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 / French Cut Underwear / Leakproof UltraThin No-Show French Cut

Leakproof UltraThin No-Show French Cut

$27.00 USD

Mix & Match: 3+ for $25 each
Checkmark

Absorbs about 2.5 super tampons

Checkmark

Invisible under clothes

Checkmark

Moderate protection without the bulk

Checkmark

Machine washable

| Blue Light
| Blue Light
| Blue Light
| Blue Light
| General
| General
| General
| General
| General

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
Heavy
Drop
Drop
Drop
Drop
Drop
about 4-7 super tampons

Color: Blue Light 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

"They are so comfy I'm tempted to wear them even when I'm NOT bleeding!"

- Daily Mail

Comfort-First Fit

A classic mid-rise silhouette that provides medium 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

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

| Blue Light
| Blue Light
| Blue Light
| Blue Light
| General
| 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

4.4
Rated 4.4 out of 5 stars
Based on 536 reviews
Total 5 star reviews: 385 Total 4 star reviews: 67 Total 3 star reviews: 36 Total 2 star reviews: 16 Total 1 star reviews: 32
87%would recommend this product
ComfortRated 4.5 on a scale of 1 to 5
EffectivenessRated 4.4 on a scale of 1 to 5
FitRated 0.1 on a scale of minus 2 to 2
Ease of UseRated 4.6 on a scale of 1 to 5
Write a Review (Opens in a new window)
536 reviews
  • Rated 2 out of 5 stars
    6 hours ago
    2 Stars

    Feels like I'm wearing a pad instead of underwear. They do not lay flat as expected where the crotch padding meets the rest of the underwear. The French cut fit too high.

    Cindy
    Was this helpful?
  • Rated 1 out of 5 stars
    16 hours ago
    Not Leakproof

    I bought 3 pairs of underwear from knix: 1 french cut and 2 bikini. They are all the same size, and they all fit well. The 2 bikini style were perfect, but the french cut had a fair amount of leakage. I wore them for about eight hours while I slept, and I woke up to blood leaking out of the gusset. When I wore the bikini style overnight, I had no issues. I would not recommend the french cut style of underwear.

    Olivia
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    3 days ago
    Toss the rest. These are all you need. :)

    These are the first pair of period underwear I’ve tried. They come recommended and I’m glad I made the choice to order.

    I very much dislike tampons and pads. I used the diva cup for a while but…… I feel much better using these.

    Shauna H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Life changer

    This underwear is comfortable and functional! No worries about leaks or a need for disposable products. Wear and wash. I have worn these for several years now and will not go back.

    Diana K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    Good quality. Effective.

    Good quality, comfortable and not noticeable through pants.

    Denise B.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    Comfortable

    Fit nice, pretty comfortable.

    Holly B.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    4 Stars

    These are very comfy and soft but i do not think they hold the amount advertised. Ill def be wearing them as back up protection though!

    LINDSAY
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Pleasantly Surprised

    I am 5'3" and 150 lbs, normally a pant size 6-8, with a pear-shaped body. I ordered a medium. At first, it's a little snug, but as it stretched (as expected), I was pleasantly surprised at the fit. Nearly NO panty lines under leggings (even in the sun when I'm actively trying to find a panty line). Only a very slight occasional wedgie, considering the cut. I feel confident and comfortable in these and may be a new favorite. I was expecting the high cut to be more in the front, but it's definitely cut higher in the back, which I was surprised to find I like more. It's a french cut with appropriate front coverage.

    For all Knix leakproof underwear I've purchased recently, I wish the front liner went about 1" higher up in the front.

    Emily
    Verified Reviewer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    Elegant

    I ordered my regular size, but feel more comfortable going up a size to XL, which I ordered in the cotton 3 pack.

    Lil F.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    5 Stars

    Perfect for using under leotards for dance.

    Lori
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    Good product

    Very good product and comfortable. Does not look different than other underwear. A bit long to dry when washed.

    louise s.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 weeks ago
    Don’t love fit

    I have worn Soma High Leg panties for years and I was hoping these would fit similarly but they just don’t. The leg is too high and with the the leakproof liner it just makes them bunch up and move around… not flattering or comfortable.

    Amy Z.
    Verified Buyer
    Was this helpful?