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Home / Up to 60% off Bikini Underwear / Ultra Leakproof Zones+® Bikini
Hot Deal 🔥

Ultra Leakproof Zones+® Bikini

$25.00 USD

$36.00

2 for $40
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Absorbs about 9 super tampons

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Invisible under clothes

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Extended gusset for extra protection

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Machine washable

| Black
| Black
| Black
| Black
Made with soft, stretchy fabric that’s quick dry for your comfort | General

Made with soft, stretchy fabric that’s quick dry for your comfort

Designed with extra long protective coverage in the front & back | General

Designed with extra long protective coverage in the front & back

Washes just like regular underwear | General

Washes just like regular underwear

Absorbency: Ultra
Drop
Drop
Drop
Drop
Drop

Color: Black

Size:

True to Size

•

Size:

Size and Fit Guide

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Shipping

HOLIDAY SHIPPING

Give the gift of Knix! To receive your order by Dec 24th, please order by the following dates.

All States - Urban Centers (except Hawaii, Alaska)
Standard: Sunday, December 14
Express: Tuesday, December 17

Alaska, Hawaii & Rural
Standard: Wednesday, December 10
Express: Wednesday, December 10
Express shipping is unavailable for international orders:

Africa, Central/South America, and Caribbean
Standard: Wednesday, December 10

Asia, Australia, and New Zealand 
Standard: Thursday, December 11

Europe and the Middle East 
Standard: Thursday, December 11

United Kingdom, France, Germany, Netherlands, Switzerland, and Japan 
Standard: Monday, December 15

Please note: Weather conditions and carrier issues may cause delays. Delivery dates are not guaranteed.

Processing Time
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.

Delivery Time
For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines vary depending on location and do not include processing times.

Shipping Charges
Orders over $100* USD = Free standard Shipping (4-8 business days)**
Expedited = $4.99 USD (3-6 business days)**

Orders under $100* USD = $7.99 USD Standard Shipping (4-8 days)**
Expedited = $9.99 USD (3-6 business days)**

*After discounts, before shipping and taxes. Processing times not included in estimates.
**Military Addresses Excluded. Standard Military Address Shipping = $10.00 USD (est. varies per location)
Year End Sale Return Policy

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.
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"When Mother Nature decides to bless you with her presence on leg day, bust out this pair for a workout that’s as comfortable as possible."

- InStyle

Comfort-First Fit

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

Worry-Free Protection

Our most absorbent underwear features an extra-long liner that runs high in the front and up the back. Patented 360 LeakSeal™ technology provides leakproof protection at every edge.

Ultra Absorbency

Absorbs 9 super tampons worth of liquid—great for heavy flow days, overnight protection, and light bladder leaks.

No-Show Style

Made from our signature buttery-soft PerformaStretch® fabric, it appears invisible under clothing.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Black
| Black
| Black
| Black
Made with soft, stretchy fabric that’s quick dry for your comfort | General
Designed with extra long protective coverage in the front & back | General
Washes just like regular underwear | General

How to Choose?

Essential

Drop
Drop
Drop
Drop
Drop
  • • Everyday Wear
  • • No leakproof protection
  • tsp
    0 tsp

Heavy

Drop
Drop
Drop
Drop
Drop
  • • heavy period days
  • • overnight protection
  • • light bladder leaks
  • 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

Drop
Drop
Drop
Drop
Drop
  • • light period days
  • • sweat
  • • discharge
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

Drop
Drop
Drop
Drop
Drop
  • • moderate period days
  • • light bladder leaks
  • • sweat
  • 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

Drop
Drop
Drop
Drop
Drop
  • • extra heavy period days
  • • overnight protection
  • • light bladder leaks
  • 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
FRESH FIX TECHNOLOGY®

Built-in protection that feels like nothing at all.

Absorbs about 7-9 super tampons worth of liquid.

Soft Top Layer

Soft Top Layer

Gently wicks away moisture while keeping you feeling fresh and odor-free.

Our Best-Selling Underwear

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4.1
Rated 4.1 out of 5 stars
Based on 429 reviews
Total 5 star reviews: 266 Total 4 star reviews: 48 Total 3 star reviews: 40 Total 2 star reviews: 25 Total 1 star reviews: 50
77%would recommend this product
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429 reviews
  • Rated 4 out of 5 stars
    22 seconds ago
    Had an issue with the sizing

    I think these will be good. I had an issue where I felt like they were too big so I reached out to customer service and turns out that they are going to send me the next size down. Hopefully that does the trick.

    Kelly
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 hours ago
    Really Good

    Did the trick

    D
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    3 days ago
    1 Star

    These are uncomfortable and do not fit properly

    Pamela
    Was this helpful?
  • Rated 5 out of 5 stars
    3 days ago
    love these

    I constantly love these and would buy more if I could afford them. They are comfortable and do the job well. I don't think you want a picture of a 76 year old lady, but I love them and so does my sister whom I gift some to off and on

    Eli S.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    5 days ago
    Do not recommend

    It was too thick and big. I was not aware it was final sale. No happy customer.

    Susan F.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    The protection is there

    Im a curvy girl and I wondered if this diminutive style of this panty would do its job. No worries ladies! Ill order more in other colors.

    Marcy S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    6 days ago
    4 Stars

    They worked great but the medium was a little to big and bunched near the back.

    Isabella
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    I'm in love

    I love the feel and fit of these underwear. I highly recommend

    Angela J.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 week ago
    Not the Best

    The material is pretty stiff and not the most comfortable. I also sometimes found blood on the sides, which means it was shifting a lot despite getting the correct size. Definitely needs improvement!

    Makenzi S.
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Ultra leakproof zone bikini

    Did not like these ultra leakproof bikinis. Found way to thick

    Lise L.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Uncomfortable

    I wanted to like these. Wore them once, and unfortunately, will not wear again. I wore them for a few hours before bed and overnight. They move around a lot and need constant adjusting when in bed. Bled through the sides even though I did not bleed enough for that to make sense. They are moderately cheeky, and they felt like a diaper as they sagged in the middle and made them very uncomfortable to wear out of bed and in bed. I wanted them for heavier overnights and feel like I can't trust them for a lighter flow like I used them for.

    Jeanette N.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    5 Stars

    Definitely absorbed as advertised! My daughter has heavy periods and would leak on her sheets at least once a month. With these she had zero leaks and zero odor!

    Casey
    Was this helpful?