KÉRASTASE Resistance Ciment Thermique Heat Protection Serum 5.1 fl oz — Strengthens, Hydrates Damaged Hair

KÉRASTASE Resistance Heat Protection Serum (Ciment Thermique) is a leave-in blow-dry primer that shields hair from heat up to 450°F while strengthening and hydrating damaged lengths.

This lightweight, strengthening serum is formulated to rebuild and protect weakened hair fibers during heat styling. Infused with resurrection plant sap and Kerastase's Resistance technology, the primer helps reduce breakage, improve elasticity, and lock in moisture so hair looks smoother and glossier after blow-drying. It layers easily with other Resistance-range products for a full repair routine.

How does this serum protect hair from heat tools?

The formula creates a thermo-protective barrier that withstands high styling temperatures, minimizing direct damage to the hair cortex and cuticle. Applied to towel-dried hair before blow-drying, it helps prevent moisture loss and structural weakening caused by heat exposure.

• Thermo-protection up to 450°F for safer blow-drying and hot tools
• Forms a protective film across lengths and ends
• Helps maintain hydration during thermal styling

Will it reduce breakage and restore damaged hair?

The serum targets fragile, brittle hair by promoting elasticity and sealing moisture into the fiber. Repeated use alongside strengthening conditioners and masks helps reinforce the hair shaft and reduce snap-off caused by styling and mechanical stress.

• Strengthening agents repair surface texture and resilience
• Resurrection plant sap provides deep hydration for dry ends
• Regular application reduces visible split ends and breakage

How do I use Ciment Thermique for best results?

Work a quarter-size amount into clean, towel-dried lengths and ends—do not rinse. Smooth through hair, then blow-dry and style with heat as desired; the product works as a primer under other Kerastase treatments or leave-ins.

• Apply to towel-dried hair after shampoo and conditioner
• Concentrate on mid-lengths and ends where damage shows
• Layer with Resistance conditioner or mask for enhanced repair

Will this serum weigh hair down or suit my hair type?

The lightweight, non-greasy texture is designed for use on all hair types without heavy buildup when applied sparingly. Use smaller amounts on fine hair and slightly more on thick or very dry lengths to balance protection and manageability.

• Formulated for all hair types, from fine to coarse
• Use less on fine hair to avoid weighing down roots
• Works well with other styling products and heat tools

Who is this for: KÉRASTASE Resistance Ciment Thermique is ideal for anyone who heat-styles regularly and wants to reduce breakage and dryness—especially those with chemically treated, weakened, or brittle hair seeking improved elasticity and shine. It also fits into a multi-step repair routine with Kerastase Resistance conditioners and masks for more intensive reinforcement.

Ingredients

Water, Cyclopentasiloxane, Propylene Glycol, Dimethiconol, Triethanolamine, Phenoxyethanol, Peg/Ppg-17/18 Dimethicone, Carbomer, Behentrimonium Chloride, Polyquaternium-4, Potato Starch Modified, Hydroxypropyl Guar, Methylparaben, Limonene, Amodimethicone, Cetyl Alcohol, Quaternium-87, Behentrimonium Methosulfate, Quaternium-33, Trideceth-6, 2-Oleamido-1,3-Octadecanediol, Geraniol, Linalool, Glycerin, Citronellol, Citral, Cetrimonium Chloride, Trehalose, Tamarindus Indica Seed Polysaccharide, Myrothamnus Flabellifolia Leaf Extract, Fragrance.