L'Oréal Professionnel Paris Pro Longer Mask for Thin & Fine Long Hair — Reduces Split Ends, Adds Softness & Shine

This deep-conditioner mask targets long hair with thinned ends by combining a patented filling molecule (Filler A-100) and amino acids to thicken, resurface and strengthen the hair fiber. Designed to be used after shampooing or as a weekly intensive, it works best when paired with the Pro Longer Shampoo and Conditioner for a visible reduction in split ends and improved manageability.

How does this mask reduce the appearance of split ends?

The formula uses Filler A-100, a concentrated filling molecule that helps rebuild and resurface the fiber, while amino acids reinforce weakened areas. Together they smooth rough cuticles and give strands a fuller look, which makes ends appear less frayed and more cohesive.

• Patented Filler A-100 fills and resurface thinned fibers.
• Amino acids strengthen lengths to resist breakage.
• Visible reduction in split-end appearance when used in regimen.

When and how should I use the Pro Longer Mask for best results?

Apply to damp, towel-dried hair after shampooing, focusing on lengths and ends. Leave on for 3–5 minutes for regular use, or apply once or twice weekly as an intensive treatment between conditioner sessions.

• Use after Pro Longer Shampoo for optimal synergy.
• Spread evenly through lengths and ends; do not apply to roots.
• Rinse thoroughly after 3–5 minutes; use weekly for deeper conditioning.

Will this weigh down my fine or thin hair?

The mask is formulated specifically for fine and thin long hair, balancing nourishing agents without heavy buildup. It aims to thicken the fiber at the point of damage rather than saturate the whole strand, leaving hair softer and shinier without feeling greasy.

• Lightweight thickening technology targets thinned ends only.
• Designed for fine and thin hair to add body and manageability.
• Use sparingly at roots to avoid extra weight near the scalp.

How does this mask fit into a complete haircare routine?

Pro Longer Mask performs best as part of the full Pro Longer collection: shampoo, mask, and conditioner working together rebuild fiber and maintain length. Incorporating the mask 1–2 times weekly as an intensive treatment will help maintain long hair and reduce ongoing damage.

• Pair with Pro Longer Shampoo and Conditioner for measurable results.
• Use the mask 1–2× weekly for deep conditioning and repair.
• Regular regimen reduces breakage and preserves length over time.

Who is this for? This mask is tailored for people with long, fine or thin hair who notice thinning at the ends, frequent breakage, or dullness. It suits anyone wanting a salon-grade strengthening treatment to restore smoothness, add shine, and protect lengths while keeping hair light and manageable.

Ingredients

Aqua / Water / Eau, Cetearyl Alcohol, Amodimethicone, Hydroxypropyl Starch Phosphate, Isopropyl Myristate, Behentrimonium Chloride, Phenoxyethanol, Trideceth-5, Isopropyl Alcohol, Trideceth-6, Glycerin, Caprylyl Glycol, Arginine, Panthenol, Trideceth-10, Lactic Acid, Cetrimonium Chloride, Benzyl Salicylate, Benzyl Alcohol, Linalool, Limonene, Acetic Acid, Hydroxycitronellal, Citronellol, Aminopropyl Triethoxysilane, Alpha-isomethyl Ionone, Polyquaternium-6, Parfum / Fragrance. C241158/1.