Kérastase Soleil Masque UV Défense Active is an after-sun treatment to repair coloured hair exposed to the sun. It protects against both UVA and UVB rays by creating a hydrophobic barrier, by strengthening the hair and improving the surface to the hair. // Hair is left soft and shiny with long-lasting colour radiance. The Kérastase Soleil range is the first range to offer customised protect and repair indexes for your hair.