Flexible Duo shampoo 250 ml & serum 100 ml MARTINSSON KING
Flexible Duo shampoo 250 ml & serum 100 ml MARTINSSON KING

Flexible Duo

shampoo 250 ml & serum 100 ml
550.00 SEK 350.00 SEK SAVE 36%


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 Betaine
Cleansing & conditioning agent made from coconut oil.

Sodium Lauryl Sulfoacetate
A cleansing agent derived from coconut oil.

Sodium Lauroyl Sarcosinate
Cleansing and foaming agent that enhances the suppleness and sheen.

A naturally sourced moisturiser for hair and scalp.

Natural cleansing agent derived from coconut oil and fruit sugar.

Decyl Glucoside
Mild, plant-derived cleansing agent.

Acrylates Copolymer
A stabiliser/thickener for viscosity.

Glycol Distearate
Naturally occurring fatty acid to enhance the product texture.

Tetrasodium Glutamate Diacetate
Naturally derived, improves the efficacy of preservatives and antioxidants.

Polyacrylamidopropyltrimonium Chloride
A conditioning polymer.

Shields colour-treated hair for long lasting colour retention.

Sodium Chloride

Sodium Benzoate
Common eco-preservative.

Citric Acid
Natural preservative.

Potassium Hydroxide
Surfactant to help wash away excess oil and dirt from the skin.

Cetrimonium Chloride
Anti-static ammonium salts



Hydrating Infusion serum

Naturally sourced moisturiser for hair and scalp.

Sodium PCA
Naturally occurring humectant derivative of amino acids.

Polyacrylamidopropyltrimonium Chloride
Substantive and durable conditioning polymer.

Plant-derived amino acid used as a preservative.

Moisture molecules that penetrate hair shaft and binds moisture from within.

Polysorbate 20
Emulsifier, stabiliser of fragrance.

Citric Acid
Citrate salt

Tetrasodium Glutamate Diacetate
Naturally-derived, improves the efficacy of preservatives and antioxidants.

Sodium Benzoate
Common preservative to use for eco products.



Customer Reviews

Based on 5 reviews

Håret känns rent, smidigt och fylligt. Jag gillar känslan.

Fkexible Duo

Använder den tillsammans med schampot så himla bra resultat, håret trasslar inte o jättebra efterresultat

Tack Christa! Roligt att du kombinerar serum och schampo! :)

Carin Louise Olsen Liljestrand
Hydrating Infusion serum passar mitt hår perfekt!

Bästa schampo och serum ! Mitt hår känns fräscht efter

Tack Carin! ♡
Det är just den fräscha känslan som är vårt viktigaste mål! :)

Funkar bra

Fungerar mycket bra för mig. Håret känns renare längre tid än med många andra schampon

Annika Hagen Grahn
Det bästa

Bästa shampo, balsam och vårdande serum, jag är verkligen nöjd med alla.

Tack Annika, roligt att vi har dig som 'fan'! :)