What happens to a hair continuously exposed to the sun? It becomes vulnerable and defenseless, loses its color intensity becoming arid, sensitized and opaque.The Kérastase Soleil line is an exclusive treatment to protect and repair hair from UV rays, without sacrificing cosmeticity: shiny, always soft and beach-proof hair. The Soleil line composes a protective range that cleanses, improves shine and adds to the hair fiber oils that combat hair drying, making them finally smooth and shiny.