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Super Leakproof® No-Show Bikini - Original - Sale
Flash Sale ⚡️
Super Leakproof® No-Show Bikini - Original - Sale
$20.30
USD
$29.00
30% off
Absorbs about 4 super tampons
Invisible under clothes
Extended gusset for extra protection
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.
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Comfort-First Fit
Classic mid-rise silhouette with provides medium hip and bum coverage.
Worry-Free Protection
Patented bonded edges help prevent side leaks.
Moderate Absorbency
Absorbs 4 super tampons worth of liquid—perfect for heavy flow days, overnight protection, and light bladder leaks.
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 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
Explore Best-Sellers
Shop All Total 5 star reviews: 2.3k Total 4 star reviews: 365 Total 3 star reviews: 140 Total 2 star reviews: 90 Total 1 star reviews: 89
What our customers are saying
Generated by AI from 100 most recent customer reviews
Last updated 1 month ago
Customers say these period underwear are comfortable and feel like regular underwear, with many praising their leak protection and confidence-boosting qualities. Users appreciate the no-show design under clothing and find them effective for both period protection and light bladder leaks. Many reviews mention the bikini cut runs small, with several customers recommending sizing up for a better fit. Some note the underwear can feel tight around the waist or create visible lines under certain clothing. While most find them durable and long-lasting, a few mention issues with the newer versions feeling stiffer or having ridges where seams meet. Overall, customers value the comfort and protection these provide as an alternative to disposable products.
92%would recommend these products
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Purchased Knix Size - Letter Sizing
2,969 reviews
- Rated 3 out of 5 stars4 days agoBit of a fail…
Bought the moderate absorbency and wore it on my first full day of my period with a regular tampon. Granted my flow is a bit heavier, but it still leaked outside the liner after 3 hours :/ Will give points to the thinness of the undies and they are stretchy. Small fits fine for 133 lbs.
Cvg05Verified ReviewerReviewingSuper Leakproof® No-Show Bikini - Rated 4 out of 5 stars1 week agoSolid Protection
Long time lover of Knix and these ones are great - I'm still lead to believe they have changed the fabric slightly as it's not as soft as my other pairs but the colour is great, the protection is perfect and they're comfortable!
CASSANDRA D.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars1 week agoBest
Best best best. Sheets will
Never again be stained at night!
rachel f.Verified BuyerReviewingSuper Leakproof® No-Show Bikini 3-Pack - Rated 3 out of 5 stars1 week agoUncomfortable
The no show was a bit smaller than the cotton. It was not comfortable for me. I exchanged them for the cotton bikini.
felis R.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars1 week agoComfy!
These are more comfortable than I expected and I’ve had zero leaks. Would definitely recommend!
Marissa G.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 2 out of 5 stars2 weeks agoDisapointed - Buyers Beware the Extra Gusset Length
I recently replaced my leakproof underwear with heavy Super Leakproof No-Show bikini underwear. Im very disappointed with the new underwear I received. I was under the impression that I was buying the same underwear I bought a couple of years ago. Upon wearing the first new pair, the extra inches of gusset in the back is incredibly irritating and ended up halfway up my butt cheeks and is visible through my pants. I’m so incredibly disappointed, especially since the price of these underwear aren’t cheap. I can’t stand the feel of these new undies’ gusset riding so high and can’t see myself wearing those for a whole week every month. I bought 6 new pairs of the same size and just want my old ones back. If only the extra gusset length was optional.
JenniferVerified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars2 weeks agoGreat fit
These did a great job to add to this ladies undergarment needs.
Tamara C.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars2 weeks agoNo lines
Love the no line underwear. They comfortable as well.
Shelby K.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars2 weeks agoOverall great
The quality is fantastic, it fits perfectly and it's super comfortable, probably the most comfortable underwear I own. I was nervous of how effective period underwear was, but they actually work great. It's super absorbable with no leaks, so I can sleep worry free. These are awesome for even my most heaviest days, so if you have a really heavy period, these are definitely worth checking out. Overall, I'm super happy with them.
clarissa l.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars2 weeks agoWear them with confidence!
As I'm in my 60s, leaky issues have made it hard for me to go out and really enjoy myself at parties, dancing, even just errands. It takes much of the fun out of life.
But I am so grateful to have found these! They fit perfectly and give me the added confidence I need to go out and focus on friends and whatever we're doing instead of worrying!
Mary J. S.Verified BuyerReviewingSuper Leakproof® No-Show Bikini - Rated 5 out of 5 stars2 weeks agoIt is so comfy to feel safe!
Very comfortable and true to size. I have been using Knix period underwear for years, they are definitely worth it.
Nadia C.Verified BuyerReviewingSuper Leakproof® No-Show Bikini 3-Pack - Rated 5 out of 5 stars2 weeks agoDoes the job
Fits great and very comfortable on period days
Christine M.Verified BuyerReviewingSuper Leakproof® No-Show Bikini 3-Pack