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Ultra Leakproof Zones+® Bikini - Last Call

$21.60 USD

$36.00

40% off

Absorbs about 9 super tampons

Invisible under clothes

Extended gusset for extra protection

Machine washable

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

Designed with extra long protective coverage in the front & back

Washes just like regular underwear

Color: Warm Sand

Size:

True to Size

Size:

Size and Fit Guide

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.

Last Call Return Policy

Sale & Last Call

Our Sale Policy

Here's how returns and exchanges work for sale items.

  • Items discounted up to 30% are eligible for a size exchange or store credit
  • Items discounted above 30% are final sale. No refunds, store credits, or exchanges
  • Not sure where your item lands? Chat with us and we'll check for you

Still have questions? View our full policy here.

Rewards Members Earn 21 Points

"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

Product Description

Experience maximum absorbency and confident protection with the Knix Ultra Leakproof Zones+® Bikini, designed with an extra‑long liner and patented 360 LeakSeal™ technology to absorb about 9 super tampons’ worth of liquid — ideal for heavy period days, overnight protection, and light bladder leaks. Made from soft, quick‑dry, buttery‑soft PerformaStretch® fabric that lies invisible under clothes, this mid‑rise bikini silhouette delivers a comfortable fit with medium hip and bum coverage and easy machine‑washable care. With extended protective coverage front and back and dependable leakproof performance built into every edge, it’s a trusted choice for everyday confidence and comfort.

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

| Warm Sand
| Warm Sand
| Warm Sand
| Warm Sand
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

  • 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
FRESH FIX TECHNOLOGY®

Built-in protection that feels like nothing at all.

Absorbs about 7-9 super tampons worth of liquid.

Soft Top Layer

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

4.1
Rated 4.1 out of 5 stars
Based on 464 reviews
Total 5 star reviews: 289 Total 4 star reviews: 51 Total 3 star reviews: 43 Total 2 star reviews: 26 Total 1 star reviews: 55
77%would recommend these products
Rating
Ratings
464 reviews
  • Rated 5 out of 5 stars
    3 weeks ago
    Five stars

    Comfortable fit and easy to care for. Perimenopause means irregular periods but I don't worry when I am wearing these.

    Tracey G.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 3 out of 5 stars
    2 months ago
    Not ultra enough

    I wore these brand new on day 1 of my period. I should’ve tested them. I mostly sit at work and so I was asking a lot of the area right under me. Well it did not hold up. After 3 hours I stood up and could tell the underwear had leaked. Not a total catastrophe, but enough to stain the pants I was wearing. Maybe these will be best for light days.

    Kadi C.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 2 out of 5 stars
    3 months ago
    Uncomfortable but effective

    I felt squeezed all the time but appreciated the effectiveness with leaks.

    Elizabeth K.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 4 out of 5 stars
    3 months ago
    Great customer service

    Super comfortable and worked good for daytime. These did not work for me personally because I am a stomach sleeper and I the padding in the front would not be sufficient for heavier overnight flows. I literally put my pads way higher in the front for sleeping.

    When I reached out to customer service about the return, they were so helpful and kind. Even though I have only worn 2 of the 7 pair, I had opened all 7. Because of this, they reimbursed me without needing to return and said I was free to pass them along to someone else to try. I thought that was very generous and made it easier on me. Try them today without fear of a customer service fight.

    Hannah J.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 5 out of 5 stars
    4 months ago
    Overnight confidence

    I love these. I can sleep without worrying about the sheets. They also feel like regular underwear, so they are comfortable to wear as well.

    Mélissa R.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini Kit
  • Rated 3 out of 5 stars
    4 months ago
    Good absorbency, bad design

    I’m disappointed because the absorbency is great, but the design leaves a lot to be desired. Due to the absorbent part not going from waistband to waistband, I get bunching/bulging in the back while the front gets pulled down after an hour or two of wear. I have to constantly readjust by pulling the underwear from the front. I’ll only be using these for nighttime from now on.

    Sarah
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 5 out of 5 stars
    4 months ago
    Ultra Leakproof

    Loved them

    Janet F.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 5 out of 5 stars
    4 months ago
    Great fit and no leaks

    These fit wonderful and do not leak

    Devaney W.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini Kit
  • Rated 5 out of 5 stars
    4 months ago
    Great!

    Terrific bikini. I was worried that it would be too bulky with the thicker pad, but it's not.

    Hollis K.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini Kit
  • Rated 5 out of 5 stars
    4 months ago
    Great!

    Terrific! I was worried that it would be too bulky but it's not.

    Hollis K.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini Kit
  • Rated 1 out of 5 stars
    4 months ago
    Product Delivery

    Paid for a product that never arrived and after "chatting" with Knix, I was told sorry and a refund was issued.

    Anonymous
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call
  • Rated 1 out of 5 stars
    4 months ago
    Poor performance

    Does not absorb even minor leaks. Material is not conducive to this.

    Norma S.
    Verified Buyer
    Reviewing
    Ultra Leakproof Zones+® Bikini - Last Call

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