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Home / Boyshort Underwear / Leakproof UltraThin No-Show Boybrief
Sale

Leakproof UltraThin No-Show Boybrief

$23.80 USD

$34.00

20-40% off
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Absorbs about 2.5 super tampons

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Invisible under clothes

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Moderate protection without the bulk

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Machine washable

| Cheetah Print
| Cheetah Print
| Cheetah Print
| Cheetah Print

Absorbency: Moderate

Moderate
Drop
Drop
Drop
Drop
Drop
about 2-4 super tampons
Ultra
Drop
Drop
Drop
Drop
Drop
about 7-11 super tampons

Color: Cheetah Print Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Free Shipping on orders $100+

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)
Year End Sale Return Policy

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.
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Comfort-First Fit

Mid-rise boybrief silhouette with full bum coverage for a smooth, comfortable fit.

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

| Cheetah Print
| Cheetah Print
| Cheetah Print
| Cheetah Print

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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4.8
Rated 4.8 out of 5 stars
Based on 69 reviews
Total 5 star reviews: 59 Total 4 star reviews: 5 Total 3 star reviews: 3 Total 2 star reviews: 2 Total 1 star reviews: 0
93%would recommend this product
Write a Review (Opens in a new window)
69 reviews
  • Rated 5 out of 5 stars
    22 seconds ago
    Boy Shorts!

    Love these. Comfortable and pretty. Boy shorts are my preferred panty and not offered everywhere, especially this comfortable.

    Lisa D.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    23 minutes ago
    Bot shorts

    I love Knix boy briefs. Comfortable and reassuring.

    Helen W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    8 hours ago
    Fit

    Love the way they fit

    Sherrie B.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    Yesterday
    Comfy and lightweight

    Comfy and lightweight. Some rolling at the waistband, but I probably could’ve sized up.

    Brenna G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    Ultra thin no show boy brief

    Great fit, super comfy and fun pattern

    Cyndi C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    5 Stars

    I've been using this brand for years. Won't ever go back to a regular pad or tampon.

    Antonio
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    Love the boybrief!

    I am so happy to have this new cut! My bum is rather flat so I hadn't received the coverage I desired until these (although I tried to make the briefs work). Thanks for making a style that offers better coverage for those of us who no longer strive to be flirty - as I complete my sixth decade on earth.

    HEIDI K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 days ago
    Comfy fit and does the trick!

    These are so comfy and I love how they fit. Not your traditional period panty.

    Morganne S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    No Show Boy-brief

    ⭐⭐⭐⭐⭐

    Bronwen W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    5 Stars

    Great fit and protection!

    Susan
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    Worry proof comfort

    Being a senior lady, I needed something comfortable & reliable for leaks. These are amazing & fit the requirements. So glad I found knix!

    Susan G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    Best Fit

    I love how Boybriefs fit. They've been my favorite for several years and the Leakproof Ultra Thin No-Show is a real plus for comfort and confidence. Thanks KNIX.

    Ann L.
    Verified Buyer
    Was this helpful?