A lightweight leave-in treatment by Kérastase, the Première Anti-Frizz Reparative Filler Serum offers heat protection up to 230°C* and up to 72 hours* of protection from flyaways. The serum is suitable for all hair types and works on all types of damage including damage from heat tools, colour, bleaching, colour treatment and over-processing. Because of its increased porosity, processed hair can absorb up to three times more calcium from water than untreated hair, leading to a calcium overdose. The lightweight, balmy texture of the serum acts as a shield on the hair's surface to protect against damage. When used with the Première routine, the serum visibly repairs** all types of damaged hair and restores hair's original strength***. Supporting an ultra-smooth finish, the hair serum minimises the look of dry, brittle lengths and split ends, plumping the fibres with moisture for a stronger, glossier appearance. A blend of peptides and amino acids nourish and hydrate, while the formula defends from humidity to encourage a visibly sleek and silky style. *Instrumental test **Instrumental test after continued use of full Première routine. ***Instrumental test on bleached hair after continued use of the full Première routine vs. non-bleached hair.