Kérastase Resistance Fibre Architecte (30ml) is the world's first hair care product that works on the worst areas of damage and blocks in the gaps in each strand. It helps your hair begin the rebuilding process, starting at the root and running right to the tip. This non-greasy serum will seal split ends, add shine and act as a perfect finishing touch. It is made with Intra-Cylane to boost broken fibres, pro-keratin to repair any damage, and ceramides to visibly smooth your hair. Apply to dry hair from the mid-length to the tips, then straighten or blow dry for added sleekness.