Your Bag

Your cart is empty

But you're full of potential..
Rewards Members Earn 0 Points

Suggestions

Top Picks

Revolution V-Neck Bra

$65.00 USD
10% off Bra & Underwear Sets*

Color: White with Black Polka Dot Limited Edition

Super Leakproof® Dream Boxer

$48.00 USD

Color: Plaid Limited Edition

Leakproof UltraThin No-Show High Rise

$32.00 USD
Mix & Match: 3+ for $25 each

Color: Black with White Polka Dot Limited Edition

WingWoman Contour Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Black

Home / Thong Underwear / Light Leakproof UltraThin No-Show Thong
Best Seller

Light Leakproof UltraThin No-Show Thong

$27.00 USD

Mix & Match: 3+ for $20 each
Checkmark

Absorbs about 2 regular tampons

Checkmark

Invisible under clothes

Checkmark

More absorbency without bulk

Checkmark

Machine washable

| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| General
| General
| General
| General

Absorbency: Light

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

Color: Black with White Polka Dot Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Free Express Shipping on orders $125+

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.
Rewards Members Earn 27 Points

Comfort-First Fit

Thong silhouette sits lower on the hip with 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

It absorbs about 2 regular tampons worth of liquid—great for regular flow days, light bladder leaks, and sweat.

No-Show Style

Made from our signature buttery soft fabric with a wide, comfortable waistband. Wear it on its own or under your favorite pajamas.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| General
| General
| General
| 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.

Our patented 360 LeakSeal™ technology locks in leaks at every edge. The ultra-thin liner absorbs about 2.5 super tampons worth of liquid.

Soft Top Layer

Soft Top Layer

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

Our Best-Selling Underwear

Shop All Arrow Right

Super Leakproof® Dream Team Kit

From 
$80.00 USD
$96.00
Save $16

Super Leakproof® Dream Short

$48.00 USD

Color: Black with White Polka Dot Limited Edition

SuperPlus Leakproof® No-Show High Rise

$39.00 USD
Mix & Match: 3+ for $33 each

Color: Black

Leakproof UltraThin No-Show High Rise

$32.00 USD
Mix & Match: 3+ for $25 each

Color: Black with White Polka Dot Limited Edition

Light Leakproof No-Show Bikini

$25.00 USD
Mix & Match: 3+ for $20 each

Color: Warm Sand

Super Leakproof® Dream Boxer

$48.00 USD

Color: Plaid Limited Edition

Leakproof UltraThin No-Show French Cut

$27.00 USD
Mix & Match: 3+ for $25 each

Color: Blue Light Limited Edition

Essential No-Show High Rise 5-Pack

$95.00 USD
$125.00
Save $30

Color: Blue Multi Limited Edition

4.0
Rated 4.0 out of 5 stars
Based on 221 reviews
Total 5 star reviews: 142 Total 4 star reviews: 20 Total 3 star reviews: 16 Total 2 star reviews: 14 Total 1 star reviews: 29
76%would recommend these products
ComfortRated 3.9 on a scale of 1 to 5
EffectivenessRated 4.1 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
Write a Review (Opens in a new window)
221 reviews
  • Rated 1 out of 5 stars
    3 minutes ago
    Small-fitting, stiff and uncomfortable

    I bought my regular size, however these thongs run way smaller than usual. The colors are nice but that l’s it for the positive; they are very stiff, they don’t have their usual elasticity and even after a few washes, they still dig in my hips and groin area. I’m very disappointed by this product.

    Christine L.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    19 hours ago
    Uncomfortable and not absorbent

    I wanted to love these - I've used period panties for years and thongs from another brand. I wanted to try Knix given the good reviews but these were awful. They hit in the wrong place, especially uncomfortable with period bloating. They were not very absorbent and they are already stained all over - from a light day. My other ones never had this issue. For what these cost, I'm so disappointed. After one wear they're getting thrown in the trash.

    Alex C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Comfortable

    Nice to look at and nice to wear

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

    Love comfort and color

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

    Love the color

    Elizabeth
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Very good underwear

    Very good product

    caroline L.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Poor Sizing

    These are cut way too small. I generally wear a large in my underwear, but I learned that I need to get XL in Knix. I have serval Knix thongs (XL) and very comfortable. I originally purchased these in XL; they were too small. Knix graciously exchanged them for XXL. These are still tight.

    Darlene A.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Light Leakproof Thong

    I love how these protect, feel and boost my confidence!

    Andrea P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Nice fit

    Love the color and how it fits

    amelia f.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 weeks ago
    Run small

    Run small. I usually wear a medium and these were very tight putting on and to wear.

    Leslie B.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    2 weeks ago
    Wouldn’t buy the pack

    These panties have no stretch in the waist band like the pairs I bought not in a package together. The mediums I bought as 1 pair fit as a medium but the 3 pack medium fits like a small.

    Sarah T.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Comfy, ,ight leakproof

    Excellent for those of us who are “of a certain age” and don’t care for bunching!

    Shawn M.
    Verified Buyer
    Was this helpful?