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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.
Fantastic! This mascara doesn't clump and is incredibly long wearing!
Holli
Love the mascara! Makes my short thin lashes look much fuller!
Kimberly
- 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.
Build-Your-Own 10-Second Eye Trio 3 Full-Size Gel Watercolor EyeshadowsBuild-Your-Own 10-Second Eye Trio3 Full-Size Gel Watercolor Eyeshadows
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)


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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I have been using this mascara for well over a year+ and absolutely LOVE IT.....I have turned so many people onto it when asked for a recommendation -- I've been in the beauty industry for quite some time and have to say this one is impressive and the fact that it's clean is the cherry 🍒 on top!!
Was this helpful? - FFFAIRON F.Verified BuyerAstrology Water — Cancer; Scorpio; PiscesHair Color BrownSkin Tone MediumSkin Type NormalRecommend Yes -1000%4 weeks agoAstrology Water — Cancer; Scorpio; PiscesHair Color BrownSkin Tone MediumSkin Type NormalRecommend Yes -1000%Rated 5 out of 5 starsI cannot tell a lie…
My eyelashes aren’t long or full. But, then I used Big Clean Mascara and they looked just right! I would have given it 5 stars but the brush wand broke. Kudos to Team Kosas, though, for their rapid response and outstanding customer service.
Was this helpful?KCKosas Cosmetics3 weeks agoWe're so happy we're able to help, Fairon! 💗
- AAshley2 months agoRated 5 out of 5 stars5 Stars
I love this mascara!
Was this helpful? - LLINDA3 months agoRated 5 out of 5 stars5 Stars
Love it 😍
Was this helpful? - HHaleyVerified BuyerAge Range 25 - 34Astrology Air — Gemini; Libra; AquariusHair Color BlackSkin Tone MediumSkin Type CombinationRecommend Yes -1000%3 months agoAge Range 25 - 34Astrology Air — Gemini; Libra; AquariusHair Color BlackSkin Tone MediumSkin Type CombinationRecommend Yes -1000%Rated 5 out of 5 starsLoved it so much I had to have another one!
I fell in love with with mascara and the formula upon purchasing it the charm store. I didn’t try it out for a while as I was working through a couple other brands and I’m so, so sad I waited as long as I did. It’s only been about a month of use and have been hooked since use two! Loved it so much that I don’t want to find myself without it so I got a backup, thank you for being my go to mascara! Volume, length, no clumping, perfect black and separates my lashes like a dream 😊❤️
Was this helpful?KCKosas Cosmetics3 months agoHi Haley! We are so happy you're loving The Big Clean! It looks stunning on you 💖