Flexible Duo
Flexible Duo shampoo 250 ml & serum 100 ml MARTINSSON KING
Flexible Duo shampoo 250 ml & serum 100 ml MARTINSSON KING
shampoo 250 ml & serum 100 ml
550.00 SEK500.00 SEK


Even fine hair needs a moisture boost sometimes, especially when your hair is flat and colour treated. Hydrating Infusion serum blends perfectly to restore flexibility and bounce to dry hair without losing the volume at the roots where you need it.


Suitable forfine, flat, oily root or dry ends.

Deep and gentle cleanse: Create a fresh and lasting feeling. Perfect for finer, thinner hair types and scalps that can easily get greasy.

Instant moisture and flexibility: Get healthy bounce and lustre in all hair types with this unique dual-function serum.

Feel your hair coming back to life: Give energy and youthful bounce to tired hair.

Weightless hydration: Boost the natural health and moisture of your hair without weighing it down. 

Create the perfect result for you: You can also blend a few drops of this serum with the shampoo, in the palm of your hand, to make it even more moisturising.


✔ Made in Sweden. 

✔ 100% vegan, sustainable ingredients.

✔ Recommended by Green Salon™️.

✔ 5x climate compensated through Carbon Footprint.

✔ 30 day change/refund guarantee.



Simply add a pump or two of the serum and blend it together with the shampoo in the palm of your hand before applying. Alternativly, you can add a few pumps of serum into your hair after washing and leave it in for blowdrying. 


Uniquely blended from pure ingredients for Martinsson King in Grasse (France), our signature fragrance evokes the essence of sophisticated freshness that lingers lightly throughout the day, without interfering with your own scent.
Top notes: pink pepper / ginger / cardamom 
Middle notes: cedar wood / violet 
Base notes: white sandalwood / vanilla / frankincense

Essential Cleanse Shampoo

Cocamidopropyl BetaineCleansing & conditioning agent made from coconut oil.
Sodium Lauryl SulfoacetateA cleansing agent derived from coconut oil.
Sodium Lauroyl SarcosinateCleansing and foaming agent that enhances the suppleness and sheen.
GlycerinA naturally sourced moisturiser for hair and scalp.
Coco-GlucosideNatural cleansing agent derived from coconut oil and fruit sugar.
Decyl GlucosideMild, plant-derived cleansing agent.
Acrylates CopolymerA stabiliser/thickener for viscosity.
Glycol DistearateNaturally occurring fatty acid to enhance the product texture.
Tetrasodium Glutamate DiacetateNaturally derived, improves the efficacy of preservatives and antioxidants.
Polyacrylamidopropyltrimonium ChlorideA conditioning polymer.
Polyquaternium-113Shields colour-treated hair for long lasting colour retention.
Sodium ChlorideSalt
Sodium BenzoateCommon eco-preservative.
Citric AcidNatural preservative.
Potassium HydroxideSurfactant to help wash away excess oil and dirt from the skin.
Cetrimonium ChlorideAnti-static ammonium salts

Hydrating Infusion serum

GlycerinNaturally sourced moisturiser for hair and scalp.
Sodium PCANaturally occurring humectant derivative of amino acids.
Polyacrylamidopropyltrimonium ChlorideSubstantive and durable conditioning polymer.
HydroxyethylcellulosePlant-derived amino acid used as a preservative.
PanthenolMoisture molecules that penetrate hair shaft and binds moisture from within.
Polysorbate 20Emulsifier, stabiliser of fragrance.
Citric AcidCitrate salt
Tetrasodium Glutamate DiacetateNaturally-derived, improves the efficacy of preservatives and antioxidants.
Sodium BenzoateCommon preservative to use for eco products.


Essential Rinse conditioner conditioner 250 ml (8.4 fl.oz) MARTINSSON KING
275.00 SEK
JBF Volume dry finishing spray spray 300 ml (10.1 fl.oz) MARTINSSON KING
275.00 SEK220.00 SEK
Volume Infusion serum serum 100 ml (3.4 fl.oz) MARTINSSON KING
275.00 SEK

Customer Reviews

Based on 455 reviews
Linn J.
Duon för torrt och slitet vinterhår!

Perfekt för torrt, frissigt och slitet hår! Kombinerar produkterna med Hydrating infusion serum och mitt hår både känns och ser mer hälsosamt ut!

Annika Sjödin
Schampo & balsam

Så bra för mitt tjocka o gråa hår.

Ulla Carlsson

Kanonbra ! Har blivit av med min klåda i hårbotten! Håret känns så rent och ger volym

Ger fukt utan att tynga ner

Bra balsam som återfuktar bra utan att håret känns tunt och stripigt och utan att tynga ner. Gillar skarpt hur superrent och luftigt håret känns! Köper bara Martinsson King till håret sedan en tid tillbaka och trivs jättebra med det.

Tack Camilla, jättekul att höra! :)

Margareta Ernevad
Perfekt för fnissig hår

Har använt produkter från Martinsson King i ett år nu och har varit supernöjd. Testade denna serie nu i vinter då jag märkte att mitt hår blivit så statiskt. Och vips blev det mycket bättre.

Hej Margareta!
Så bra att du gjorde ett säsongsbyte. Torrt vinterhår behöver lite mer fukt och då är Vital-serien perfekt.