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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

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
4.5
Rated 4.5 out of 5 stars
Based on 6,735 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
Keywords
Keywords
Rating
Ratings
Height
Height
How do you use your Leakproof?
How do you use your Leakproof?
Usual Pant Size
Usual Pant Size
6,735 reviews
  • Rated 3 out of 5 stars
    4 minutes ago
    The size seem inconsistent

    Some felt tighter than others

    WA
    WANDA A. C.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini*
  • Rated 5 out of 5 stars
    14 hours ago
    Soft

    Soft and comfortable

    NP
    Natasha P.
    Verified Buyer
    Reviewing
    POS - Light Leakproof No-Show Bikini (ZSkus)
  • Rated 5 out of 5 stars
    2 days ago
    I was won over.

    I've heard of period underwear but was skeptical that they would be effective. I went with a light leakproof version to handle sweat and the daily vaginal discharge and I was pleasantly surprised of the comfort and absorbency. Will definitely order more pairs and see if they can handle period protection.

    BU
    Bernadette U.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini - Last Call
  • Rated 5 out of 5 stars
    3 days ago
    Love it

    Over all it's a great product.

    JT
    Joy T.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
  • Rated 3 out of 5 stars
    3 days ago
    3 Stars

    Size up, the parties run small

    L
    Leilani
    Reviewing
    Light Leakproof No-Show Bikini
  • Rated 3 out of 5 stars
    3 days ago
    3 Stars

    The panties run small, size up.

    L
    Leilani
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack - Last Call
  • Rated 5 out of 5 stars
    1 week ago
    5 Stars

    The feel of the fabric is awesome, but the print on the pink pair is too sweet!

    J
    Julie
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack - Last Call
  • Rated 5 out of 5 stars
    1 week ago
    5 stars

    I can't say enough good things about these. They fit perfectly and are perfect for light days or for added protection with tampons. I finally have peace of mind when my period comes now. They are truly no-show and very comfortable.

    DR
    Deidre R.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack - Last Call
  • Rated 4 out of 5 stars
    1 week ago
    Haven’t used yet

    I haven’t gotten a chance to use them yet but can already tell they’re better quality than other brands. Will update after use.

    MP
    Megan P.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini
  • Rated 5 out of 5 stars
    1 week ago
    Finally feel dry

    Even wearing cotton underwear, I never felt dry. I bought a pack of these to just try them out. Now I am getting a few more packs

    JH
    Jeana H.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini 3-Pack - Last Call
  • Rated 5 out of 5 stars
    1 week ago
    Nice

    I’ve been wearing Knox underwear for a few years now and they work great for helping with leaky bladder issues .

    JA
    Jamie A.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini*
  • Rated 5 out of 5 stars
    1 week ago
    as good as it gets

    as good as it gets

    RG
    regina g.
    Verified Buyer
    Reviewing
    Light Leakproof No-Show Bikini*