Stephen Knoll Deep Renew Treatment Mask, 260g

(1) W High-Penetration Capsule system repairs deep damage and locks in moisture from within the hair shaft
(2) Targets all 6 key damage types — colour, perm, heat, bleach, UV, and daily brushing wear
(3) Rich, rinse-out formula that leaves hair noticeably smoother and shinier — results that last beyond wash day

Most in-shower hair masks work on the surface — they coat the outer cuticle enough to make hair feel better for a day or two, then the effect wears off. The Stephen Knoll Deep Renew Treatment Mask takes the concept further. It's built around what the brand calls a W High-Penetration Capsule system: one capsule focused on structural repair deep inside the hair shaft, the other on sealing in water to maintain that softness after the mask is rinsed out. Alongside these, the formula carries Ceramide NG and NP for cuticle integrity, Argan oil, Camellia oil, and Jojoba oil for surface nourishment, and cholesterol and phytosterols — lipids that closely mirror the hair's own natural structure — to help damaged areas behave more like healthy hair again. The texture is a rich, glossy cream — dense enough to feel deliberate when you work it through, but it rinses out cleanly without leaving a weighted feel. Reviewers consistently note that the hair continues to feel different three days later, not just immediately after drying. A KOSÉ brand, sold exclusively in Japan, and a quiet favourite among those who colour or bleach regularly. The scent is an aromatic floral-woody blend — peach and pear open it, floral muguet and lavender follow, and soft cedarwood and musk close it out.

(1) Ceramide NG & Ceramide NP: help restore the lipid layer between hair cuticles, reducing porosity and surface roughness
(2) Argan Oil (Argania Spinosa Kernel Oil): nourishes the hair surface with fatty acids, adding softness and a visible shine
(3) Camellia Seed Oil (Tsubaki): a traditional Japanese hair oil that smooths the cuticle and improves finger-through feel
(4) Jojoba Seed Oil: a lightweight conditioning oil that balances moisture without heaviness
(5) Cholesterol & Phytosterols: lipid components that mimic the hair's natural structure, helping damaged areas bond and behave more cohesively

Water, Glycerin, Dimethicone, Propylene Glycol, Cetearyl Alcohol, Isopropyl Myristate, DPG, Behenyl Alcohol, Behentrimonium Chloride, Dipentaerythrityl Hexahydroxystearate/Hexastearate/Hexrosinate, Argania Spinosa Kernel Oil, Glycine, Tremella Fuciformis Extract, Camellia Sinensis Seed Oil, Tocopherol, Hydroxypropyltrimonium Hyaluronate, Jojoba Seed Oil, Butylene Glycol, Disodium EDTA, Amodimethicone, Isostearic Acid, Isopropyl Alcohol, Ethanol, Ethyl Olivate, Sodium Citrate, Cholesterol, Neopentyl Glycol Dicaprate, Dicocoyl Ethyl Hydroxyethylmonium Methosulfate, Dicocodimonium Chloride, Steartrimonium Chloride, Ceteth-20, Ceramide NG, Ceramide NP, Palmitic Acid, Phytosterols, Diisostearyl Malate, Hydrogenated Palm Oil, Hydrogenated Polyisobutene, Hydrogenated Coconut Oil, Phenoxyethanol, Methylparaben, Fragrance, Caramel

After shampooing, squeeze excess water from the hair — the mask works best on damp rather than dripping-wet hair. Take approximately a ping-pong ball sized amount (adjust for hair length and density) and spread evenly through mid-lengths to ends, avoiding the scalp. Use fingers to work the cream through section by section, ensuring full coverage from mid-shaft to tip. Leave for 3–5 minutes, then rinse thoroughly until completely clear. For a more intensive treatment, mix in 1–2 pumps of the Stephen Knoll Deep Renew Booster Oil before applying. Follow with a leave-in or hair oil on dry hair if needed.

Q: How often should I use the Stephen Knoll Deep Renew Treatment Mask?
A: Once to twice per week is the recommended frequency. It is a concentrated repair mask rather than an everyday conditioner, so it is most effective used as a targeted weekly treatment rather than a daily step. Hair that is severely damaged may benefit from twice-weekly use until condition improves.
Q: Can I use the Stephen Knoll Deep Renew Treatment Mask with the Deep Renew Booster Oil?
A: Yes — and this is a specific usage method Stephen Knoll recommends. Mix 1–2 pumps of the Deep Renew Booster Oil directly into a ping-pong ball-sized amount of the mask before applying to hair. This combination delivers enhanced repair and adds extra nourishment in one step. Alternatively, you can apply the mask first, rinse, then apply the oil to wet ends and rinse again for a slightly different finish.
Q: Is the Stephen Knoll Deep Renew Treatment Mask suitable for fine or low-porosity hair?
A: The mask has a rich, dense texture that is best suited to medium to coarse, damaged, or high-porosity hair. Those with fine or naturally healthy hair may find it heavier than needed for regular use. A smaller amount used on the mid-lengths and ends only — avoiding the roots — can help prevent any flattening effect on finer hair types.
Q: What does the Stephen Knoll Deep Renew Treatment Mask smell like?
A: It carries the brand's signature aromatic floral-woody fragrance — fruit-forward opening with peach and pear, a floral heart of muguet and lavender, and a warm base of cedarwood and musk. It is a noticeably pleasant in-shower scent that reviewers frequently mention as one of the highlights of using the product.
Q: How is the Stephen Knoll Deep Renew Treatment Mask different from the Stephen Knoll line's regular Hair Packs?
A: The Deep Renew Treatment Mask is the highest-concentration repair product in the Stephen Knoll in-shower lineup. It contains the brand's W High-Penetration Capsule system at its maximum dosage within the range, targeting the deepest level of structural damage. The regular Hair Pack range (Moisture Control, Colour Control, Repair Control, Form Control) are targeted to specific hair concerns — moisture, colour care, repair, frizz control — and are designed for more regular weekly-to-daily use. The Deep Renew Mask is the intensive rescue step.