Front view of Garnier Fructis Sleek & Stay Heat-Activated Serum bottle.Front view of Garnier Fructis Sleek & Stay Heat-Activated Serum bottle.Front view of Garnier Fructis Sleek & Stay Heat-Activated Serum bottle. Before and after use of Sleek & Shine system.Before and after use of Sleek & Shine system.Before and after use of Sleek & Shine system. Garnier Fructis Sleek & Stay Heat-Activated Serum bottles highlighting benefits: water-resistant, heat protection up to 450°F, non-greasy.Garnier Fructis Sleek & Stay Heat-Activated Serum bottles highlighting benefits: water-resistant, heat protection up to 450°F, non-greasy.Garnier Fructis Sleek & Stay Heat-Activated Serum bottles highlighting benefits: water-resistant, heat protection up to 450°F, non-greasy. Step-by-step instructions for using Garnier Fructis Sleek & Stay Heat-Activated Serum.Step-by-step instructions for using Garnier Fructis Sleek & Stay Heat-Activated Serum.Step-by-step instructions for using Garnier Fructis Sleek & Stay Heat-Activated Serum. Garnier Fructis Sleek & Shine routine with shampoo, conditioner, and heat-activated serum.Garnier Fructis Sleek & Shine routine with shampoo, conditioner, and heat-activated serum.Garnier Fructis Sleek & Shine routine with shampoo, conditioner, and heat-activated serum. Two women with ultra glassy, sleek hair, showing results that last up to 5 washes.Two women with ultra glassy, sleek hair, showing results that last up to 5 washes.Two women with ultra glassy, sleek hair, showing results that last up to 5 washes. Full Garnier Fructis Sleek & Shine product line: shampoo, conditioner, anti-frizz serum, and heat-activated serum.Full Garnier Fructis Sleek & Shine product line: shampoo, conditioner, anti-frizz serum, and heat-activated serum.Full Garnier Fructis Sleek & Shine product line: shampoo, conditioner, anti-frizz serum, and heat-activated serum. Green capsule with Argan Oil and Vegan Keratin ingredients labeled.Green capsule with Argan Oil and Vegan Keratin ingredients labeled.Green capsule with Argan Oil and Vegan Keratin ingredients labeled. Garnier "Greener Beauty" commitments: Cruelty-Free, Vegan Formula, 100% Recycled Plastic bottle.Garnier "Greener Beauty" commitments: Cruelty-Free, Vegan Formula, 100% Recycled Plastic bottle.Garnier "Greener Beauty" commitments: Cruelty-Free, Vegan Formula, 100% Recycled Plastic bottle. Back of Garnier Fructis Sleek & Stay Heat-Activated Serum bottle with product details and ingredients.Back of Garnier Fructis Sleek & Stay Heat-Activated Serum bottle with product details and ingredients.Back of Garnier Fructis Sleek & Stay Heat-Activated Serum bottle with product details and ingredients. ;

Garnier Fructis Sleek & Stay Heat-Activated Serum

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Experience long-lasting smoothness with Garnier Fructis Sleek & Shine Sleek & Stay Serum, a heat-activated serum that delivers up to 5 washes of frizz control when used with the Sleek & Shine system.

Advanced Smoothing Formula. This hair smoothing serum helps tame frizz and boost shine, working as a lightweight leave-in treatment for sleek, polished hair.

Heat-Activated Technology. Designed as a smoothing hair treatment, the formula activates with heat to create a water-resistant shield and making it an effective frizz control hair treatment for all-day smoothness.

Frizz-Free, Sleek Results. Sleek & Stay smoothing serum for frizzy hair helps keep styles smoother and shinier, supporting a long-lasting, frizz-free finish.
size

$9.99 MSRP

Where to buy

Product Information

Get smooth, sleek results with Garnier Fructis Sleek and Stay Serum, a heat-activated serum that helps deliver up to 5 washes of frizz control and high shine*. Infused with alpha-silanes, this Fructis Sleek and Stay formula provides heat protection up to 450°F for long-lasting smoothness.

• Smoothing Hair Treatment: This lightweight hair smoothing serum helps tame frizz, boost shine, and give an ultra-glassy sleek finish. This smoothing serum for frizzy hair forms a humidity-resistant barrier to keep styles sleek and controlled.
• Frizz Control & Heat Protection: Designed as a frizz free hair treatment, the serum helps keep hair smooth during heat styling while maintaining a polished, frizz-resistant finish.

Formulated without parabens, phthalates, or DMDM hydantoin, absorbing quickly to leave hair soft, shiny, and easy to style. 100% recycled plastic bottle excluding cap.

For the best sleek results, use the full Sleek & Shine system of shampoo, conditioner, and anti-frizz serum.

All Garnier products are approved by Cruelty Free International under the Leaping Bunny Program.

*when used in the shampoo, conditioner, and Sleek & Stay system

Benefits

• Helps deliver long-lasting smoothness and up to 5 washes of frizz control* for hair that stays sleek.
• Supports smoother-looking hair over time by helping reduce frizz and resist humidity, keeping styles polished*.
• Powered by heat-activated alpha-silanes that help create a lightweight, water-resistant shield for lasting shine and smoothness.
• Provides up to 450°F heat protection to help defend hair during blow-drying and flat-ironing while supporting a sleek, frizz-free finish.

*when used in the shampoo, conditioner, and Sleek & Stay system

Key Features

• Product Type: Serum
• Size: 1.69 fl oz
• Packaging: Bottle & Lotion Pump
• Product dimensions: 4.449 x 1.575 x 1.575 inches
• Product form: Liquid
• Hair type: Coily & dry
• Key ingredients: Pro Alpha-Silane, Argan Oil, Vegan Keratin
• Performance: Anti-Frizz, Ultra Shine, Sleek Protection, Humidity Resistance
• Formulation: Vegan and free of parabens, phthalates, and DMDM hydantoin
• Cruelty free: Approved by Cruelty Free International under the Leaping Bunny Program
• Sustainability: Bottle made from 100 percent recycled plastic (excluding cap)

Instructions of Use

After washing with Sleek & Shine Shampoo and Conditioner, prepare hair for styling with the Garnier Sleek & Stay hair smoothing serum.

Step 1: Shake & Apply
Shake well, then apply the heat-activated serum to damp hair, distributing evenly from mid-lengths to ends.

Step 2: Leave In
Do not rinse. Allow this Garnier Fructis leave-in treatment to coat strands for smoother, shinier hair.

Step 3: Activate With Heat
Blow-dry thoroughly, then flat-iron to seal in sleekness and enhance this frizz-free hair treatment.

Ingredients

DIMETHICONE, BIS-(MORPHOLINOMETHYL C1-4 DIALKOXYSILOXY) DIMETHICONE, BIS-CETEARYL AMODIMETHICONE, PARFUM / FRAGRANCE

Learn More About Sleek & Stay

Before and after of female model using Sleek & Shine Sleek & Stay leave-in serum

Get Frizz-Free High Shine Up to 5 Washes

Garnier Fructis leave-in treatment helps provide frizz-free, shiny hair from the first use when used as part of the Sleek & Shine system with shampoo and conditioner.

  • Heat-activated protective serum.
  • Up to 5 washes of anti-frizz power*.
  • Heat protection up to 450°F.
  • Long-lasting shine and sleekness.


*when used in the shampoo, conditioner, and Sleek & Stay system

Hair Smoothing Serum with Pro Alpha-Silane Shine Effect

Sleek & Stay Serum is infused with alpha-silane for long-lasting sleek and scientifically tested to control frizz with patented water-resistant technology. The heat activated serum’s unique formula also includes argan oil and vegan keratin to deliver smooth, soft hair.

Argan Oil + Vegan Keratin
Group shot of Sleek & Shine entire collection in front of a green background.

Sleek & Shine Hair Care & Styling Products for Shinier Hair

Check out the rest of the Sleek & Shine hair care and styling collection to complete your regimen.

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How to Use the Complete Sleek & Shine System

The back of a person's head and shoulders in a shower, with hands vigorously shampooing dark, lathered hair under a stream of water.

Step 1: Cleanse with Sleek & Shine Shampoo

Massage into wet hair and scalp, working into a rich lather from roots to ends. Rinse thoroughly.

Go to product

Step 2: Condition with Sleek & Shine Conditioner

Apply evenly through mid-lengths to ends to help soften and detangle. Rinse out completely.

Go to product
A blurred image of a person pouring white shampoo from a yellow-capped bottle into their hand in a shower.
A hand with light-colored fingernails running through wet, dark hair.

Step 3: Smooth with Sleek & Stay Serum

On damp hair, apply the Garnier Sleek and Stay hair smoothing serum, shaking before each use. Distribute evenly from mid-lengths to ends. Do not rinse.

Step 4: Activate & Style

Blow-dry thoroughly to activate this frizz free hair treatment, then flat-iron to seal in sleekness and help lock in style for smooth, shiny, frizz-controlled results.

Pro Tips
• Focus conditioner and serum on mid-lengths and ends to avoid weighing hair down at the roots.
• For extra control on very frizzy or textured hair, pair Sleek & Stay with Sleek & Shine Anti-Frizz Serum.

A close-up of a flat iron straightening a section of brown hair with blonde highlights.

Discover The Fructis Sleek & Shine Collection

Elevate your hair care with the full Sleek & Shine regimen. Powered by argan oil and vegan keratin, each formula targets frizz in its own unique way, whether you’re cleansing, conditioning, smoothing, or finishing your style. Mix, match, and layer products for sleek, hydrated, high-shine hair from root to tip.

A Garnier Sleek & Shine shampoo bottle dispensing out product.

Sleek & Shine Smoothing Shampoo

  • Made for Frizzy, Dry Hair: Specifically formulated as a shampoo with keratin and argan oil, it tames stubborn frizz while enhancing natural shine and manageability.
  • Preps for Sleek Styling: Leaves hair clean, soft, and primed for frizz control when paired with the system.
  • Long-Lasting Sleekness: Achieve up to 3 days of smooth results when used with Sleek & Shine system.

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Sleek & Shine Smoothing Conditioner

  • Deep Conditioning Formula: Powered by sustainably sourced argan oil and vegan keratin, Sleek & Shine Conditioner smooths each strand while restoring shine and strength.
  • Lightweight Smoothing Action: A creamy, argan-oil-rich conditioner that helps detangle, soften, and replenish moisture without weighing hair down.
  • Humidity-Resistant Finish: Helps deliver up to 72 hours of smooth, manageable hair, even in 97% humidity when paired with the Sleek & Shine system.

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One bottle of shampoo (right) and conditioner (left) from the Garnier Sleek & Shine collection.
A bottle of Garnier Sleek & Shine anti-frizz serum dispensing product. This serum creates a protective barrier to block humidity and keep your hair sleek and polished.

Sleek & Shine Anti-Frizz Serum

  • High-Shine, High-Smooth Serum: Concentrated argan oil and vegan keratin work instantly to smooth frizz and strengthen hair.
  • Clinically Proven Frizz Defense: Helps deliver up to 72 hours of sleek, frizz-controlled hair in 97% humidity.
  • Protective Humidity Shield: Forms a lightweight barrier that tames flyaways and leaves hair looking polished and refined.

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Sleek & Shine Frizz Tamer

  • Instant Flyaway Fix: Perfect for touch-ups, this portable serum smooths baby hairs, edges, and frizz with a transparent, non-sticky finish.
  • 12-Hour Soft Shine: Infused with plant keratin and argan oil to hydrate, add shine, and control frizz throughout the day.
  • Clean & Cruelty-Free: Enjoy a silicone-free, phthalate-free, and mineral oil-free formula. Officially approved by Cruelty Free International under the Leaping Bunny Program.

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A woman with black hair with a braided hair style and a woman with blonde hair in a pony tail with un-frizzed hair.
A bottle of Garnier 10-in-1 leave-in spray misting in the air. This product provides reduced flyaways, boosted shine, visible damage reduction and nourishment in one-non greasy formula.

Sleek & Shine 10-in-1 Leave-In Spray

  • Multi-Benefit Care: A lightweight spray offering 10 benefits including smoothing, heat protection (up to 450°F), shine enhancement, detangling, and visible damage repair.
  • Streamlined Styling: Reduces flyaways and nourishes dry, frizzy hair while keeping strands soft, conditioned, and never greasy.
  • Routine Simplifying: Cuts your hair care and styling routine into just one simple step with a clean, cruelty-free formula with no weigh down.

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Hair Care Routine Quiz

Hair Care Routine Quiz

Discover your personalized Garnier hair care regimen.

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Fructis Sleek & Shine FAQs

  • Sleek & Stay is a heat-activated smoothing serum that helps control frizz for up to 5 washes, boosts shine, and leaves hair feeling sleek and polished. It’s designed to be used with heat styling for best results.
  • Shake well before use. Apply to damp hair after washing with Sleek & Shine Shampoo and Conditioner. Do not rinse. Blow-dry thoroughly, then use a flat iron to help activate the formula and lock in sleekness.
  • Garnier Sleek & Stay serum is formulated for use on damp hair as part of the Garnier Sleek & Shine system, along with Sleek & Shine shampoo and conditioner. Since it is heat-activated, you'll achieve the best results using a blow dryer and a flat iron. However, it can be used on dry hair for touch-ups.
  • Sleek & Shine is recommended for hair that needs frizz control and shine. This is usually chronically dry hair or hair going through a dry spell due to environmental factors, age, or seasonal changes.
  • Yes! Garnier Sleek & Stay smoothing treatment provides heat protection up to 450°F. Plus, it’s activated by heat so you can use your hair dryer and hot tools without causing damage, and the results will be lasting shine and no frizz.
  • The amount of Sleek & Shine smoothing hair serum you use depends on how much hair you have. Apply one pump at a time and evenly distribute with a wide-toothed comb between each pump until your hair is well saturated.
  • While both help fight frizz, Sleek & Stay is heat-activated and designed to deliver smoothness that lasts up to 5 washes when used with the Sleek & Shine Shampoo and Conditioner. The Anti-Frizz Serum provides immediate shine and humidity protection but is not heat-activated or long-wear.
  • Yes. Heat activates the serum’s smoothing technology. Blow-drying and flat-ironing help create a lightweight shield that resists frizz and humidity.
  • No. The formula is lightweight and designed to smooth without heaviness or greasiness. Start with 1–2 pumps and build as needed based on hair density and length.
  • Use Garnier frizz free hair treatment every time you wash and heat-style your hair. Its effects may last through multiple washes, depending on your hair type and routine.
  • Yes. The formula is safe for color-treated hair and helps protect against heat-related damage that can dull hair color.

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