The K18 So Strong and Clean Set — the full-size Leave-In Molecular Repair Hair Mask paired with AirWash Dry Shampoo, for hair that needs structural repair at the wash and a between-wash refresh that does not undo it. The 50 ml mask is the largest size K18 makes, and this set prices it below buying the two products separately.
This set includes:
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K18 Leave-In Molecular Repair Hair Mask (50 ml) — the four-minute leave-in treatment powered by K18PEPTIDE™, which travels to the cortex and reconnects the broken polypeptide chains that bleach, colour, and heat sever.
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K18 AirWash Dry Shampoo (47 ml) — the residue-free dry shampoo that uses odorBIND™ biotechnology to neutralise odour and translucent microbeads to absorb oil, with no starch, no white cast, and no buildup for up to three days.
The Moda Team Review
This pairing makes sense once you understand what K18 is asking of a client. The Molecular Repair Mask works best when the hair is washed less often — the peptide keeps working in the hair between washes, and every shampoo is a fresh round of stress on a fibre that is trying to rebuild. So the honest question a K18 client asks is: how do I go three days between washes without my roots looking like it? AirWash is K18's answer, and it is a different kind of dry shampoo — no starch to build up on a scalp, no white cast on dark hair, and odour actually neutralised rather than perfumed over.
The mask is the reason to buy the set. Traditional conditioning smooths the outside of the hair; K18PEPTIDE™ is small enough to reach the cortex and reconnect the keratin chains themselves, which is why elasticity comes back rather than just softness. Four minutes on towel-dried hair after shampooing, no conditioner, no rinsing, and the change in how wet hair behaves on a comb is noticeable within a few uses. At 50 ml, this is the largest size — enough for four to six months of the recommended protocol.
The AirWash 47 ml is the travel size, and it earns its place: a wash-stretching partner that keeps the repair working and the roots clean.
Why Moda Carries This
K18 is a biotech haircare brand built on a single foundational technology — the K18PEPTIDE™, a patented bioactive peptide that reconnects broken polypeptide chains inside the hair. It launched as a professional-channel product because the technology requires a precise application protocol to work. We carry K18 as a retail line at Moda because it solves the specific problem of structural hair damage that conditioning products cannot address, and this set is the entry point we recommend for a client whose hair has been through repeated lightening.
Moda Pro Tip
Follow the protocol exactly for the first four to six washes: shampoo, skip conditioner entirely, towel-dry, apply the mask from roots to ends, wait a full four minutes before touching it, then style. The four minutes is not marketing — the peptide needs that time to travel into the cortex, and applying conditioner first blocks it. Once the hair has recovered, you can go back to conditioning and use the mask as maintenance.
Not the Right Fit If...
Not for healthy, virgin hair with no colour or heat history — there are no broken chains to reconnect, and the mask will feel like an expensive leave-in. Not a moisture product: if the hair is dry but not breaking, a hydrating routine will do more, and K18 is the add-on once structure is the issue.
How To Use
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Molecular Repair Mask: Shampoo, skip conditioner, towel-dry. Apply 1–2 pumps from roots to ends. Wait 4 minutes. Do not rinse. Style as usual.
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AirWash: On day two or three, shake and spray at the roots from 15 cm. Massage in. No brushing out required.
