KÉRASTASE Blond Absolu Blonde Guard Hydrating Leave-In Spray, 6.4 fl oz — UV & Heat Protecting, Lightweight Hydration

KÉRASTASE Blond Absolu Blonde Guard Hydrating Leave-In Spray is a lightweight, leave-in milk that hydrates, detangles and shields blonde hair from heat, UV, chlorine and salt water while preserving brightness.

This clear, multitasking leave-in was designed for anyone with natural, highlighted, pre-lightened or color-treated blonde hair who wants daily protection without weight. The formula blends dual-weight hyaluronic acid with vitamins C and E to deliver micronized hydration, antioxidant support and color-preserving benefits. It’s intended for use on towel-dried hair and works as a prep step before blow-drying or air-drying to lock in softness and extend salon-fresh brightness.

How does this leave-in protect blonde hair from environmental stressors?

Blonde Guard creates a protective barrier around the hair fiber that deflects common blonding aggressors. The spray is formulated to resist heat up to 450°F and helps shield hair from UV exposure, chlorine and salt water that can cause dryness, brassiness and breakage.

• Blocks up to 99% of typical blonde aggressors.
• Heat protection rated to 450°F for safer styling.
• Protects color from chlorine and salt water exposure.
• UV defense helps reduce fading and dullness.

What results can I expect for hydration, softness and color maintenance?

The product provides immediate lightweight hydration and helps sustain moisture levels for multiple days thanks to dual-weight hyaluronic acid. Clinical testing indicates visible maintenance of salon-fresh brightness and softness over time when used as part of the Blond Absolu routine.

• Instant detangling and smoother comb-through.
• Deep micronized hydration leaves hair plump and soft.
• Clinically shown to preserve brightness for up to two months when paired with recommended products.
• Non-greasy finish that doesn’t weigh fine blonde hair down.

How do I use Blonde Guard for best performance?

Apply to towel-dried hair, concentrating on mid-lengths and ends where dryness and breakage are most common. Do not rinse out; proceed to blow-dry or allow hair to air-dry to lock in the benefits and prepare the fiber for styling tools or sun exposure.

• Spray evenly from mid-lengths to ends on damp hair.
• Leave in—do not rinse—then blow-dry or air-dry as usual.
• For optimal results, use alongside Blond Absolu Bain Lumière and Cicaflash.
• Reapply lightly before sun exposure or chlorine/swim sessions.

Will this product suit all types of blondes and hair textures?

Yes — the lightweight milk is formulated to perform on fine to thick, straight to curly blondes. Because it hydrates without heaviness and offers thermal and environmental protection, it’s adaptable for daily use across different textures and levels of processing.

• Safe for color-treated and naturally blonde hair.
• Works on fine hair without weighing it down.
• Provides enough slip for detangling coarser textures.
• Benefits highlighted, balayage, all-over bleach and natural blondes.

Who is this for: KÉRASTASE Blond Absolu Blonde Guard Hydrating Leave-In Spray is ideal for anyone who wants to keep blonde hair hydrated, smooth and protected from heat, sun and water-related fading. It is particularly useful for people who use hot tools regularly, swim in chlorinated pools or spend time in the sun, and for those seeking an easy, leave-in step to maintain salon-bright color and soft, manageable hair.

Ingredients

AQUA / WATER / EAU • COCOS NUCIFERA OIL / COCONUT OIL • AMODIMETHICONE • POLYQUATERNIUM-37 • PHENOXYETHANOL • PROPYLENE GLYCOL DICAPRYLATE/DICAPRATE • SODIUM HYDROXIDE • TOCOPHEROL • DIMETHICONE PEG-7 PHOSPHATE • PPG-1 TRIDECETH-6 • TETRAMETHYL ACETYLOCTAHYDRONAPHTHALENES • TRIDECETH-6 • BEHENTRIMONIUM CHLORIDE • SODIUM HYALURONATE • XYLOSE • ETHYLHEXYLGLYCERIN • CARVONE • CITRUS AURANTIUM PEEL OIL • LIMONENE • LINALYL ACETATE • ACRYLATES/STEARYL METHACRYLATE COPOLYMER • LINALOOL • SORBITAN OLEATE • ISOPROPYL ALCOHOL • CETRIMONIUM CHLORIDE • HYDROLYZED VEGETABLE PROTEIN PG-PROPYL SILANETRIOL • GERANIOL • ASCORBYL GLUCOSIDE • CITRIC ACID • PINENE • GERANYL ACETATE • CITRUS AURANTIUM BERGAMIA PEEL OIL • EDTA • CITRAL • TERPINEOL • CAMPHOR • ROSE KETONES • SODIUM BENZOATE • POTASSIUM SORBATE • PARFUM / FRAGRANCE