Kérastase Première Sérum Filler Fondamental 90mlKrastase Premire Srum Filler Fondamental is a lightweight leave in treatment designed for inner repair of all types of damaged hair. It helps protect against calcium damage from hard water, humidity, and heat up to 230C. This serum seals the cuticles, reinforces hair strength, eliminates frizz, and leaves hair smooth, glossy, and easy to style. For best results, use with the rest of the Krastase Premire range.