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Home / Bikini Underwear / Leakproof Cotton Bikini
Best Seller

Leakproof Cotton Bikini

$25.00 USD

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Absorbs about 3 super tampons

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Breathable cotton comfort

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More absorbent without the bulk

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Machine washable

Gabrielle has 48” hips and wears a Knix size XXL | Pepper

Gabrielle has 48” hips and wears a Knix size XXL

| Pepper
Gabrielle has 48” hips and wears a Knix size XXL | Pepper

Gabrielle has 48” hips and wears a Knix size XXL

Gabrielle has 48” hips and wears a Knix size XXL | Pepper

Gabrielle has 48” hips and wears a Knix size XXL

| General

Gabrielle has 48” hips and wears a Knix size XXL

Absorbency: Moderate
Drop
Drop
Drop
Drop
Drop

Color: Pepper

Size:

True to Size

•

Size:

Size and Fit Guide

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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.

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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.

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

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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)
Easy Exchanges within 30 Days

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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.

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

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

Worry-Free Protection

An innovative floating gusset provides leak protection from every angle.

Moderate Absorbency

Absorbs about 3 super tampons worth of liquid—great for moderate flow days, light bladder leaks, and sweat.

Cozy Cotton-Blend

Soft cotton spandex feels luxurious against your skin.

OEKO-TEX® Certified

Certified according to OEKO-TEX® STANDARD 100, Product Class I : HK020 246396 TESTEX

Easy to Wash

Machine washable just like regular underwear.

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Gabrielle has 48” hips and wears a Knix size XXL | Pepper
| Pepper
Gabrielle has 48” hips and wears a Knix size XXL | Pepper
Gabrielle has 48” hips and wears a Knix size XXL | Pepper
| 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 2-3 super tampons worth of liquid.

Soft Top Layer

Soft Top Layer

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

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4.5
Rated 4.5 out of 5 stars
Based on 158 reviews
Total 5 star reviews: 120 Total 4 star reviews: 13 Total 3 star reviews: 9 Total 2 star reviews: 9 Total 1 star reviews: 7
85%would recommend this product
ComfortRated 4.5 on a scale of 1 to 5
EffectivenessRated 4.5 on a scale of 1 to 5
FitRated 0.1 on a scale of minus 2 to 2
Ease of UseRated 4.7 on a scale of 1 to 5
Write a Review (Opens in a new window)
158 reviews
  • Rated 2 out of 5 stars
    Yesterday
    Disappointed, not the same as no-show styles

    Wanted to switch to cotton for more breathable options but these are not the same as the seamless no-show styles from Knix. The seams are very thick and the gusset absorbent pad is as thick as a heavy flow maxi pad. It definitely feels like you’re wearing a diaper and it shows if you’re wearing leggings or anything tight. I decided to keep anyway because I do like cotton but I would only wear these under very loose pants or dresses/skirts and only on heavier flow days. I wish Knix would show the pic of what the gusset looks like on their product page so everyone can see what they’re getting.

    Winnie
    Verified Buyer
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  • Rated 5 out of 5 stars
    2 days ago
    I've never been so happy with underwear

    I've been a Knix fan for many years, and swear by their leak proof undies. That said, I could not possibly be more impressed with these. They're incredibly comfortable, absorbent enough that I don't feel like I'm wearing a wet diaper all day, and really a lovely underwear experience. Thanks for the upgrade, Knix!

    Anon
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    5 Stars

    Liked these so much I ordered 3 more!

    Susan
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    5 Stars

    Great improvement with the cotton briefs from my last order. Comfy and well made. Will buy as again.

    Angela
    Was this helpful?
  • Rated 2 out of 5 stars
    1 week ago
    floating gusset

    I ordered a 6 pack of large on sale. I did not expect how the liner would be free from the actual panties on the sides. The fit is fine but when I'm just walking, I feel like they need to be adjusted. I don't like wearing them and I can't return them.

    Marlenna
    Verified Reviewer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Very uncomfortable

    The seams are thick and very uncomfortable when sitting or walking. They aren't digging in (I'm wearing my regular size) but I feel them throughout the day. They're also very noticeable under pants and jeans. I wasn't expecting them to be shaped slightly differently than the regular leakproof bikini underwear. Not sure if that's the reason they shift/move during normal daily activities but that's also an issue. I ordered these because I wanted to switch to a cotton version of the leakproof bikini for my workouts but can't imagine wearing them during cardio.

    Holly
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Very comfortable!

    Pretty colours. Fit wonderfully.

    Kim H.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    3 weeks ago
    Uncomfortable

    The leak proof gusset that is sewed into the garment has seams on both ends which fold over and are quite uncomfortable - I would never order this type again.

    Laurie
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Great 👍

    Fast speedy delivery

    Comfortable

    Judy S.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 month ago
    Disappointed

    I normally wear XXL in the regular Knix. I tend to sweat in the regular Knix so wanted to try cotton. They are much bulkier and the line where the absorbent liner ends shows through my work pants. They also fit much snugger.

    Hannah
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Love

    The material is so soft and the fit is great. My only "complaint" is I can sometimes feel the protective lining, but it could be my body habitus.

    I wish these had been available in my teens, they definitely would have helped an embarrassing leaking episode for15 year old me. I will definitely recommend these to anyone having periods, bladder leaks or sweating.

    Patricia F.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Great period pants

    I’m 5’3” and weigh 125 lbs. the bikinis fit perfectly.

    I wear them for urine leakage and have had no accidents.

    Jane K.
    Verified Buyer
    Was this helpful?