
| Item Form | Gel |
| Benefits | Smudge-proof, Intensely pigmented, Long-lasting |
The MUA Gel Eyeliner in Underground is an intensely pigmented black gel liner perfect for creating a classic cat eye. With a unique brush applicator cleverly hidden in the lid, it glides on effortlessly and dries to a smudge-proof finish.
How it helps
- ✔ Intense Black Pigmentation: deeply saturated formula delivers opaque, dramatic colour in a single stroke
- ✔ Built-In Brush Applicator: the unique brush hidden in the lid allows for precise application of any liner style
- ✔ Smudge-Proof Finish: once dry, the gel formula sets firmly for long-lasting, smear-resistant wear
- ✔ Versatile Application: create thin lines, bold wings, or dramatic cat-eye effects with ease
- ✔ Quick-Dry Formula: sets in seconds for a clean, confident liner look
Cyclopentasiloxane, C30-45 Alkyl Dimethicone, Dimethicone, Dimethiconol / Silsesquioxane Copolymer, Trimethylsiloxysilicate, Cetearyl Dimethicone Crosspolymer, Caprylyl Glycol, Mica, Iron Oxides (CI 77491, CI 77492, CI 77499), Titanium Dioxide (CI 77891), Blue 1 Lake (CI 42090), Yellow 5 Lake (CI 19140)
- 01Open the lid to reveal the built-in brush applicator — no separate brush needed.
- 02Starting from the inner corner, draw along the upper lash line in a single fluid stroke for a clean, precise line.
- 03For a winged look, extend the liner past the outer corner and flick upward — steady hand optional, confidence mandatory.
- 04Allow to dry completely before opening your eyes wide for a smudge-proof finish.


