Skip to content Accessibility Statement

Shop by Style

More Ways to Shop

Leakproof Quiz
Why Knix Leakproof Works

Bras

More Ways to Shop

Bra Quiz
Buy a Bra. Get free undies.
NEW Shape & Smooth Bra

Swim

New & Trending

Back in Stock
NEW: Shape & Smooth
New Arrivals
15% off Founder's Pick

Your Bag

Your cart is empty

But you're full of potential..
Create an account to join Club Knix and earn points on this order

Suggestions

Top Picks

Super Leakproof® Mini Dream Boxer

$48.00 USD
Buy More, Save More

Color: Pink Stripe Limited Edition

+3

Super Leakproof® Dream Short™

$42.00 USD
Buy More, Save More

Color: Black

+4

Leakproof UltraThin No-Show Bikini

$27.00 USD
Buy a Bra, Get FREE Underwear

Color: Mulberry Limited Edition

+4

Super Leakproof® Dream Boxer™

$48.00 USD
Buy More, Save More

Color: Mulberry/Pink Stripe Limited Edition

+1
Home / Bikini Underwear / Light Leakproof No-Show Bikini
New

Light Leakproof No-Show Bikini

$25.00 USD

Buy 3+ Save 15%, Buy 5+ Save 20%

Absorbs about 1 regular tampon

Invisible under clothes

Perfect for daily wear

Machine washable

Light Leakproof No-Show Bikini shown front-facing against a light gray background
Front view of model wearing the Light Leakproof No-Show Bikini highlighting the coverage and smooth fit
Back view of model wearing the Light Leakproof No-Show Bikini highlighting the coverage and smooth fit
Front view of model wearing the Light Leakproof No-Show Bikini highlighting the coverage and smooth fit
Text on Image: Wear on their own or as backup protection
Text on Image: Made with soft, stretchy fabric that's quick dry for your comfort

Absorbency: Light

Light
about 1-3 regular tampons
Essential
No Absorbency
Moderate
about 2-4 super tampons
Heavy
about 4-7 super tampons
Ultra
about 7-11 super tampons

Color: Rose Water

Size:

True to Size

•

Size:

Size and Fit Guide

Build Your 3-Pack

Light Leakproof No-Show Bikini shown front-facing against a light gray background

Light Leakproof No-Show Bikini

Color: Rose Water

Size:

Size:

Light Leakproof No-Show Bikini shown front-facing against a light gray background

Light Leakproof No-Show Bikini

Color: Rose Water

Size:

Size:

Light Leakproof No-Show Bikini shown front-facing against a light gray background

Light Leakproof No-Show Bikini

Color: Rose Water

Size:

Size:

Free Shipping on orders $100+

Shipping

Shipping

Processing Timelines

Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order. Once an order is placed, we cannot guarantee any address updates, order changes or cancellations. Orders placed on Friday after 1PM will not be shipped until the following Monday.


Split Shipments

Most orders will ship from a single warehouse. However, we occasionally ship from a combination of warehouse locations, so you may receive your order in multiple parts. If items from your order ship in separate packages, we’ll send you tracking information for each package when it becomes available.

Delivery Timelines

For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines do not include processing times. See above for details. All transit times are measured in business days which are Monday-Friday, excluding holidays.

Please note, all shipping timelines are estimates and are not guaranteed.

We are not able to ship to US territories (including Puerto Rico, U.S. Virgin Islands, Guam, Northern Mariana Islands and American Samoa) at this time.
Easy Exchanges within 30 Days

Returns

Returns

Sale & Last Call

Items discounted 30% and below are eligible for size exchange or store credit. Items discounted above 30% and above are final sale – no refunds, store credits, or exchanges can be accommodated.

Free Returns

Knix covers the return shipping fees for exchanges and refunds initiated through our Return & Exchange Portal. Exchange orders initiated through our Return & Exchange portal are also eligible for free shipping within the USA and Canada. Please note, the shipping fees on your original order are non-refundable.

Return Policy

Return policy varies by product, please check if your item is refund or exchange eligible by viewing our full policy here.
Rewards Members Earn 25 Points

"...the most comfortable period underwear I've ever tried."

- Good Housekeeping

Product Description

So thin, you’ll forget you’re wearing anything. This style has medium bum and hip coverage. Our original leakproof technology offers a barely-there feel while absorbing about 1 regular tampon or pantyliner worth of liquid. Patented bonded edges help prevent against side leaks. These underwear feature our signature buttery soft fabric. No show construction is designed to be invisible under clothes, including workout leggings

Comfort-First Fit

Bikini silhouette with a classic mid-rise fit, medium hip and bum coverage.

Worry-Free Protection

Our original leakproof technology provides a barely noticeable feel. Patented bonded edges help prevent side leaks.

Light Absorbency

Absorbs 1 regular tampon worth of liquid—perfect for light flow days, sweat and discharge, and backup protection for heavy flow days.

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.

Zoom

How to Choose?

Essential

  • • Days you don’t need leak protection. Everyday freshness and moisture wicking.
  • tsp
    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.
  • tsp
    about 8-14 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 4-7 super tampons
  • cup
    about 1.5-3 menstrual cups

Light

  • • Daily freshness. For sweat, discharge, period spotting, or backup protection.
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

  • • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
  • tsp
    about 4-8 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-4 super tampons
  • cup
    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.
  • tsp
    about 15-20 tsp
  • pad
    about 1.5-2.5 super pads
  • tampon
    about 7-11 super tampons
  • cup
    about 2-3 menstrual cups

Explore Best-Sellers

Shop All

Super Leakproof® Mini Dream Boxer

$48.00 USD
Buy More, Save More

Color: Pink Stripe Limited Edition

+3

Super Leakproof® Dream Short™

$42.00 USD
Buy More, Save More

Color: Twilight Navy

+4

Super Leakproof® Dream Boxer™

$48.00 USD
Buy More, Save More

Color: Blue Stripe

+1

Shape & Smooth Bra

$68.00 USD
Buy a Bra, Get FREE Underwear

Color: Warm Sand

Leakproof UltraThin No-Show Bikini

$27.00 USD
Buy a Bra, Get FREE Underwear

Color: Warm Sand

+4

Revolution V-Neck Bra

$65.00 USD
Buy a Bra, Get FREE Underwear

Color: Black

+7

WingWoman Contour Bra

$68.00 USD
Buy a Bra, Get FREE Underwear

Color: Black

+1

SuperPlus Leakproof® Dream Short™

$48.00 USD
Buy More, Save More

Color: Twilight Navy

+1
4.5
Rated 4.5 out of 5 stars
Based on 6,439 reviews
What our customers are saying
Customers say these underwear are incredibly comfortable and feel like wearing nothing at all. Many appreciate the soft, butter-like fabric and no-show design that works well under tight clothing without visible panty lines. Users find them effective for light protection during periods, spotting, or minor bladder leaks, with many praising the confidence they provide for daily wear. Common feedback includes that they run small, with several reviewers recommending sizing up for better fit. Some mention the absorbent area could extend higher in the front for better coverage. While most love the comfort and functionality, a few note issues with side leakage or fabric breathability.
91%would recommend these products
FitRated -0.2 on a scale of minus 2 to 2
ComfortRated 4.6 on a scale of 1 to 5
EffectivenessRated 4.6 on a scale of 1 to 5
Search
Search Reviews
Keywords
Keywords
Rating
Ratings
Height
Height
How do you use your Leakproof?
How do you use your Leakproof?
Usual Pant Size
Usual Pant Size
Write a Review (Opens in a new window)
6,439 reviews
  • Rated 5 out of 5 stars
    3 minutes ago
    Leakproof no-show bikini

    I love this product, I’ve been wearing this brand for years. They are way better than other brands. I have tried because the crotch area doesn’t go halfway up your bum, so therefore it doesn’t show through leggings.

    DL
    Deborah L. H.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?
  • Rated 5 out of 5 stars
    13 minutes ago
    Discreet

    Takes the worry out of bladder leaks.

    AC
    Amy C.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?
  • Rated 5 out of 5 stars
    7 hours ago
    Rutten Review

    I like them. Just wish I would have ordered briefs.

    MR
    Marie R.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?
  • Rated 5 out of 5 stars
    12 hours ago
    Love these panties

    I have several pairs of these, and they are very comfy. I'm in menopause so don't have to worry about periods, but they are great for light leaks and to stay fresh. They fit true to size, and don't ride up.

    LM
    Leanne M.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Perfect fit

    Excellent protection

    BL
    Berenice L. L.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack - Last Call
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    Knix is a lifesaver

    Knix has been a lifesaver since perimenopause made me wildly irregular. Thanks to leak-proof underwear I was able to buy white shorts. *White* *Shorts*

    Miraculous

    AF
    Alison F.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Amazing!

    I love Knix products! They are comfortable, feel good, priced right and it is so nice not to have to worry about if I might have an accident! I feel free!

    HD
    Hope D.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini - Last Call
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Great fit and very comfortable!

    These panties fit well, stay in place and are very discreet. Love them!

    RT
    Robyn T.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    5 Stars

    love these panties, but they do stretch out pretty quickly and I am usually not thrilled about the patterns or colors in bundles they are worth it. So soft and comfortable and no lines!

    J
    Janessa
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    5 Stars

    I love these panties, but they do stretch out pretty quickly and I am usually not thrilled about the patterns or colors in bundles they are worth it. So soft and comfortable and no lines!

    J
    Janessa
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Best ever

    Love love love! The fit is perfect. It’s true to size.

    KL
    Krissy L.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    My go-to underwear

    I've been buying these since 2021 and that won't change anytime soon. They are great.

    LB
    Lauren B.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
    Was this helpful?