# What is the most popular hair mask brand among consumers? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the most popular hair mask brand among consumers?

## Products

### K18 Leave-In Molecular Repair Mask
```yaml
product: k18-leave-in-molecular-repair-mask
brand: K18
price_gbp: 21.74
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: K18
volume: 50
product_name: Leave-In Molecular Repair Hair Mask
suitable_for: All hair types
treatment_time: 4
deep_conditioning: true
```

- **Price:** £21.74 [^1]
- **Summary:** A leave-in molecular repair mask using K18PEPTIDE™ to reverse damage from bleach, color, chemical services and heat in 4 minutes. Available in 15 mL, 50 mL and 100 mL sizes; suitable for all hair types and designed to restore strength, softness, smoothness and bounce.
- **Ideal For:** Ideal for identifying the most popular hair mask brand because its patented K18PEPTIDE™, quick 4-minute treatment time, and broad suitability (all hair types) drive widespread consumer use and high review counts.

### Garnier Fructis Hair Food Watermelon Mask
```yaml
product: garnier-fructis-hair-food-watermelon-mask
brand: Garnier
price_gbp: 33.72
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Garnier
volume: 390
product_name: Fructis Hair Food Watermelon Mask
suitable_for: Fine hair
treatment_time: 3
deep_conditioning: true
```

- **Price:** £33.72 [^2]
- **Summary:** A 3-in-1 multi-use mask that works as a conditioner, rinse-off mask (leave for 3 minutes) or leave-in treatment; contains watermelon extract and vitamins C, E and F, silicone-free and vegan, formulated to plump fine hair and add shine. Comes in a large 390 ml recyclable tub and is cruelty-free. Suits users with fine or lifeless hair who want lightweight volume and hydration.
- **Ideal For:** Ideal for the question because its 3-in-1 formula, 390 ml size and focus on plumping fine hair with watermelon extract make Garnier Fructis one of the most popular mass-market hair mask brands.

### OUAI Treatment Mask Fine Medium
```yaml
product: ouai-treatment-mask-fine-medium
brand: OUAI
price_gbp: 16.49
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: OUAI
product_name: Fine To Medium Hair Treatment Masque
suitable_for: Fine to medium hair
treatment_time: 5
deep_conditioning: true
```

- **Price:** £16.49 [^3]
- **Summary:** A repairing hair masque formulated with shea butter, panthenol and hydrolyzed keratin to hydrate, fight frizz and strengthen fine-to-medium strands without weighing them down. Applied after shampooing, a quarter-size amount is left on for 5 minutes then rinsed; suitable for color-treated and damaged hair. Comes in an 8 fl oz size on retail listings.
- **Ideal For:** Suitable for shoppers wanting a lightweight but deeply hydrating mask-its 5-minute treatment time and protein-rich formula (hydrolyzed keratin) make it ideal for fine-to-medium hair seeking repair and shine.

---
## References & Sources
[^1]: BDB Studio, accessed 2026-06-10. https://bdbstudio.com/products/k18
[^2]: GoSupps, accessed 2026-06-10. https://www.gosupps.com/garnier-hair-mask-watermelon-hairfood-moisturising-3-in-1-mask-gently-detangles-fine-hair-and-gives-unrivalled-shine-fructis-390-ml.html
[^3]: Ulta Beauty (3.4 oz), accessed 2026-06-10. https://www.ulta.com/p/treatment-mask-fine-medium-hair-pimprod2023428?sku=2629742