Join Our Rewards Program
Earn rewards and exclusive member-only benefits for free.
Leakproof UltraThin No-Show Bikini 3-Pack
ACOTAR™ x Knix
Leakproof UltraThin No-Show Bikini 3-Pack
$68.00
CAD
Limited-edition ACOTAR™ x Knix collection
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.
Which COURT are you? TAKE THE QUIZ
Get It Before It's Gone
ACOTAR™ x Knix
Get It Before It's Gone
Rewards Members Earn
68 Points
You May Also Like
Part of the limited-edition ACOTAR™ x Knix Collection
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 your regular underwear.
ACOTAR™ is a trademark of Fireheart Inc. ©2015-2026, Sarah J. Maas.
Zoom
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
ACOTAR™ x Knix Collection
Shop All
ACOTAR™ x Knix
Modal Short Sleeve Top and Pant Set
$130.00
CAD
Color: Velaris Night Sky Limited Edition
ACOTAR™ x Knix
Revolution V-Neck Bra
$68.00
CAD
Buy 2 Bras Get 10% Off
Color: Velaris Night Sky Limited Edition
ACOTAR™ x Knix
Satin Lace Trim Cami & Short Set
$78.00
CAD
Color: Ember Fox Limited Edition
ACOTAR™ x Knix
Super Leakproof® Dream Short™
$42.00
CAD
Buy More, Save More
Color: Velaris Night Sky Limited Edition
ACOTAR™ x KNIX
Choose your Court. Choose your fantasy.
Explore the limited-edition collection of intimates, sleepwear, and apparel inspired by the characters who rule the realm.
The Night Court
The Spring Court
The Summer Court
The Autumn Court
The Fan Court Collection
Shop All
ACOTAR™ x Knix
ACOTAR™ Leakproof Ultrathin No-Show Bikini Box Set
$115.00
CAD
Color: Thorns & Roses/Mist & Fury/Wings & Ruin/Frost & Starlight/Silver Flames Limited Edition
ACOTAR™ x Knix
Cotton Relaxed Graphic T-Shirt
$50.00
CAD
Color: Darling White Limited Edition
ACOTAR™ x Knix
Oversized Graphic T-Shirt
$55.00
CAD
Color: Book Boyfriend Washed Grey Limited Edition
ACOTAR™ x Knix
Graphic Cropped Hoodie
$115.00
CAD
Color: Cursebreaker Ivory Limited Edition
ACOTAR™ x Knix
Graphic Crewneck Sweater
$95.00
CAD
Color: Cursebreaker Black Limited Edition
ACOTAR™ x Knix
Tote Bag
$25.00
CAD
Color: Cursebreaker Ivory Limited Edition
ACOTAR™ x Knix
Crew Embroidery Socks 2-Pack
$25.00
CAD
Color: Rose and Flame Black/White Limited Edition
Recently Viewed
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 5 months 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.
84%would recommend these products
Search
Keywords
Rating
Height
How do you use your Leakproof?
Usual Pant Size
746 reviews
- Rated 5 out of 5 starsYesterdayConfiance total
Culotté extrêmement confortable de très haute qualité confiance absolue contre les fuites . Produit bien pensé fabriqué avec des matériaux de qualité supérieure.
NDNatasha D.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini Black / S - Rated 5 out of 5 stars4 days agoKnix
They are soft and comfortable
CFCathy F.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini Black / L - Rated 5 out of 5 stars1 week agoFeels like standard bikini
The fit and comfort are beyond what I had hoped. I don't feel a difference
TMTanya M.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars1 week ago5 Stars
Tissus agréable et mince
FFranceReviewingLeakproof UltraThin No-Show Bikini 3-Pack Eucalyptus/Rose Quartz/Rosewood / XL - Rated 5 out of 5 stars2 weeks agoSecond skin
I love these underwear! They're smooth and sleek. No pantylines.
MFMalinda F.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini 3-Pack - Rated 5 out of 5 stars2 weeks agoLove. Totally switched over to Knox now.
Love love love these. I’m officially switched over now to Knix underwear.
NRNikki R.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini 3-Pack Mulberry/Pink Party/Wild Iris / L - Rated 5 out of 5 stars3 weeks agoAmazing
Absolutely love these underwear. They are true to size and I bairly notice they are there. Highly recommend.
CSCecily S.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Last Call Indigo / M - Rated 5 out of 5 stars3 weeks agoIndispensable
Flattering fit and reliable protection. Which is saying a lot — even bloated and on my period these undies hold a good silhouette. Nothing like confidence to get you through an otherwise exhausting few days.
CWcynthia w.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini - Rated 5 out of 5 stars3 weeks agoRecent bikini purchase
They run a little small for medium, but overall, really pleased with them.
WCWendy C.Verified BuyerReviewingPOS - Leakproof UltraThin No-Show Bikini (ZSkus) Black with White Polka Dot / M - Rated 5 out of 5 stars3 weeks agoTeen Leakproof Bikinis
I bought these for my teenage granddaughter and she loves them. So comfortable and are perfect for light days.
DDDebbie D.Verified BuyerReviewingLeakproof UltraThin No-Show Bikini 3-Pack Eucalyptus/Rose Quartz/Rosewood / M - Rated 5 out of 5 stars3 weeks ago5 Stars
best underwear ever!!!!
RReneeReviewingLeakproof UltraThin No-Show Bikini Kit* Black with White Polka Dot / L - Rated 5 out of 5 stars3 weeks ago5 Stars
absolutely fantastic!!!! Fits well. I want more
RReneeReviewingLeakproof UltraThin No-Show Bikini Kit*
