Product Price Product Name Brand Volume (ml) Treatment Time (minutes) Deep Conditioning Suitable For
K18 Leave-In Molecular Repair Mask
US
£21.74 Leave-In Molecular Repair Hair Mask K18 50 4 All hair types

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
US
£33.72 Fructis Hair Food Watermelon Mask Garnier 390 3 Fine hair

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
US
£16.49 Fine To Medium Hair Treatment Masque OUAI 5 Fine to medium hair

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.