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Clean Longwear Mascara
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Longwear Formula,Big Fluffy Lashes
A clean mascara for instantly big, fluffy lashes powered by hair care serum that helps support stronger, healthier lashes. Newly reformulated to wear for 12 hours.
Clinically tested. Ophthalmology tested. Safe for sensitive eyes. Non-irritating. Hypoallergenic.
- Castor Oil
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Helps lashes reach full growth potential
- Provitamin B5
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Helps revive lashes
- Biotinoyl Tripeptide-1
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Supports healthier, fuller hair
- Plant-Based Sugars
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Provides longwear without microplastics
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Press the brush into the base of your lashes and wiggle it upward, with the curve of the brush following the natural curve of your eye.
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For more natural-looking volume, apply one coat. For a more dramatic effect, wait 30 seconds and apply another coat.
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Pairs well with 10-Second Eyeshadow for a quick, easy, full eye look.
The Big Clean is not waterproof, but is clinically proven to wear for 12 hours.
It’s a weightless, creamy texture for optimal pairing with a twisted wire brush.
This multi-benefit mascara promotes length, volume, and curl to the lashes.
Natural body-building ingredients including botanical waxes allow this mascara to be super volumizing, and a combination of emulsifiers help make it creamy and clump-free.
The best way to use The Big Clean is to press the brush into the base of your lashes and wiggle it through, with the curve of the brush following the natural curve of your eye.
This is clean mascara like you’ve never seen before. The Big Clean instantly delivers big, bold lashes without commonly used acrylates, carbon black, mineral oil, fragrance or silicones. It’s also powered by haircare actives so lashes can reach their full growth potential. It’s like lash extensions and lash serum in a bottle.
87% did not experience smudging
Long wearing for 12 hours
100% saw longer, thicker, lusher lashes*
*Based on a consumer study with 33 women after using The Big Clean for 2 weeks
Clinically tested. Ophthalmology tested.
Safe for sensitive eyes. Non-irritating. Hypoallergenic.
Beauty Innovator Awards, Refinery29 (2020)
Pairs Best With
100% Saw Longer, Thicker, Lusher Lashes
Get max volume and separation with the cleanest ingredients. Biodegradable plant-based sugars replace traditionally used microplastics for a longwearing formula + big, fluffy, lash-extension impact.




Big Lash Energy
Natural body-building ingredients and pure, intense pigments deliver a big lash vibe. The oversized curved brush (like a rainbow) has flexible-yet-firm spiraled bristles that volumize, lengthen, separate, and curl lashes all the way up.
Powerful Hair Care Serum For Clinically Proven Results
The active formula nourishes and protects to support stronger, healthier lashes over time. Every swipe helps lash hairs reach their full growth potential.


See It In Action
A few before & afters of The Big Clean. Your lashes, but bigger.





Kosas Clean
Cruelty-free and gluten-free. Formulated without: carbon black, acrylates, mineral oil, talc, silicones, fragrance, parabens, sulfates, and phthalates.
Check out our Kosas Clean page for the full list.


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Received this mascara as part of my “try the website” box and loved how full it made my eyelashes look. It stayed on really well. I traveled for 7 hours the day I tried it and it looked great the entire time. It washed off fairly easy and didn’t leave black streaks across my face like other mascaras do when removing.
Was this helpful? - TSTracey S.Verified BuyerAge Range 35 - 44Astrology Fire — Aries; Leo; SagittariusHair Color BrownSkin Tone FairSkin Type DryRecommend Yes -1000%1 week agoAge Range 35 - 44Astrology Fire — Aries; Leo; SagittariusHair Color BrownSkin Tone FairSkin Type DryRecommend Yes -1000%Rated 5 out of 5 starsLove this mascara!
I read that this has been reformulated, but I am new to Kosas so I can’t speak to that. What I can say is this wand and this formula are so easy to use and make my lashes perfectly separated and gorgeous! I have short straight lashes, but this makes them look long and lifted. Works as well as Ilia, but I like this wand better for sure. Easily washes off, no fallout, and no clumps. You can really build it, but I use just one coat and am ready to go.
Was this helpful? - KSKrista S.Verified BuyerAge Range 45 - 54Hair Color BrownSkin Tone LightSkin Type OilyRecommend Yes -1000%1 month agoAge Range 45 - 54Hair Color BrownSkin Tone LightSkin Type OilyRecommend Yes -1000%Rated 5 out of 5 starsLove the formula
I really like this formula! Have already noticed a difference in my eyelashes growing in thicker after just using this for a few weeks.
Was this helpful? - KCKimberly C.Verified BuyerAge Range 35 - 44Hair Color BrownRecommend Yes -1000%1 month agoAge Range 35 - 44Hair Color BrownRecommend Yes -1000%Rated 5 out of 5 starsLove the mascara
Love it. Doesn’t clump and barely transfers. I have Asian eyes that are oily and mascara always ends up everywhere around my my eyes. So I’m happy that this one barely transfers.
Was this helpful? - CGCarmin G.Verified BuyerAge Range 25 - 34Hair Color BrownSkin Tone MediumSkin Type CombinationRecommend Yes -1000%2 months agoAge Range 25 - 34Hair Color BrownSkin Tone MediumSkin Type CombinationRecommend Yes -1000%Rated 5 out of 5 starsPerfect
This has a really good balance between wet and dry…I curl my eyelashes and this goes on smooth, but not super wet, so it holds things up well. This is my third bottle and I’m pretty sold.
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