A finishing spray that does exactly one thing, done at a professional level: lock in the style with strong hold that feels natural rather than stiff, using a micro diffuser nozzle that delivers the hold resin in an even, controlled mist that doesn't saturate any single section. No conditioning complex, no styling benefits, no multi-tasking — just the hold resin L'Oréal Professionnel has refined for decades, delivered with the precision spray pattern that makes Infinium 4 a staple in salon finishing kits worldwide.

Infinium 4 is an intentionally minimal formula built entirely around hold performance rather than conditioning or treatment benefits.

VA/Crotonates/Vinyl Neodecanoate Copolymer is the hold resin — a professional-grade vinyl copolymer that sets with a firm, shape-memory film around the styled hair. VA/Crotonates copolymers are among the most durable hold resins used in professional hairsprays, creating a film that maintains the style's structural shape through humidity and movement without progressively stiffening or becoming tacky through the day. The film is strong enough to lock the style in place but formulated to retain a natural feel — hair moves with gravity and touch rather than feeling lacquered or cemented.

Alcohol Denat. is the primary carrier solvent — it delivers the hold resin to the hair surface and evaporates rapidly, leaving behind the polymer film without wet or residue. Hydrofluorocarbon 152a and Butane are the propellants — together they provide the pressure behind the micro diffuser nozzle that creates the fine, even mist. Aminomethyl Propanol adjusts the formula's pH to optimise the hold resin's film-forming performance.

The micro diffuser nozzle is L'Oréal Professionnel's own descriptor for the spray mechanism — delivering the hold resin in a fine, controlled mist that distributes evenly across the styled hair without concentrating the product in one spot or creating wet patches. The result is even hold across the full style rather than a heavy deposit over a specific area.

There are no conditioning actives, no moisturisers, and no treatment ingredients in the formula — this is the correct design for a pure finishing spray where adding humectants or conditioning agents would compromise the hold resin's performance and clarity of result.

Metro Vancouver note: Coastal humidity is the primary enemy of finished styles locally. VA/Crotonates hold resins resist atmospheric moisture uptake more effectively than PVP-based hold polymers, maintaining the style shape through the damp conditions that characterise Metro Vancouver's coastal climate through most of the year.

Who It's For All hair types and lengths requiring a strong hold finishing spray with a natural feel. Particularly effective for updos, defined styles, blowouts that need to hold their shape, and any finished look that requires the style to stay exactly as placed without movement or frizz disruption. Apply 10–12 inches from dry hair for instant, even hold.

Key Ingredients

• VA/Crotonates/Vinyl Neodecanoate Copolymer — Professional vinyl hold resin; creates a durable, shape-memory film for strong hold with natural feel; humidity resistant
• Alcohol Denat. — Rapid-evaporating carrier solvent; delivers the hold resin cleanly without residue
• HFC 152a & Butane — Propellant system; powers the micro diffuser nozzle for fine, even mist distribution

How to Use Hold can 10–12 inches from dry, finished hair. Spray evenly in short bursts over the style for instant, controlled hold.