Thru Line Waterproof Eyeliner

100%said it applies comfortably to lash line + waterline*

98%said it’s blendable + easy to control*

96%said it wears comfortably all day**

90%said it doesn't skip, drag, or tug*

In a consumer perception study of 50 people; immediate results (*) and after 12 hours (**).

Omega Fatty Acids

Help support comfortable wear—even on the waterline.

Avocado Oil-Coated Pigments

Combine bold color with smooth, buttery glide.

Color Lock Film Formers

Lock in long-lasting + waterproof wear.

The Art of the Eye

Pair Thru Line with Eye Stylus and Limitless Lash for an artful look.

Paint

Prime your canvas with an all-over wash of Eye Stylus Shadow Stick.

Sketch

Line and define lids with a swipe of Thru Line Waterproof Eyeliner.

Frame

Frame your work of art with lengthening, lifting Limitless Lash Mascara.

Why We Love It

Rich, saturated color that glides smoothly and stays all day—even on sensitive eyes and the waterline.

Founder's Note

— Sasha

How to keep your empty packaging out of the landfill.

The outer carton is curbside-recyclable—drop it in your curbside bin.
Once you’re done with the pencil, discard any shavings or remnants.
Send the cap and base to Pact. Drop in your nearest collection bin, or download your free shipping label once you collect 10 empties.

Yes, Thru Line Waterproof Eyeliner is ophthalmologist-tested and safe for the waterline and sensitive eyes. The pigments are coated in avocado oil, so they glide on smoothly without dragging or tugging the delicate skin along the lash line and waterline. It applies comfortably whether you’re tightlining the upper lash line or lining the inner rim, and it stays put once it sets.

Thru Line is longwear waterproof eyeliner with up to 24-hour wear. Once it sets, the formula is smudge-resistant, transfer-resistant, sweatproof, and humidity-proof. It works well for sensitive eyes, hooded lids, or anyone whose liner tends to fade, smudge, or transfer. Apply and blend any soft or smoked-out looks quickly—after the formula sets, it locks into place for the full wear time.

Yes! Hooded eyes are one of the trickiest shapes for liner because the lid folds down and makes contact throughout the day, which causes most pencils to transfer and smudge. Thru Line is a smudge-resistant, transfer-resistant waterproof eyeliner pencil, so it stays exactly where it is applied. It’s the perfect everyday option for hooded, mature, or deep-set eyes, where long wear matters most.

Thru Line works with most eyeliner application techniques. You can tightline along the upper lash line for subtle definition, line the waterline for depth, draw a thin, precise line for a clean look, or blend it out for a smoky effect. Work quickly on any blended or smudged-out styles—the formula locks in for 24-hour wear once it sets.

Thru Line is formulated with sensitive eyes in mind, not just color. Avocado Oil-Coated Pigments and Omega Fatty Acids give the formula its smooth, tug-free glide for comfortable wear, even on the waterline. It’s also vegan, cruelty-free, and formulated without fragrance, gluten, or talc.

Thru Line comes in 10 shades in matte and shimmer finishes, so you can design everything from a natural daytime look to a lived-in smoky eye. The matte shades are perfect for clean, precise lines and tightlining, while the shimmer shades add subtle dimension along the lash line or inner corner. With shades that ranged from nuanced neutrals to rich jewel tones, there’s a color for most looks, skin tones, and preferences. Every shade is waterproof and safe for sensitive eyes.

Some waterproof eyeliner pencils trade comfort for performance, so they end up dragging, tugging, or irritating sensitive eyes. Thru Line is designed to do both. It combines up to 24-hour wear with an ophthalmologist-tested formula that’s safe for sensitive eyes and the waterline. The pigments are coated in avocado oil for smooth, non-irritating glide, and omega fatty acids help support comfortable wear on even the most delicate skin. The result is a long-wear, smudge-resistant, transfer-resistant liner that feels comfortable to wear.

4.8

Rated 4.8 out of 5 stars

Based on 47 reviews

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47 reviews

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Grace
I recommend this product
Skin Type Dry
Skin Tone Neutral
Undertone Neutral
Eye Color Brown
Age Range 25-34
Reviewed by An incentivized reviewer
Reviewed By An incentivized reviewer
Rated 5 out of 5 stars
7/21/26
Great product
It’s great quality. I would recommend this product.
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Ankita
I recommend this product
Skin Type Normal
Skin Tone Warm
Undertone Warm
Eye Color Brown
Age Range 25-34
Reviewed by An incentivized reviewer
Reviewed By An incentivized reviewer
Thru Line Waterproof Eyeliner Dash
Rated 4 out of 5 stars
7/21/26
Fun Switch-up From My Usual Routine.
I have used the same eyeliner as my daily eyeliner for 5+ years, but I received this Thru Line Eyeliner in the shade Dash as a free sample and I'm glad to have it as an option for special days! The blue/green color makes my brown eyes pop and it is so smoooooth to apply. I'm more used to liquid liner so I don't love that the tip of this isn't perfectly sharp and I have to use other tools to perfect my wing, but the color, application, and the way it lasts through the day make up for that.
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Sita S.
I recommend this product
Skin Type Combination
Skin Tone Warm
Undertone Warm
Eye Color Brown
Age Range 18-24
Reviewed by An incentivized reviewer
Reviewed By An incentivized reviewer
Thru Line Waterproof Eyeliner Gesture
Rated 5 out of 5 stars
7/21/26
Smooth, Long-Lasting Liner That Stays Put
This ILIA Thru Line Waterproof Eyeliner in the shade Gesture has quickly become my go-to for effortless definition. The pencil glides on incredibly smooth without tugging at my lash line, and the color is rich and buildable for both subtle and more dramatic looks. I was genuinely impressed that it stayed almost perfectly intact through a full workday and even held up during a humid afternoon walk. It doesn't smudge or flake, yet it removes easily with my regular cleanser when I'm ready to take it off. I received this product for free, and I'm sharing my honest experience—this is a reliable, high-performing liner that I would definitely purchase again.
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Christina M.
I recommend this product
Skin Type Normal
Skin Tone Neutral
Undertone Cool
Eye Color Brown
Age Range 35-44
Reviewed by An incentivized reviewer
Reviewed By An incentivized reviewer
Thru Line Waterproof Eyeliner Trace
Rated 5 out of 5 stars
7/21/26
Nice waterproof eyeliner
This goes on very easy and smooth. It dries and definitely is waterproof. I love the color and I already bought more of them. Comes off with makeup remover. Very good product. I recommend it
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Erika
Verified Reviewer
I recommend this product
Skin Type Dry
Skin Tone Neutral
Undertone Neutral
Eye Color Blue
Age Range 45-54
Reviewed by An incentivized reviewer
Reviewed By An incentivized reviewer
Thru Line Waterproof Eyeliner Gesture
Rated 4 out of 5 stars
7/21/26
Super Smooth and Lasting
I really like this eyeliner for its feel and its staying power. The color was nice too. I used it to tightline, and i did have to go over the line a few times to get a dark line. Its almost too smooth. I do recommend it but if i wanted a super dramatic thicker line, i may use a different option
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Thru Line Waterproof Eyeliner is a waterproof eyeliner with up to 24-hour wear that’s ophthalmologist-tested and safe for sensitive eyes and the waterline. The formula is smudge-resistant, transfer-resistant, and sweatproof, with Avocado Oil-Coated Pigments that glide on without dragging or tugging. Omega Fatty Acids help support comfortable wear, even on the delicate waterline. Available in 10 shades with matte and shimmer finishes. Vegan, cruelty-free, and formulated without fragrance or gluten. Pair it with Eye Stylus Shadow Stick, Limitless Lash Mascara, or explore the full ILIA eye collection.