Join Our Rewards Program
Earn rewards and exclusive member-only benefits for free.
SuperPlus Leakproof® No-Show Bikini
New Colors
SuperPlus Leakproof® No-Show Bikini
$36.00
CAD
Buy 3+ Save 15%, Buy 5+ Save 20%
Absorbs 7-11 super tampons
Front-to-back liner
Bonded seams prevent leaks
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
SuperPlus Leakproof® No-Show Bikini
SuperPlus Leakproof® No-Show Bikini
SuperPlus Leakproof® No-Show Bikini
Rewards Members Earn
36 Points
You May Also Like
Product Description
Comfort-First Fit
Ultimate Leakproof Protection
Day & Night Comfort
Machine Washable
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
Our Best-Selling Underwear
Shop All
Restocked
Super Leakproof® Dream Boxer™
$48.00
CAD
Buy More, Save More
Color: Blue Stripe
+2
Leakproof UltraThin No-Show High Rise
$32.00
CAD
Buy More, Save More
Color: Warm Sand
+3
Leakproof UltraThin No-Show French Cut
$27.00
CAD
Buy More, Save More
Color: Warm Sand
+2
PATENTED LEAKPROOF TECHNOLOGY
Our longest, most absorbent liner—ever.
Our original Fresh Fix Technology® features a built-in absorbent liner that soaks up about 7–11 super tampons’ worth of liquid—so you stay fresh, comfortable, and in control.
Soft Top Layer
Middle Layer
Leakproof Layer
Bottom Layer
What Our Customers Are Saying
Recently Viewed
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.
82%would recommend these products
Search
Keywords
Rating
Height
How do you use your Leakproof?
Usual Pant Size
91 reviews
- Rated 5 out of 5 starsYesterdayVery comfortable
I wss able to wear all day without any leaks.
RHRobin H.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black / M - Rated 5 out of 5 stars2 days ago5 Stars
These are great and hold a lot
LLuminaryReviewingSuperPlus Leakproof® No-Show Bikini Black / M - Rated 5 out of 5 stars4 days agoConfortable and reliable!
Hands down the most comfortable underwear I have ever owned. The fabric is incredibly soft, flexible and breathable. The design molds perfectly to the body without any bunching, providing completely reliable, leakproof protection that gave me total peace of mind. I absolutely love the quality and fit of the design and highly recommend it!
AWAmy W.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Twilight Navy / S - Rated 5 out of 5 stars1 week agoFit wonderfully,great leak proof design
These are very comfortable and fit great plus they are super leak proof. so far not a single leak in them.I am very happy with these undies.
SGStephanie G.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black with White Polka Dot / M - Rated 5 out of 5 stars1 week agoBikini style
Didnt need the new super protection style? But they are smooth and comfortable in spite of the b additional coverage l
JMJoyce M.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black with White Polka Dot / S - Rated 5 out of 5 stars3 weeks agoGreat post partum undies!
I am such a huge fan of these super plus leakproof underwear from Knox - they’ve given me such confidence in doing activities where incontinence might be a concern 16 months post partum. Cannot recommend them enough!
HMHilary M.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black with White Polka Dot / S - Rated 5 out of 5 stars4 weeks agoGreat!
Fit great and work well!
MKMelissa K.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black / S - Rated 5 out of 5 stars1 month agoWorks so well!
I bought these for my teen girls because they were often leaking on their sheets overnight. No leaks since! 🙌
KMKelly M.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Warm Sand / XS - Rated 5 out of 5 stars1 month agoAmazing and reliable
I am able to sleep peacefully ok my period knowing this underwear protects me and saves me money on tampons and pads.
JHJacob H.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Warm Sand / M - Rated 5 out of 5 stars1 month agoI was pleasantly surprised
I really enjoyed them. I wasn’t sure what to expect, but I was ultimately pleasantly surprised during my period. I bought 6 pairs. So I was able to change regularly. Every day before work, and after, I put on a fresh pair. I never experienced any leakage, and I am a regular gym goer which made my workouts all the more comfortable. Although I was worried the whole time that I may leak, but nope nothing.
SLSherry L.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black / L - Rated 5 out of 5 stars1 month agoReview
Definitely 10/10
SGShelly G.Verified BuyerReviewingSuperPlus Leakproof® No-Show Bikini Black / XXL - Rated 5 out of 5 stars1 month ago5 Stars
Amazing for period protection. Resuable and saves so much money and prevents the wastefulness of pads.
BBrookeReviewingSuperPlus Leakproof® No-Show Bikini Twilight Navy / S
