Shop by Style

More Ways to Shop

Need Help Choosing?
Why Knix Leakproof Works

Bras

Need Help Choosing?
Find Your Bra Size
New Arrivals
New: SculptRib™
NEW Shape & Smooth Bra
Shop by Life Stage

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

Suggestions

Top Picks

Revolution V-Neck Bra

$65.00 USD
10% off Bra & Underwear Sets*

Color: Lavender Limited Edition

+11

Super Leakproof® Dream Boxer™

$48.00 USD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Lavender Stripe Limited Edition

Leakproof UltraThin No-Show High Rise

$32.00 USD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Meadows Limited Edition

+6

Uplift Push Up Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Rose Water

+1
Home / Thong Underwear / Super Leakproof® No-Show Thong - Original - Last Call
Sale

Super Leakproof® No-Show Thong - Original - Last Call

$20.30 USD

$29.00

30% off

Absorbs about 2.5 regular tampons

Invisible under clothes

Perfect for daily wear

Machine washable

| Warm Sand
| Warm Sand
| Warm Sand
| Warm Sand
| General
| General

Absorbency: Moderate

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 20 Points

"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 2.5 super tampons worth of liquid—perfect for moderate flow days, light bladder leaks, and sweat. The carbon cotton gusset top layer keeps you dry.

No-Show Style

Buttery-soft and smooth fabric gives a seamless look and feel. Disappears under clothes, even leggings.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Warm Sand
| Warm Sand
| Warm Sand
| Warm Sand
| General
| 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

Explore Best-Sellers

Shop All

Revolution V-Neck Bra

$65.00 USD
10% off Bra & Underwear Sets*

Color: Black

+11

Super Leakproof® Dream Boxer™

$48.00 USD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Black

WingWoman Contour Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Black

+2

Super Leakproof® Dream Short™

$48.00 USD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Warm Sand

+1

Uplift Push Up Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Warm Sand

+1

Leakproof UltraThin No-Show Bikini

$27.00 USD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Warm Sand

+4

Catalyst Sports Bra

$78.00 USD
10% off Bra & Underwear Sets*

Color: Black

HiTouch™️ High Rise Legging

$88.00 USD

Color: Twilight Navy

4.4
Rated 4.4 out of 5 stars
Based on 1,865 reviews
Total 5 star reviews: 1.4k Total 4 star reviews: 248 Total 3 star reviews: 108 Total 2 star reviews: 62 Total 1 star reviews: 95
89%would recommend these products
FitRated -0.1 on a scale of minus 2 to 2
ComfortRated 4.4 on a scale of 1 to 5
EffectivenessRated 4.5 on a scale of 1 to 5
Write a Review (Opens in a new window)
1,865 reviews
  • Rated 5 out of 5 stars
    3 minutes ago
    Obsessed!

    I've been hunting everywhere for a period thong, and these are PERFECT! I feel protected during my period days, and these are some comfortable. I will absolutely be purchasing more of these, and I would highly recommend them.

    Haydn W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Cute & effective

    These are cute & effective. They are great for periods and bladder leaks.

    Sharon S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Job done well

    No show panty line.

    No leaks.

    All well in these undies.

    Charlotte
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Fantastic Thong

    I have purchased several leak proof panties including thongs from other companies before I knew about Knix.

    I found my Knix thong to not show under my yoga pants at all and really comfortable. They did absorb leaks well and I was very pleased with my Knix thong!

    Marci S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Great product. Perfect for heavy workout sessions

    I like these thongs because they absorb swat for active workouts. They do the job.

    Jacqui G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    These are amazing!!

    I love these panties!!! I’ve been a loyal customer since day one. I will NEVER wear anything else.

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

    Beautiful. Thin. Feels like regular underwear.

    Brittany
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Love for everyday!

    I'm in my 50s, and so is my pelvic floor. These are an amazing solution to not having to wear a panty liner every day!

    Bethany A.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    My Go To!

    I prefer the super leakproof, that way you are fully covered for the unexpected. Everything is retained, absorbed, and maintained to the end of your day. I’m very happy to find these in new colors. Hoping that continues. I might be moving to the super leakproof boy shorts since I think my skin is reacting to the fabric softener used on my jeans. Love the thing and its coverage is perfect, but now dealing with skin sensitivity. Ugh, it never ends

    Emily B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Favorite undies

    Honestly wear these every day even when I’m not on my period!

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

    These are very comfortable for a padded thong. I will be purchasing more!

    Emma J.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Amazing

    Love the silky soft material, feels like your not wearing anything at all, works just as good as a pad, and keep less plastic out of land fills. Absolutely love it.

    Ashley B.
    Verified Buyer
    Was this helpful?

Shop by Category

Bras

Leakproof Underwear

New Arrivals

Best Sellers

Apparel

Active

Shapewear

Mens

Teen

Your questions, answered.

Shop by Category

Bras

Leakproof Underwear

Sleep

New Arrivals

Best Sellers

Apparel

Active

Shapewear

Teen

Mens