Most mousses build volume through polymer hold — they coat the hair shaft and set the style in place, creating the impression of thickness through structure. REF Stockholm Fiber Mousse N°345 works differently: it contains actual heat-activated fibers that, when warmed between the palms and then activated by blow-dryer heat, physically increase the apparent thickness of each hair strand from root to tip. Not hold alone, but genuine fiber-based body. Fuller, thicker-looking hair at the source of the problem — the strand itself — rather than the styling step.

Fiber Mousse N°345 is built around Polyquaternium-68 — a unique heat-activatable cationic polymer that is the ingredient behind the formula's defining "fiber" characteristic. Polyquaternium-68 is derived from hydroxyethylcellulose and carries a quaternary ammonium charge. At room temperature it behaves as a conditioning film-former; when warmed by hand contact and then further activated by blow-dryer heat, the polymer's molecular structure changes conformation — the chains extend and interlock to create a fibrous, three-dimensional matrix around each hair strand that physically increases its apparent diameter and adds tactile thickness. This is the mechanism behind REF Stockholm's instruction to activate the fibers by warming the product in the hands before application: the heat is not just for dispensing — it initiates the transformation that makes the product work.

The result is hair that feels genuinely fuller and thicker during and after blow-drying, not just held in a volumised position. The fiber matrix adds body from root to tip with a workable texture that remains pliable rather than stiff, because the fiber structure flexes rather than rigidly holding.

Polyquaternium-11 provides the formula's complementary conditioning, anti-static, and additional body-building properties — a classic cationic polymer that coats the hair surface to reduce static charge, increase volume appearance, and improve combability during blow-drying.

PEG-90M is a very high-molecular-weight polyethylene glycol that contributes to the mousse's structure at low concentration — providing thickening and additional film-forming stability that helps the formula dispense as a consistent, soft mousse rather than a wet or runny foam.

Argania Spinosa (Argan) Kernel Oil provides the formula's emollient conditioning — the ingredient that prevents the fiber and polymer system from leaving hair dry or brittle. Argan oil's oleic and linoleic acid content deposits on the hair shaft, maintaining softness and shine through the volume-building step. Helianthus Annuus (Sunflower) Seed Extract provides UV and antioxidant protection. Chenopodium Quinoa Seed Extract delivers the REF Stockholm care signature protein and amino acid support. Quaternium-95 provides additional anti-static conditioning. Panthenol (provitamin B5) penetrates the cortex and binds moisture structurally. Glycerin and Butylene Glycol provide humectant moisture balance.

Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate is the formula's antioxidant stabiliser, protecting both the formula's actives and the hair's proteins. The REF Colour Preserve System protects colour vibrancy through repeated use.

Fragrance: fresh citrus-lemon opening with warm woody-musky base notes — a clean, distinctive scent consistent with REF Stockholm's styling range.

100% vegan. Cruelty-free. Colour-safe. Paraben-free. Sulfate-free. Gluten-free.

Metro Vancouver note: Coastal humidity adds atmospheric weight to fine and limp hair through the day, accelerating the volume loss that blow-dried styles experience. The Polyquaternium-68 fiber matrix creates body from within the hair strand rather than purely from the hold layer, making the volume more resistant to humidity-driven flatness than standard polymer-hold mousses — the fibers maintain their apparent thickness regardless of atmospheric moisture.

Who It's For All hair types — particularly fine, thin, or limp hair seeking genuine volume and thickness from root to tip. Works on medium and thick hair for enhanced body and workable texture. The non-sticky, non-crunchy finish makes it suitable for everyday use. Apply to damp hair and blow-dry for maximum fiber activation and volume — the heat activation step is essential for full performance.

Key Ingredients

• Polyquaternium-68 — Heat-activatable cationic fiber polymer; creates a fibrous three-dimensional matrix around each hair strand when warmed, physically increasing apparent hair diameter and adding body from root to tip
• Polyquaternium-11 — Conditioning body-building polymer; reduces static, improves combability, and adds to the volume effect
• PEG-90M — High-molecular-weight film-forming thickener; contributes to the formula's consistent soft mousse texture
• Argania Spinosa (Argan) Kernel Oil — Emollient conditioning; prevents the fiber system from drying out the hair shaft and maintains softness and shine
• Chenopodium Quinoa Seed Extract — REF Stockholm care signature; protein and amino acid reinforcement at the hair surface
• Panthenol (Provitamin B5) — Penetrates the cortex and binds moisture structurally; maintains elasticity through repeated styling
• Helianthus Annuus (Sunflower) Seed Extract — UV and antioxidant protection

How to Use Step 1 — Activate the fibers: Dispense the desired amount into the palm of your hand. Rub hands together firmly for 3–5 seconds to warm the product — you will feel the texture become slightly more fibrous as the Polyquaternium-68 activates.

Step 2 — Apply to damp hair: Distribute evenly from roots through lengths.

Step 3 — Blow-dry: Use a blow-dryer to fully activate the fibers and enhance body and volume. For fine hair: use a round brush for maximum lift at the root. For medium to thick hair: dry with a diffuser or free-form blow-dry for full-bodied texture.

Air-drying is also an option for a softer result, though blow-drying activates the fibers more completely and delivers greater volume.