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Leakproof UltraThin No-Show French Cut
Leakproof UltraThin No-Show French Cut
$27.00
USD
Buy 3+ Save 15%, Buy 5+ Save 20%
Absorbs about 2.5 super tampons
Invisible under clothes
Moderate protection without the bulk
Machine washable
Size and Fit Guide
How to Measure
In order to select the correct sizing, we recommend you take the following measurements using a soft tape measure. If necessary, ask someone else to help.
Waist
Measure around the narrowest part of your torso, usually just above your belly button. Keep the tape snug and level, but not tight. The number where it meets is your waist measurement.
Hip
Stand with your feet together and measure around the fullest part of your hips and buttocks. Keep the tape level and snug, but not tight. The number where it meets is your hip measurement.
Build Your 3-Pack
Leakproof UltraThin No-Show French Cut
Leakproof UltraThin No-Show French Cut
Leakproof UltraThin No-Show French Cut
Rewards Members Earn
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Product Description
Comfort-First Fit
A classic mid-rise silhouette that provides medium bum coverage.
Worry-Free Protection
Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.
Moderate Absorbency
Absorbs 2.5 super tampons worth of liquid—perfect for moderate flow days, light bladder leaks, and sweat. The carbon cotton gusset top layer keeps you dry.
No-Show Style
Buttery-soft and smooth fabric gives a seamless look and feel. Disappears under clothes, even leggings.
Easy to Wash
Machine washable, just like your regular underwear.
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How to Choose?
Essential
- • Days you don’t need leak protection. Everyday freshness and moisture wicking.
-
0 tsp
Heavy
- • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
-
about 8-14 tsp
-
about 1.5-3 regular pads
-
about 4-7 super tampons
-
about 1.5-3 menstrual cups
Light
- • Daily freshness. For sweat, discharge, period spotting, or backup protection.
-
about 1-3 tsp
-
about 1-3 pantyliners
-
about 1-3 regular tampons
-
about 0.5 menstrual cups
Moderate
- • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
-
about 4-8 tsp
-
about 1-1.5 regular pads
-
about 2-4 super tampons
-
about 0.5-3 menstrual cups
Ultra
- • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
-
about 15-20 tsp
-
about 1.5-2.5 super pads
-
about 7-11 super tampons
-
about 2-3 menstrual cups
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FRESH FIX TECHNOLOGY®
Built-in protection that feels like nothing at all.
Our patented 360 LeakSeal™ technology locks in leaks at every edge. The ultra-thin liner absorbs about 2.5 super tampons worth of liquid.
Soft Top Layer
Middle Layer
Leakproof Layer
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How to wash
Knix underwear is 100% reusable and machine washable, just like your regular undies.
Not required. But for best results, you can rinse your leakproof with cold water in the tub or sink before washing.
Machine wash on a cold, gentle cycle with mild detergent.
For their longest life, air drying is best. Hang or lay flat to dry.
Fabric softeners, bleach, ironing, or heat from the dryer.
Total 5 star reviews: 451 Total 4 star reviews: 71 Total 3 star reviews: 39 Total 2 star reviews: 17 Total 1 star reviews: 36
What our customers are saying
Generated by AI from 100 most recent customer reviews
Last updated 2 months ago
Customers say these French cut underwear are comfortable, soft, and provide effective protection without visible lines under clothing. Many appreciate the ultra-thin design that feels like regular underwear while offering reliable coverage. Users frequently mention the smooth, satiny feel and no-show appearance. Some find the fit runs small or note that the cut sits higher than expected, particularly in the back. Several customers report issues with the material stretching too much or creating wedging. Common feedback includes praise for the comfortable fit and discreet protection, though some mention concerns about durability and sizing consistency. Many customers become repeat purchasers, finding them ideal for daily wear.
87%would recommend this product
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Usual Pant Size
614 reviews
- Rated 5 out of 5 stars4 days agoSuper absorbante
Je suis favorablement étonnée du niveau d'absorption de cette culotte qui est somme toute mince et très confortable
KKnix4 days agoSalut Geneviève!
Merci beaucoup pour cet avis! Nous sommes si heureuses que tu adores l'absorption et le confort de cette culotte. C'est exactement ce qu'on visait!
Équipe Knix
Genevieve V.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars5 days agoLong time customer
When I found Knix, they had only leakproof/period underwear in 3 absorbancies. Still the only underwear I have. Love the feel,love the no show and, of course, love the "coverage". Fabulous!
KKnix5 days agoHey Patricia!
This is so wonderful to hear! We're beyond grateful for your loyalty and thrilled you're still loving the feel and coverage. Here's to many more years together! 💖
Team Knix
Patricia M.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars5 days agoGreat and soooooo pretty!!!!
I have had lots of the Knix underwear and these are so VERY pretty…..well made….and I like the thinner fabric. I think Knix are the best around.
KKnix5 days agoHey Charlene!
This is so wonderful to hear! We're thrilled you're loving the pretty design and thinner fabric of your new French Cut. Thanks for being such a loyal Knix fan!
Team Knix
Charlene B.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 week agoGreat
Super confortable, je les portes tous les jours!
KKnix1 week agoSalut Stephanie!
Merci beaucoup pour cette belle évaluation! On est si heureuses que tu adores le confort de ton French Cut. C'est fantastique de savoir que tu les portes tous les jours!
Équipe Knix
stephanie p.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 week agoBest Fit
Great for every day wear or for spin class, a run or a heavy workout!
I feel dry and know I am covered for any little leaks
KKnix1 week agoHey Lisa!
We love hearing this! So happy our Leakproof UltraThin No-Show French Cut keeps you feeling dry and confident through every workout. Thanks for sharing!
Team Knix
Lisa M.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 week agoComfortable
It feels like your second skin.
KKnix1 week agoHey Joana!
Thanks so much for taking the time to review our Leakproof UltraThin No-Show French Cut! We're so happy to hear it feels like second skin - that's exactly what we were going for!
Team Knix
Joana M.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 week agoI trust them
They fit great, they wash great, they wear great but best of all no more smell!!
KKnix1 week agoHey Karen!
This is so wonderful to hear! We're thrilled our UltraThin No-Show French Cut has you feeling confident and fresh. Trust is everything to us!
Team Knix
Karen M.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 4 out of 5 stars1 month agoAlway a favourite!
While I really love all my Knix products I find the gusset in this order thicker and more still than usual. I am hoping with wear and washing it will soften up.
KKnix1 month agoHey Susan!
Thanks for the love! We appreciate the feedback about the gusset - it should definitely soften up with a few washes. So happy you're loving your Knix collection!
Team Knix
Susan R.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 3 out of 5 stars1 month agoSometimes leaks
Super comfy but I wish the absorbant part was a bit thicker! I find it someone's leak out the side.
AshlynVerified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 month agoSo comfy
Doesn’t leave any lines in jeans or shorts and had enough coverage to leave me protect feeling protected all day
KKnix1 month agoHey Kaitlyn!
Thanks so much for the amazing review! We're thrilled to hear our UltraThin No-Show French Cut kept you feeling protected and comfortable all day with no lines!
Team Knix
Kaitlyn M.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 month agoVery satisfied
Really like the fit of these, and the level of protection is great against the coughing/sneezing leaks that apparently come with "a certain age".
KKnix1 month agoHey Andie!
Thanks so much for the great review! We're thrilled our UltraThin No-Show French Cut is giving you the perfect fit and protection you need!
Team Knix
Andie Z.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 month agoGreat fit
Lost some weight and needed new undies, these fit the bill perfectly. Nice colours and feel.
KKnix1 month agoHey Susan!
Thanks so much for taking the time to review our Leakproof UltraThin No-Show French Cut! We're so happy to hear you're loving the fit and colours. There's nothing better than hearing our customers feel amazing in their Knix!
Team Knix
Susan F.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut
