Skip to content

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

Light Leakproof UltraThin No-Show Thong

$27.00 USD

Buy 3+ Save 15%, Buy 5+ Save 20%

Absorbs about 2 regular tampons

Invisible under clothes

More absorbency without bulk

Machine washable

Ashley has 39“ hips wearing KNIX S | Indigo

Ashley has 39“ hips wearing KNIX S

| Indigo
Ashley has 39“ hips wearing KNIX S | Indigo

Ashley has 39“ hips wearing KNIX S

Ashley has 39“ hips wearing KNIX S | Indigo

Ashley has 39“ hips wearing KNIX S

Ashley has 39“ hips wearing KNIX S | Indigo

Ashley has 39“ hips wearing KNIX S

| General
| General
| General
| General

Ashley has 39“ hips wearing KNIX S

Color: Indigo Limited Edition

Size:

True to Size

Size:

Size and Fit Guide

Build Your 3-Pack

Light Leakproof UltraThin No-Show Thong

Color: Indigo Limited Edition

Size:

Size:

Light Leakproof UltraThin No-Show Thong

Color: Indigo Limited Edition

Size:

Size:

Light Leakproof UltraThin No-Show Thong

Color: Indigo Limited Edition

Size:

Size:

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.

First Pair Risk Free for 30 Days

Leakproof Underwear, Risk Free

Returns & Exchanges

New to leakproof? Your first pair is risk free for 30 days. Wear them, wash them, and see how they work for your body. Not right for you? We'll refund the item price (original shipping excluded). Prefer a different size or style? We also offer free exchanges. Just email info@knix.com and we'll take care of you.

Purchased leakproof before? Within 30 days of delivery you can exchange for another size, style, or store credit. We're unable to provide refunds on underwear. If you ordered multiple pairs, please open, wash, and wear one pair only before initiating an exchange.

Still have questions? View our full policy here.

Rewards Members Earn 27 Points

Product Description

Made with our signature buttery soft fabric, this leakproof thong has absorbency without the bulk. Great for leak protection, the ultra-thin liner absorbs about the same as 2 regular tampons or 2 pantyliners worth. Our patented 360 LeakSeal™ technology locks in leaks at every edge.

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

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

Ashley has 39“ hips wearing KNIX S | Indigo
| Indigo
Ashley has 39“ hips wearing KNIX S | Indigo
Ashley has 39“ hips wearing KNIX S | Indigo
Ashley has 39“ hips wearing KNIX S | Indigo
| General
| General
| 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
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

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

4.0
Rated 4.0 out of 5 stars
Based on 261 reviews
Total 5 star reviews: 165 Total 4 star reviews: 22 Total 3 star reviews: 21 Total 2 star reviews: 15 Total 1 star reviews: 38
What our customers are saying
Customers say these leakproof thongs offer good protection and comfort for light days, gym wear, and everyday use. Many reviews mention significant sizing inconsistencies, with most recommending sizing up at least one size from usual underwear sizes. Common feedback includes concerns about stiff material and tight fit, particularly around the waistband and edges. While some find the fabric less stretchy than expected, others praise the seamless design and confidence it provides. Frequent comments address the protective gusset placement, with mixed experiences on coverage effectiveness. Reviews are divided on durability and comfort after washing.
74%would recommend these products
FitRated -0.2 on a scale of minus 2 to 2
ComfortRated 3.9 on a scale of 1 to 5
EffectivenessRated 4.1 on a scale of 1 to 5
Keywords
Keywords
Rating
Ratings
Height
Height
Pant Size
Pant Size
Usage
Usage
Pant Size Purchased
Pant Size Purchased
261 reviews
  • Rated 5 out of 5 stars
    3 hours ago
    Pretty and functional!

    Excellent quality, fit perfect and does the job!

    Olivia B.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    2 days ago
    Mystery Bag Love

    I love a good mystery bag! Brings the inner child out of me. Love the thongs. Their comfy. 10/10 recommend. The bras are just as comfy.

    Samantha W.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    5 days ago
    Anazing

    The best, so comfortable.

    Katie N.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    6 days ago
    Things

    Amazing I never want to take them off

    Katie S.
    Verified Buyer
    Reviewing
    POS - Light Leakproof UltraThin No-Show Thong - Last Call
  • Rated 1 out of 5 stars
    1 week ago
    Great concept, poor execution

    I had high hopes for this product. Unfortunately. I was disappointed by the comfort. Sizing runs small and the absorbent gusset is stiff and awkward , even after multiple washes. Between these and a panty liner, the old school method is a more comfortable option.

    Haley W.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 3 out of 5 stars
    2 weeks ago
    They are ok

    I bought the matching bra. Although I like wearing a thong normally this one is odd. It feels more like a diaper. Not sure why it was designed that way.

    Carolyn R.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    3 weeks ago
    These are great!

    Very comfortable and good moisture control for sweat, leaks and period back up.

    Rochelle B.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    I love the many options for your needs and how comfortable everything is.

    Brenda
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    1 month ago
    A must have!

    The rise is great for lower rise pants. They fit like a second skin and stay in place all day. They wash up great, and are quick to air dry. These and the high rise version are the only underwear I wear now!

    Jessica A.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 5 out of 5 stars
    1 month ago
    Thong

    I didn’t think you could get much leakage coverage from a thong but I think they did the best they could with it. It’s more than I thought it could be. Glad I gave them a try.

    MD
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong
  • Rated 4 out of 5 stars
    1 month ago
    Love the colour

    Fits snugly for a medium

    Janice M.
    Verified Buyer
    Reviewing
    POS - Light Leakproof UltraThin No-Show Thong (Zskus)
  • Rated 5 out of 5 stars
    1 month ago
    LOVE THESE

    Wow, these are a gift made from women, for women! No leaks, used on my day 3-5 of my period with no additional products. LOVE!

    Sara R.
    Verified Buyer
    Reviewing
    Light Leakproof UltraThin No-Show Thong

Your underwear questions, answered.