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New & Improved

Super Leakproof® No-Show Boyshort

$29.00 USD

Mix, Match & Save: 3+ for $25 each
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Now absorbs about 6 super tampons

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2" added to gusset for extra protection

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Invisible under clothes

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Machine washable

Megan has 36.5” hips and wears KNIX S | Black

Megan has 36.5” hips and wears KNIX S

| Black
Megan has 36.5” hips and wears KNIX S | Black

Megan has 36.5” hips and wears KNIX S

Megan has 36.5” hips and wears KNIX S | Black

Megan has 36.5” hips and wears KNIX S

| General

Megan has 36.5” hips and wears KNIX S

Color: Black

Size:

True to Size

Size:

Size and Fit Guide

Build Your 3-Pack

Megan has 36.5” hips and wears KNIX S | Black

Super Leakproof® No-Show Boyshort

Color: Black

Size:

Size:

Megan has 36.5” hips and wears KNIX S | Black

Super Leakproof® No-Show Boyshort

Color: Black

Size:

Size:

Megan has 36.5” hips and wears KNIX S | Black

Super Leakproof® No-Show Boyshort

Color: Black

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

Leakproof Underwear, Risk Free
Trying leakproof underwear for the first time? Your first pair is completely risk free for 30 days. Wear them, wash them, and see how they work for your body. If they’re not right for you, we’ll refund your first pair. Prefer a different size or style? We also offer free exchanges.

How it works:

  • Risk free applies to leakproof underwear on your first order
  • Refund covers the item price (original shipping excluded)
  • Just email info@knix.com and we’ll take care of you

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 29 Points

"I love these. I feel more secure when wearing them. I just don’t worry about being out anymore."

- Charlene M. | Verified Reviewer

Product Description

The ultimate "no-worry" period essential. Experience the comfort of a soft, stretchy boyshort with the powerhouse protection of Knix Super Leakproof technology. These boyshorts are engineered to replace disposable pads and liners, offering a sustainable solution that keeps you dry and fresh. The high-performance, moisture-wicking fabric and anti-odor technology make them ideal for all-day wear or a restful night’s sleep. Experience seamless period protection in a silhouette that never digs in or rolls up.

Comfort-First Fit

Boyshort silhouette with a mid-rise fit and extra hip and bum coverage.

Worry-Free Protection

Patented bonded edges help prevent side leaks.

Heavy Absorbency

Absorbs 6 Super tampons worth of liquid—perfect for heavy flow days, overnight protection, and light bladder leaks.

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

Megan has 36.5” hips and wears KNIX S | Black
| Black
Megan has 36.5” hips and wears KNIX S | Black
Megan has 36.5” hips and wears KNIX S | Black
| 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
PATENTED LEAKPROOF TECHNOLOGY

Built-in protection that feels like nothing at all

Our original Fresh Fix Technology® features a built-in absorbent liner absorbing about 3-6 super tampons worth of liquid so you feel fresh and in-control.

Soft Top Layer

Soft Top Layer

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

4.6
Rated 4.6 out of 5 stars
Based on 3,999 reviews
Total 5 star reviews: 3.1k Total 4 star reviews: 493 Total 3 star reviews: 149 Total 2 star reviews: 104 Total 1 star reviews: 110
93%would recommend these products
FitRated 0.0 on a scale of minus 2 to 2
ComfortRated 4.7 on a scale of 1 to 5
EffectivenessRated 4.6 on a scale of 1 to 5
Ease of UseRated 4.6 on a scale of 1 to 5
3,999 reviews
  • Rated 5 out of 5 stars
    Yesterday
    Very comfortable

    I wasn't expecting KNIX superleakproof boyshort to be so comfortable. It didn’t feel like I was in my period because of its absorbency. To top it off, it really was a no-show when I was wearing my leggings. It's a triple plus. Now, I am going to order more KNIX for daily wear.

    Czarina F.
    Verified Buyer
  • Rated 5 out of 5 stars
    Yesterday
    I’m free!

    Love wearing these all day, feeling secure, leakproof and free! I can pee without messing around with a tampon string and I’m saving coins not needing wholesale boxes of those suckers. Not to mention, these are incredibly comfortable compared to other brands!

    Hope F.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 week ago
    Super Leakproof No-show Boyshort -original

    Love the Boyshorts. Comfortable and they do the job well. Like all of your products , the quality is excellent, the fit is perfect and the Leakproof feature is real and effective.

    Kathy L. T.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 weeks ago
    Super leakproof no show boy short

    Very comfortable! Have no issues or accidents !

    Cheryl G.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Comfortable option

    Wore for first time and found them comfortable, stylish, and effective for light leaks.

    Donna R.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Love KNix

    I am so glad I found Knix. Every woman should try them.

    Trenna D.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Confortable, discreet and very reliable

    Fits well under clothes and provides great protection without feeling bulky.

    Raluca K.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    I love it!!! Hoping for medium leak coversge though

    DEBORAH
  • Rated 5 out of 5 stars
    2 months ago
    Boyshorts

    Comfortable and easy to wear with any outfit.

    Colleen M.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 months ago
    Love them

    Feel comfortable and protected for night wear

    Robin H.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 months ago
    5 Stars

    Great fit and they are confortable.

    Sandra
  • Rated 5 out of 5 stars
    2 months ago
    5 Stars

    Great fit and they are confortable.

    Sandra