Kérastase Resistance Serum TherapisteThe Benefits: Repairs very damaged hair fiber. Heat protectant with 450F thermo protection. Essential nutrition for healthy hair. Soothing texture for itchy scalp. How to Use: Apply 1 2 pumps of Serum Therapiste from mid lengths to ends on towel dried hair. Leave in and proceed to blowdry as usual. Can also be used as a finishing touch on dry hair to control flyaways and seal split ends.