just one night. Designed to enhance body and smoothness, this overnight leave in treatment helps hair look stronger, shinier and more youthful. As you sleep, the serum helps to plump the fibre with moisture so hair appears fuller and healthier. Conditioning agents and nourishing oils support softness and visible shine through the lengths, while also helping to tame flyaways and improve manageability. The result is hair that feels smoother, looks revitalised and is more manageable. With continued use, this Kérastase serum helps address five visible signs of hair ageing, adding strength and shine while restoring bounce and movement. The experience is elevated by the signature Chronologiste fragrance of bergamot, rose and musk.