Hair which leans to the dry and frizzy side needs a bit of help to look its best, and that’s where Kérastase Chronologiste Thermique Régénérant Treatment comes in. This leave-in conditioner protects the hair against heat up to 230 degrees Celsius, reduces frizz, seals the cuticle against humidity, and generally makes your hair look fabulous. You can expect a smoother, more refined look when blow-drying with a bit of this in your hair. Love that.