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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
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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: 453 Total 4 star reviews: 71 Total 3 star reviews: 40 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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How do you use your Leakproof?
Usual Pant Size
617 reviews
- Rated 5 out of 5 stars23 seconds agoComfortable and fit well
I like the material, they stay in place and dont ride up on me. Plus theyre lightweight. Only issue is they CANNOT be placed in the dryer. The glue will release all the seams and the absorbent pad.
LaRay C.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 3 out of 5 stars19 hours agoI don’t really understand these 2 boxes so I’ll say good title of underwear?
Here I’ll say the underwear is nice, nice fabric, lovely colours but being a petite person I find the gusset/padding is too long, goes up my behind & kind of bunches up.
Did not have a leak when I wore it so can’t review that.
Lastly was told you can simply throw in washing machine but then I read you have to either hand wash or use gentle cycle, needs mild soap, no fabric softener & no dryer - lay flat to dry. This is way more than just “throwing in washer”.
Not sure if I’ll purchase more.
Anna C. D.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars3 days agoThe best
Fit great, are perfect for those leaks, keep me dry
KKnix3 days agoHey Pam!
Thanks so much for taking the time to review our Leakproof UltraThin No-Show French Cut! We're so happy to hear they're keeping you dry and comfortable!
Team Knix
Pam C.Verified BuyerReviewingLeakproof UltraThin No-Show French Cut - Rated 5 out of 5 stars1 week agoSuper absorbante
Je suis favorablement étonnée du niveau d'absorption de cette culotte qui est somme toute mince et très confortable
KKnix1 week 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 stars1 week 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!
KKnix1 week 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 stars1 week 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.
KKnix1 week 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 stars2 weeks 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
KKnix2 weeks 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 stars2 weeks agoComfortable
It feels like your second skin.
KKnix2 weeks 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 stars2 weeks agoI trust them
They fit great, they wash great, they wear great but best of all no more smell!!
KKnix2 weeks 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
