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Home / Thong Underwear / Super Leakproof® No-Show Thong

Super Leakproof® No-Show Thong

$29.00 USD

Mix & Match: 3+ for $25 each
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Absorbs about 4 super tampons

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Invisible under clothes

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Perfect for daily wear

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Machine washable

Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

| Black
Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

| General

Ashley has 39” hips and wears KNIX S

Absorbency: Moderate

Moderate
Drop
Drop
Drop
Drop
Drop
about 2-4 super tampons
Essential
Drop
Drop
Drop
Drop
Drop
No Absorbency
Light
Drop
Drop
Drop
Drop
Drop
about 1-3 regular tampons

Color: Black

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.
Easy Exchanges within 30 Days

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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"I genuinely thought my thong days on my period were over. But there I was, rocking my jeans with zero leaks, no worries, and full comfort and confidence."

- Glamour

Comfort-First Fit

Thong style with a mid-rise fit and minimal bum coverage.

Worry-Free Protection

Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.

Moderate Absorbency

Absorbs 4 super tampons worth of liquid—perfect for heavy flow days, overnight protection, and light bladder leaks.

No More Panty Lines

Made from our signature buttery-soft fabric and designed to be invisible under clothes, including leggings.

Easy to Wash

Machine washable just like regular underwear.

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Ashley has 39” hips and wears KNIX S | Black
| Black
Ashley has 39” hips and wears KNIX S | Black
Ashley has 39” hips and wears KNIX S | Black
| 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
PATENTED LEAKPROOF TECHNOLOGY

Built-in protection that feels like nothing at all

Our original Fresh Fix Technology® features a built-in absorbent liner absorbing about 3-6 super tampons worth of liquid so you feel fresh and in-control.

Soft Top Layer

Soft Top Layer

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

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4.4
Rated 4.4 out of 5 stars
Based on 1,838 reviews
Total 5 star reviews: 1.3k Total 4 star reviews: 243 Total 3 star reviews: 107 Total 2 star reviews: 62 Total 1 star reviews: 92
89%would recommend these products
ComfortRated 4.4 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 4.3 on a scale of 1 to 5
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1,838 reviews
  • Rated 5 out of 5 stars
    6 days ago
    Amazing

    These are so comfortable and a life saver on heavy days I can’t live without them

    Michelle O.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    5 Stars

    I love it!

    Loni
    Was this helpful?
  • Rated 4 out of 5 stars
    2 weeks ago
    Great for any leakage

    Make me feel protected when I’m at work. Haven’t leaked at all during my period. They are a bit snug on me but the large will be too big on me

    Amy M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Works well

    I have been going to another company for my underwear for incontinence. Knox was having a great sale so thought I would try. Material is completely different and kind of unusual to get used to but once I got the correct size, they are bad. Works for they are needed for.

    Laura N.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 weeks ago
    Get them!

    I had been holding off on getting these because of the price. A friend told me about them because while we were playing a fun adult game of soccer I had tinkled a bit in my underwear:( I’m 42 and have given birth so things are not like they used to be.

    I bought 3 pairs and my period had started the day they were delivered. I figured I would try them out during my cycle because I hate wearing full bottom underwear. The thongs were amazing and I never leaked once! I ordered 4 more pairs during a Black Friday sale. After my menstrual cycle I played a game of coed flag football. I wore my Knix and was not worried at all! Just a little accidental urine and no leaking! I no longer have to worry or be embarrassed. Thank you Knix!

    Tara H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    Comfortable and truly outfit saving. Even wore under leggings and it wasn’t apparent they were any different than a normal pair.

    Elisa
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    Comfortable and truly outfit saving. Even wore under leggings and it wasn’t apparent they were any different than a normal pair.

    Elisa
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    Love them

    Rochelle
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Great except the new sewn in tag

    I love all Knix underwear but I was surprised and not thrilled with new scratchy sewn in tags that I now have to cut out and risk ripping the seam. Why did that change?

    Jennifer R.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 month ago
    Poor fit

    I wish these fit. They are too big. Especially in the crotch gusset making them super uncomfortable. I wear a M but these are way to wide. Now I have $100+ in underwear that doesn't fit, and can't return because they've been washed.

    E
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Amazingly Leakproof!!

    I love allll my knix products and this Leakproof thong is perfect when you want to make sure your period underwear don't show through a cute outfit! 1000000/10 highly recommend!!!

    Lauren D.
    Verified Buyer
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  • Rated 5 out of 5 stars
    1 month ago
    Super leakproof no show Thong

    The large size was too loose - size medium fits better - a tad tight.

    Sharon M.
    Verified Buyer
    Was this helpful?