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

L'Oréal Professionnel Pro Longer Mask is a salon-grade length-renewing treatment that thickens fragile ends, reduces the appearance of split ends, and restores softness and shine to fine or thin long hair.

If your long hair looks thin at the tips, this concentrated mask targets weakened lengths with L'Oréal's patented Filler A-100 technology plus amino acids to reinforce and resurface the hair fiber. Designed to be used as a treatment within the Pro Longer routine, it helps fortify strands, minimize breakage, and deliver a smoother, glossier finish without weighing fine hair down.

How does the Pro Longer Mask repair thinning ends?

The mask works by depositing a filling molecule and amino acids along weakened lengths to thicken and rebuild the fiber surface. This creates a fuller-looking tip and reduces the visible signs of split ends after repeated use within the Pro Longer system.

• Patented Filler A-100 helps fill and resurface the hair fiber.
• Amino acids strengthen and fortify the length.
• Formulated for fine and thin hair so it conditions without heaviness.

Will this product reduce split ends and breakage?

When combined with the Pro Longer Shampoo, clinical testing shows a measurable reduction in the appearance of split ends. The mask also helps limit breakage by improving fiber integrity and adding slip to reduce friction during styling and brushing.

• Up to 31% reduction in visible split ends when used with the matching shampoo.
• Deep-conditioning action decreases surface roughness and snapping.
• Use regularly as a targeted treatment to maintain longer hair health.

How should I use the mask for best results?

Apply after shampooing to damp or towel-dried hair, focusing on lengths and ends. Leave the treatment on for 3–5 minutes, then rinse; for an intensive session, substitute for conditioner 1–2 times per week.

• Apply evenly through lengths and ends after cleansing.
• Leave on 3–5 minutes for regular use; extend occasionally for deeper conditioning.
• Pair with Pro Longer Shampoo and Conditioner for optimal results.

Will this weigh down my fine hair?

The formula was developed specifically for fine and thin hair types and aims to thicken the fiber rather than coat it heavily. It delivers moisture and slip while keeping hair light, so volume and movement are preserved.

• Lightweight thickening technology avoids heavy residue.
• Designed to add softness and shine without flattening roots.
• Suitable as a periodic deep treatment or regular mask step.

Who is this for: Pro Longer Mask is made for people with long hair that shows visible thinning at the ends—especially those with fine or thin strands seeking a professional-strength treatment. If you want to reduce the look of split ends, strengthen lengths, and add shine without losing volume, incorporate this mask into a Pro Longer regimen alongside shampoo and conditioner for best outcomes.

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.