Your Bag

Your cart is empty

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

Suggestions

Top Picks

Super Leakproof® Dream Short

$40.80 USD
$48.00
15% off

Color: Tapestry Limited Edition

Revolution V-Neck Bra

$55.25 USD
$65.00
15% off

Color: Warm Sand

Uplift Push Up Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Black

Super Leakproof® Dream Boxer

$48.00 USD

Color: Dark Cherry Stripe Limited Edition

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

| Rose Noir
| Rose Noir
| Rose Noir
| Rose Noir
| 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: Rose Noir Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Get FREE Express Shipping on all orders $125+

Shipping

HOLIDAY SHIPPING

Give the gift of Knix! To receive your order by Dec 24th, please order by the following dates.

All States - Urban Centers (except Hawaii, Alaska)
Standard: Sunday, December 14
Express: Tuesday, December 17

Alaska, Hawaii & Rural
Standard: Wednesday, December 10
Express: Wednesday, December 10
Express shipping is unavailable for international orders:

Africa, Central/South America, and Caribbean
Standard: Wednesday, December 10

Asia, Australia, and New Zealand 
Standard: Thursday, December 11

Europe and the Middle East 
Standard: Thursday, December 11

United Kingdom, France, Germany, Netherlands, Switzerland, and Japan 
Standard: Monday, December 15

Please note: Weather conditions and carrier issues may cause delays. Delivery dates are not guaranteed.

Processing Time
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* USD = Free standard Shipping (4-8 business days)**
Expedited = $4.99 USD (3-6 business days)**

Orders under $100* USD = $7.99 USD Standard Shipping (4-8 days)**
Expedited = $9.99 USD (3-6 business days)**

*After discounts, before shipping and taxes. Processing times not included in estimates.
**Military Addresses Excluded. Standard Military Address Shipping = $10.00 USD (est. varies per location)
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.
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

| Rose Noir
| Rose Noir
| Rose Noir
| Rose Noir
| 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.

Holiday Top Picks

Shop All Arrow Right

Pointelle Lace Tank

$35.70 USD
$42.00
15% off

Color: Hush Limited Edition

Pointelle Sleep Short

$29.75 USD
$35.00
15% off

Color: Hush Limited Edition

Fuzzy Slippers

$32.30 USD
$38.00
15% off

Color: Black

Super Leakproof® Dream Boxer 2-Pack

From 
$82.00 USD
$96.00
Save $14

SculptRib™ Cotton Long Sleeve Top

$58.00 USD

Color: Black

SculptRib™ Cotton Midi Pencil Skirt

$68.00 USD

Color: Black

WingWoman Contour Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Black

Super Leakproof® Dream Short

$40.80 USD
$48.00
15% off

Color: Dark Cherry Limited Edition

4.1
Rated 4.1 out of 5 stars
Based on 207 reviews
Total 5 star reviews: 135 Total 4 star reviews: 20 Total 3 star reviews: 14 Total 2 star reviews: 13 Total 1 star reviews: 25
77%would recommend these products
ComfortRated 3.9 on a scale of 1 to 5
EffectivenessRated 4.0 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)
207 reviews
  • Rated 3 out of 5 stars
    3 minutes ago
    Different fit

    Don’t fit like they used to, this trio seems to also be a different fabric. Haven’t worn yet, but wished I sized up

    Nancy K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    My knix purchase

    I love them. Comfortable.

    Sandra C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Perfect !

    It’s been few years I am buying these and they are comfortable

    Christine G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Excellent alternative to a panty liner

    Very comfortable. Great option without a panty liner - doesn’t feel like you’re wear anything!

    Nicole F.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    2 days ago
    Disappointed

    Unfortunately I can’t wear these. I ordered 2 packs of these in size medium during the BF sale, thinking they would fit like my other Knox underwear. I was wrong, they’re too small to the extent of being very uncomfortable. I am bummed I can’t return them and I couldn’t exchange them either because size Large is out of stock. So now I have 6 pairs of expensive underwear I can’t wear :(

    Megan
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    4 days ago
    Not the best fit

    The material of this thong is not as stretchy as the other Knix thong styles and so my usual size (L) was too tight and unfortunately not very flattering.

    Heather C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Comfortable and effective

    I initially bought these for use at the gym. They are very comfortable and effective

    Susanna P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    What you want in a period thong

    This is the best of both worlds — absorbent and seamless

    Alexis W.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    6 days ago
    Tighter than normal

    I always wear a large in Knix thongs.

    The fabric on these has significantly less give and feels constricting. I would go up in size if you really wanted these.

    Sydney M.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    leaky, baggy, uncomfortable

    I would not recommend this brand. They leak every time, the protective pad goes too far up and not low enough. They bag out, and if you want to wear leggings, don’t, looks like you’re wearing a diaper. Pretty disappointing all around. Care has much more comfortable options, and no leaks ever!

    Megan M.
    Verified Reviewer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Fits a bit small

    Get one size up from your regular size and it should be perfect

    Allison B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Love love love

    My go to for my light days of my period. Bonus is the color is super cute

    Megan H.
    Verified Buyer
    Was this helpful?