Garnier Keratin Sleek Mask
3 Days Frizz Free
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Keratin Sleek Keratin Sleek Mask

4.6892
4.6892 out of 5 stars based on reviews
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For frizz-prone and dry hair, achieve a long-lasting sleek look with the Garnier Keratin Sleek range. This Keratin Sleek Hair Mask is an intensive treatment powered by a 13% Keratin Smoothing Complex and nourishing Argan Oil. This rich, frizz-free formula works to intensely smooth the hair fibre from root to tip, providing frizz control while boosting shine and leaving hair feeling up to 10 times smoother*. Use this mask as part of the complete Keratin Sleek System. After cleansing with the Shampoo, apply this mask 1-2 times a week in place of the Conditioner for a deep treatment that leaves hair intensely smooth and shiny, before finishing with the Diamond Sleek Shine-Coat Smoothing Spray for a long-lasting sleek look with diamond-like shine. Vegan Formula**. Approved by Cruelty-Free International.
 

*Instrumental test after application of standard shampoo + mask
**No animal-derived ingredients or by-products
*** Instrumental test after use of shampoo + conditioner + mask as a leave on 

For frizz-prone and dry hair, achieve a long-lasting sleek look with the Garnier Keratin Sleek range. This Keratin Sleek Hair Mask is an intensive treatment powered by a 13% Keratin Smoothing Complex and nourishing Argan Oil. This rich, frizz-free formula works to intensely smooth the hair fibre from root to tip, providing frizz control while boosting shine and leaving hair feeling up to 10 times smoother*. Use this mask as part of the complete Keratin Sleek System. After cleansing with the Shampoo, apply this mask 1-2 times a week in place of the Conditioner for a deep treatment that leaves hair intensely smooth and shiny, before finishing with the Diamond Sleek Shine-Coat Smoothing Spray for a long-lasting sleek look with diamond-like shine. Vegan Formula**. Approved by Cruelty-Free International.

*Instrumental test after application of standard shampoo + mask
**No animal-derived ingredients or by-products
*** Instrumental test after use of shampoo + conditioner + mask as a leave on 

Up to 10x Smoother Hair: This intensive hair mask treatment will leave your hair feeling incredibly soft, manageable, and up to 10 times smoother* to the touch

Frizz-Free Hair: The rich formula intensely smooths the hair fibre from root to tips, providing frizz control and boosting shine

Up to 3 Days of Sleek & Shine: When used as part of the Keratin Sleek system, this mask helps to deliver a super sleek and shiny hair look that lasts for up to three days***

Keratin & Argan Oil: Powered by a 13% Keratin Smoothing Complex and Argan Oil, this hair mask actively smooths the hair fibre for sleek and shiny locks

Vegan Formula: A vegan formula**, approved by Cruelty Free International

After shampooing with Keratin Sleek Shampoo, apply the hair mask generously to wet hair, focusing on lengths and ends. Leave on for 3-5 minutes, then rinse thoroughly. Use 1-2 times a week. For best results, follow with Diamond Sleek Shine-Coat Smoothing Spray.

Key Ingredient

Garnier Color Match logo

Argan

Used for centuries in skincare and haircare, argan oil is an extremely rich golden liquid which is quickly absorbed. This transformative ingredient unleashes nourishment, fatty acids, and vitamin E, soothing and deeply hydrating the skin, and restoring shine to dull hair.

Know more

AQUA / WATER, CETEARYL ALCOHOL, STEARAMIDOPROPYL DIMETHYLAMINE, ISOPROPYL MYRISTATE, CETYL ESTERS, HELIANTHUS ANNUUS SEED OIL / SUNFLOWER SEED OIL, BUTYROSPERMUM PARKII BUTTER / SHEA BUTTER, ARGANIA SPINOSA KERNEL OIL, HYDROLYZED CORN PROTEIN, HYDROLYZED SOY PROTEIN, HYDROLYZED WHEAT PROTEIN, CAPRYLYL GLYCOL, CITRIC ACID, TARTARIC ACID, PHENOXYETHANOL, BENZOIC ACID, LINALOOL, GERANYL ACETATE, AMYL CINNAMAL, HEXYL CINNAMAL, BENZYL ALCOHOL, PARFUM / FRAGRANCE.


*Please be aware that ingredient lists for products in our brand are updated regularly. Please refer to the ingredient list on the product package for the most up-to-date list of ingredients to ensure it is suitable for your personal use.

Curl It. Sleek It. Switch It.

Curl It. Sleek It. Switch It.

Garnier Keratin Sleek Shampoo
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FAQs

How often should I use the Garnier Keratin Sleek Hair Mask for a deep smoothing treatment?
The Garnier Keratin Sleek Hair Mask is designed as a deep treatment, recommended for use 1-2 times a week for frizz-prone and dry hair. To achieve the best results, apply this rich, frizz-free formula after cleansing with the Keratin Sleek Shampoo, using it in place of your regular conditioner. This mask works to deeply smooth the hair fiber from root to tip, providing frizz control and boosting shine. It helps leave hair feeling up to 10 times smoother*, contributing to a super sleek and shiny look that can last for up to three days**.

*Instrumental test after application of standard shampoo + mask
** Instrumental test after use of shampoo + conditioner + mask as a leave on

What makes the Garnier Keratin Sleek Hair Mask leave hair up to 10 times smoother?
The Garnier Keratin Sleek Hair Mask is formulated with a powerful 13% Keratin Smoothing Complex and nourishing Argan Oil, which work together to provide profound smoothing benefits. This rich, frizz-free formula deeply penetrates to smooth the hair fiber from root to tip, offering significant frizz control and boosting shine. The result is hair that feels up to 10 times smoother*, making it more manageable and contributing to a super sleek and shiny appearance. This claim is supported by instrumental tests after application of standard shampoo + mask.

*Instrumental test after application of standard shampoo + mask

How long can I expect the sleek and shiny results to last after using the Garnier Keratin Sleek Hair Mask?
When used as part of the complete Keratin Sleek System, the Garnier Keratin Sleek Hair Mask helps deliver a super sleek and shiny hair look that lasts for up to three days*. This deep treatment, powered by a 13% Keratin Smoothing Complex and nourishing Argan Oil, works to deeply smooth the hair fiber and provide frizz control. By incorporating this mask 1-2 times a week in place of your conditioner, you can help maintain long-lasting sleekness and brilliant shine for frizz-prone and dry hair.

* Instrumental test after use of shampoo + conditioner + mask as a leave on

How does the Garnier Keratin Sleek Hair Mask differ from the conditioner in the range?
The Garnier Keratin Sleek Hair Mask offers a more profound level of smoothing and frizz control compared to the conditioner, functioning as a deep treatment. It features a higher concentration of active ingredients, with a 13% Keratin Smoothing Complex (compared to the conditioner's 10%). This rich formula works to deeply smooth the hair fiber from root to tip, leaving hair feeling up to 10 times smoother*. It is recommended for use 1-2 times a week in place of the conditioner for a targeted treatment, whereas the conditioner is for daily use to detangle and soften.

*Instrumental test after application of standard shampoo + mask

Is the Garnier Keratin Sleek Hair Mask a vegan and cruelty-free product?
Yes, the Garnier Keratin Sleek Hair Mask is a conscious beauty choice, featuring a vegan formula*. This means it is formulated without any animal-derived ingredients or by-products. Additionally, Garnier is officially approved by Cruelty Free International under the Leaping Bunny Programme. As the largest beauty brand worldwide with this approval, Garnier adheres to strict global no-animal-testing standards, ensuring ethical product development and allowing you to make a conscious choice for your hair care.

*No animal-derived ingredients or by-products

Reviews

Rating Snapshot

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117 reviews with 5 stars.
19 reviews with 4 stars.
10 reviews with 3 stars.
1 review with 2 stars.
1 review with 1 star.

Overall Rating

4.7
131 out of 136 (96%) reviewers recommend this product

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    Filter Reviews

    1 to 8 of 148 Reviews
    1 – 8 of 148 Reviews
    Review1
    Votes0

    terrible, burns skin

    2 months ago
    gave me burns/reactions on my face that itch and sting. didn’t really do anything for my hair but soften it a bit

    No, I do not recommend this product.

    Originally posted on boots.com

    Northamptonshire
    Reviews41
    Votes0

    Love the mask

    4 months ago
    I love using keratin sleek mask after I used the shampoo and conditioner from the same range because my hair shines and is sleek for longer time. It does hydrate the hair and make it look healthier than before

    Yes, I recommend this product.

    Helpful?
    Reviews15
    Votes0

    Little bit hwavy for fine hair

    4 months ago
    Ok so I'm very skeptical about putting masks on my hair as its so fine. But this wasn't bad! The smell is amazing but it is a little too heavy for my hair. I will use again but only once a month, maybe.
    Helpful?
    Reviews31
    Votes0

    Smells lovely

    4 months ago
    I’ve been using this range for the past few weeks and it’s okay. It smells lovely and is great at detangling. However, i haven’t noticed any difference with the smoothness of my hair, it is hydrating though. I will continue to use the product but i am unsure if i would repurchase, if i did it would be for the detangling side of things rather than smoothing.

    Yes, I recommend this product.

    Helpful?
    South Yorkshire
    Reviews28
    Votes0

    Works well

    4 months ago
    This mask is great. I use it alongside the matching shampoo in the Keratin Sleek hair range. I have tick, wavy-curly hair, and this mask leaves my hair feeling soft, silky and manageable. I will leave it on for around 5-10 minutes for it to get to work and then rinse off. I really like the ingredients of keratin and argan oil, as they really moisturise the hair. In my opinion, this is worth checking out if you have a frizzy or unmanageable hair type.

    Yes, I recommend this product.

    Helpful?
    Burton, West Midlands
    Reviews20
    Votes0

    Keratin sleek mask

    4 months ago
    I used the mask once every two washes with the keratin sleek shampoo and spray. It smells lovely with a fresh, fruity fragrance and is a nice thick consistency. The ends of my hair still felt a little dry so I may need to leave the mask on for longer, but my hair still looked good after styling.

    Yes, I recommend this product.

    Helpful?
    Northwich/Cheshire
    Reviews27
    Votes0

    Amazing hair mask

    4 months ago
    I'm loving this range and this mask is amazing. I can't believe how smooth and frizz free my hair is after using this along with the shampoo and conditioner. It's so quick and easy to use and smells lovely. Will definitely recommend this.

    Yes, I recommend this product.

    Helpful?
    Norfolk
    Reviews54
    Votes12

    Lovely moisture

    4 months ago
    Great hair mask. Easy to open lid, even with wet hands. I applied the product on the mid and ends of hair and left on for 5-10minuites and used once a week as a mask treatment. The product left my hair soft and shiny, without being greasy. Only thing that can be improved is the fragrence. It doesnt smell of anything.

    Yes, I recommend this product.

    Helpful?
    1 – 8 of 148 Reviews
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