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Leakproof UltraThin No-Show Bikini
#1 Daytime Solution
Leakproof UltraThin No-Show Bikini
$27.00
CAD
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.
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Leakproof UltraThin No-Show Bikini
Leakproof UltraThin No-Show Bikini
Leakproof UltraThin No-Show Bikini
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Product Description
Comfort-First Fit
Bikini silhouette with a classic mid-rise fit, medium hip and 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 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: 558 Total 4 star reviews: 77 Total 3 star reviews: 49 Total 2 star reviews: 32 Total 1 star reviews: 46
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 2 weeks ago
Customers say these period underwear are comfortable and provide effective protection without the bulk of traditional pads. Many appreciate the soft, buttery fabric that feels like regular underwear and the no-show design under clothing. Users frequently mention confidence during workouts, daily activities, and even swimming. Parents often purchase these for teenage daughters who love the comfort and security they provide. Common feedback includes praise for the absorbency and leak-proof performance. However, several reviews mention sizing inconsistencies, with some finding recent purchases run smaller than previous orders. A few customers note the leg holes can feel tight or that the fit varies between different fabric types.
85%would recommend these products
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762 reviews
- Rated 5 out of 5 stars14 hours agoSuch a relief!
These are the best undies to not worry about any leakage or sweat! I feel dry and comfortable all day!
Carol W.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini 3-Pack - Rated 5 out of 5 stars16 hours agoSave money on tampons!
This is my first time trying period underwear, and I'm a big fan! These are comfortable, reasonably priced, and the absorbency is as listed. I got the size small and they fit just fine. The only thing I'd say is that they are not truly "no-show" under tighter fitting pants as the gusset extends fairly far back. But that doesn't detract from my five stars!
Jessica M.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars19 hours agoComfy and effective
Really appreciate that these don’t make me feel like I am wearing a diaper. They’re great!
Elissa M.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 starsYesterdayVery comfortable
Very comfortable. Just what I needed.
Anna G.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars2 days agoBikini underwear
I love them. They are so comfortable. I will diffently be buying for product from you.
Victoria W.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars2 days agoLove them!!!
These panties are perfect for me and anyone that has ever had to deal with the situation I have leaking in my panties
Deborah P.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars3 days agoComfie
Bought these to match bra. Comfortable and true to size
Sandra J.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars4 days agoHappy with purchase
Comfy and cute!
Heather R.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Last Call - Rated 5 out of 5 stars5 days agoSleek!
My girls LOVE these no-show undies! They like the feel and that they aren't bulky at all. They work well and keep my girls feeling confident and comfortable.
Julie D.Verified BuyerReviewingTeen Leakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars6 days agoVery comfortable
I have been excited to try ever since the birds papaya shared these. They are even better than I thought they’d be!
Catie S. J.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars6 days agoGreat for autistic tween
These are great for a child with special needs who gets overwhelmed with period products.
Kelly B.Verified BuyerReviewingTeen Leakproof UltraThin No-Show Bikini 3-Pack - Rated 5 out of 5 stars1 week agoBetter than I expected
Can't wait to order more. I have tried a couple other "period panties" and these by Knix arw by far the best!
Amanda F.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini
