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Home / Shop All Teen / Teen Leakproof UltraThin No-Show Bikini
Best Seller

Teen Leakproof UltraThin No-Show Bikini

Teen bikini-cut period underwear with UltraThin liner.
$24.00 USD

Bundle & Save: 3 for $65
| Black
| Black
| Black
| Black
| Black
| General
| General
| Black
| Black
| General

Absorbency: Moderate

Moderate
Drop
Drop
Drop
Drop
Drop
about 2-4 super tampons
Light
Drop
Drop
Drop
Drop
Drop
about 1-3 regular tampons
Heavy
Drop
Drop
Drop
Drop
Drop
about 4-7 super tampons

Color: Black

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 24 Points

Comfort-First Fit

Bikini silhouette with a classic mid-rise fit, medium hip and 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 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.

Zoom

| Black
| Black
| Black
| Black
| Black
| General
| General
| Black
| 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
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.

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4.5
Rated 4.5 out of 5 stars
Based on 581 reviews
Total 5 star reviews: 441 Total 4 star reviews: 61 Total 3 star reviews: 33 Total 2 star reviews: 22 Total 1 star reviews: 24
89%would recommend these products
ComfortRated 4.5 on a scale of 1 to 5
FitRated -0.2 on a scale of minus 2 to 2
EffectivenessRated 4.5 on a scale of 1 to 5
Ease of UseRated 4.7 on a scale of 1 to 5
Write a Review (Opens in a new window)
581 reviews
  • Rated 5 out of 5 stars
    4 minutes ago
    Comfy

    I've been using Knix underwear for a few years now. They're very comfortable and are now my everyday underwear. I like that they are no-show.

    Julie G. K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 hours ago
    Love

    Very comfy!

    Robyn R.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    10 hours ago
    Runs on the small side.

    Normally take a medium so ordered these in the same size. Will need to exchange them though. Not enough material on the back!!

    Alison F.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    15 hours ago
    Comfortable

    Absolutely love them

    Mary P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    I LOVE this comfortable leaky proof panties! also safer for the environment by not putting liners in the garbage

    Fits well

    easy wash

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

    These are great, very thin and comfortable. Don't forget they are teen size, so they run smaller than regular women's size. Make sure to check size chart.

    Chantal B.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    3 days ago
    Sizing was inconsistent

    I’ve ordered similar in the past, but I found the medium this time smaller than the ones I ordered previously and much smaller than the medium cotton underwear (that I was very happy with) that I also purchased this time .

    Annette L.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    The Best!

    So comfortable and in fun colours! Can wait to buy more!

    Bev H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    Form and Function

    Comfy, cute and protective! What’s not to like?

    Shelly C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    Love!!!

    Knoxville are all i wear, they r the best!

    Melanie M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    Love Knix

    Love these underwear!! Knix is all I wear

    Melanie M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    5 Stars

    Very nice product, works well

    Elizabeth
    Was this helpful?