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

Light Leakproof UltraThin No-Show Thong

$27.00 CAD

Mix & Match: 3+ for $20 each
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Absorbs about 2 regular tampons

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Invisible under clothes

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More absorbency without bulk

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Machine washable

Isabelle has 40” hips and wears a Knix size M | Sola

Isabelle has 40” hips and wears a Knix size M

Isabelle has 40” hips and wears a Knix size M | Sola

Isabelle has 40” hips and wears a Knix size M

Isabelle has 40” hips and wears a Knix size M | Sola

Isabelle has 40” hips and wears a Knix size M

| General
| General
| General
| General

Isabelle has 40” hips and wears a Knix size M

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: Sola

Size:

True to Size

•

Size:

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*
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.

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* CAD = Free Shipping (2-6 business days)
Orders under $100* CAD = $12 CAD Shipping (1-3 business days)
Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.
*After discounts, before shipping and taxes.
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

Isabelle has 40” hips and wears a Knix size M | Sola
Isabelle has 40” hips and wears a Knix size M | Sola
Isabelle has 40” hips and wears a Knix size M | Sola
| 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.

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4.1
Rated 4.1 out of 5 stars
Based on 204 reviews
Total 5 star reviews: 133 Total 4 star reviews: 20 Total 3 star reviews: 14 Total 2 star reviews: 12 Total 1 star reviews: 25
77%would recommend these products
ComfortRated 3.8 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)
204 reviews
  • Rated 5 out of 5 stars
    3 minutes 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
    11 hours 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
    17 hours ago
    3 Stars

    Was so excited for this. Beautiful colours! This fits smaller than other Knix mediums I’ve worn. They don’t fit me, and are too tight!

    Melissa
    Was this helpful?
  • Rated 3 out of 5 stars
    Yesterday
    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
    2 days ago
    1 Star

    In between sizes and a but tight on the waist.

    Savannah
    Was this helpful?
  • Rated 1 out of 5 stars
    3 days 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
    1 week 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
    1 week ago
    5 Stars

    Love them

    Stephanie
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    5 Stars

    Love them

    Stephanie
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    5 Stars

    Love them as always. Perfect every day wear for peace of mind and comfort.

    Stephanie
    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?
  • Rated 4 out of 5 stars
    2 weeks ago
    Pretty color not the right fit

    Maybe I am getting too old for thongs, however, these are pretty but not so comfortable. The plain pink color runs smaller than the print ones.

    Anne Z.
    Verified Buyer
    Was this helpful?