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Home / Bikini Underwear / Leakproof Cotton Bikini
Best Seller

Leakproof Cotton Bikini

Our no-show, bikini-cut cotton period underwear.
$25.00 CAD

| Rose Water
| Rose Water
| Rose Water
| Rose Water
| General

Absorbency: Moderate
Drop
Drop
Drop
Drop
Drop

Color: Rose Water

Size:

True to Size

•

Size:

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*
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.

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* CAD = Free Shipping (2-6 business days)
Orders under $100* CAD = $12 CAD Shipping (1-3 business days)
Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.
*After discounts, before shipping and taxes.
Easy Exchanges within 30 Days

Returns

Returns
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.

Sale & Last Call

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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Good to Go Seamless Bra

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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.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Rose Water
| Rose Water
| Rose Water
| Rose Water
| 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 147 reviews
Total 5 star reviews: 113 Total 4 star reviews: 13 Total 3 star reviews: 9 Total 2 star reviews: 7 Total 1 star reviews: 5
86%would recommend these products
ComfortRated 4.6 on a scale of 1 to 5
EffectivenessRated 4.6 on a scale of 1 to 5
FitRated 0.0 on a scale of minus 2 to 2
Ease of UseRated 4.9 on a scale of 1 to 5
Write a Review (Opens in a new window)
147 reviews
  • Rated 2 out of 5 stars
    3 days 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
    3 days 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
    2 weeks 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?
  • Rated 5 out of 5 stars
    2 weeks ago
    Peace of Mind

    I bought these as a backup for when I have a bad cold and cough a lot (iykyk). They work perfectly, providing excellent protection for light bladder leaks.

    Janice Z.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 weeks ago
    Very comfortable for wearing as primary period protection

    I love these. Wore them all day for primary period protection. Very comfortable and kept me comfortable.

    Lisa F.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Great for pregnancy

    Been dealing with bladder leaks in pregnancy and these have given me so much relief. More comfortable than poise pads.

    Dana
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    So comfy

    Love the coverage and the comfort!

    Sharlene G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Knix bikini

    I love these all cotton leakproof underwear. They are just as described. They are not bulky and I feel more confident wearing them because they will catch potential leaks.

    Rosa R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Got these to try out

    These were comfortable to try for the first time. They feel like I have only underwear on. Feels lightweight at night when I am sleeping. 100% would buy these again.

    Ashley B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Great!

    Very comfortable and brings me a sense of confidence. I'm a size 2X and I bought a XXXL size underwear.

    Lisa R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    5 Stars

    So comfortable and feels like im wearing regular underwear. Made it easy to make it through my busy work day without worrying about anything.

    Jayden
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    Love this product!

    Don't have to worry about constantly changing tampons. Highly recommend.

    Stephanie R.
    Verified Buyer
    Was this helpful?