Skip to content

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
New

Super Leakproof® Cotton Bikini

$29.00 USD

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

Absorbs about 6 super tampons

Breathable cotton

More absorbency without the bulk

Machine washable

| Pepper
| Pepper
| Pepper
| Pepper
| General

Color: Pepper

Size:

True to Size

Size:

Size and Fit Guide

Build Your 3-Pack

Super Leakproof® Cotton Bikini

Color: Pepper

Size:

Size:

Super Leakproof® Cotton Bikini

Color: Pepper

Size:

Size:

Super Leakproof® Cotton Bikini

Color: Pepper

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.

First Pair Risk Free for 30 Days

Leakproof Underwear, Risk Free

Returns & Exchanges

New to leakproof? Your first pair is risk free for 30 days. Wear them, wash them, and see how they work for your body. Not right for you? We'll refund the item price (original shipping excluded). Prefer a different size or style? We also offer free exchanges. Just email info@knix.com and we'll take care of you.

Purchased leakproof before? Within 30 days of delivery you can exchange for another size, style, or store credit. We're unable to provide refunds on underwear. If you ordered multiple pairs, please open, wash, and wear one pair only before initiating an exchange.

Still have questions? View our full policy here.

Rewards Members Earn 29 Points

Comfort-First Fit

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

Heavy Absorbency

Absorbs about 6 super tampons worth of liquid—great for heavy days or overnights.

Cozy Cotton-Blend

Soft cotton with a hint of spandex feels luxurious against your skin.

Worry-Free Protection

Innovative floating liner provides leak protection from every angle.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Pepper
| Pepper
| Pepper
| Pepper
| 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®

Cotton meets patented protection.

A sewn-in, floating liner soaks up about 6 super tampons’ worth of liquid—so you stay fresh, comfortable, and in control.

Soft Top Layer

Gently wicks away moisture to keep you fresh and odor-free.

3.6
Rated 3.6 out of 5 stars
Based on 23 reviews
Total 5 star reviews: 9 Total 4 star reviews: 4 Total 3 star reviews: 4 Total 2 star reviews: 3 Total 1 star reviews: 3
57%would recommend this product
FitRated 0.1 on a scale of minus 2 to 2
ComfortRated 3.5 on a scale of 1 to 5
EffectivenessRated 3.9 on a scale of 1 to 5
Ease of UseRated 4.3 on a scale of 1 to 5
23 reviews
  • Rated 5 out of 5 stars
    23 hours ago
    Obsessed!

    I’m so in love with these underwear. They’re so comfortable and perfect for when I’m on my period and bloated.

    Brittany B.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 week ago
    Period Panties

    I bought these panties to try as primary period protection as I was sick of tampons and pads. My periods can be quite heavy with a lot of clots and these panties held up! No leaks. It’s unreal how much blood these panties can hold!

    Amanda J.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 week ago
    Goodbye Poise!

    These are a total game changer! They provide enough protection for bladder leaks too which is very comforting.

    Carrie N.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 week ago
    Loving the cotton

    Love the cotton. So comfortable and high quality like all your products. Thank you.

    Heidi L.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 week ago
    Super Comfy

    The cotton is so soft and seems to break in a little with time but doesn’t loose its shape. Perfect everyday companions!

    Brittany R.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 weeks ago
    5 Stars

    Best underwear ever

    Robyn
  • Rated 5 out of 5 stars
    3 weeks ago
    the best panties

    love!

    Teresa S.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    The garment maintained it's shape nicely and the stretch was comfortable, not too tight or loose and wasn't bothered. I found these bikini underwear to be very comfortable. Nothing was rubbing, stretching or too tight.

    Courtney W.
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    It was soft and not bulky. I felt like I was wearing regular underwear. It stayed in place and I never really thought about it. I just went on with my day.

    Sarah P.
  • Rated 4 out of 5 stars
    Yesterday
    Cotton Bikini Knix

    I love the product!!! I prefer the wider band at the top versus the thinner band.

    M C.
    Verified Buyer
  • Rated 4 out of 5 stars
    1 month ago
    4 Stars

    I appreciate that the sides of the gusset were not attached in case someone wanted to wear a pad with wings to keep it secured but i wish the centre was attached so it didnt move as much

    Joelle K.
  • Rated 4 out of 5 stars
    1 month ago
    4 Stars

    I normally wear the leakproof that is like a spandax material so i appreciate this one was looser. The material was soft

    Joelle K.

Your underwear questions, answered.