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Home / Boyshort Underwear / SuperPlus Leakproof® No-Show Boybrief
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SuperPlus Leakproof® No-Show Boybrief

$39.00 USD

Mix & Match: 3+ for $33 each
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Absorbs 7-11 super tampons

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Front-to-back liner

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Bonded seams prevent leaks

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Machine washable

Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

| Black
Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

| General

Ashley has 39” hips and wears KNIX S

Absorbency: Ultra

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

Color: Black

Size:

True to Size

•

Size:

Size and Fit Guide

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.
Easy Exchanges within 30 Days

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.

Ultimate Leakproof Protection

Our longest, most absorbent liner ever—front-to-back coverage without the bulk.

Day & Night Comfort

Buttery-soft stretch fabric moves with you, while bonded seams keep leaks contained and create a smooth, seamless look under clothing.

Machine Washable

Wash just like your regular underwear—easy, everyday care.

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Ashley has 39” hips and wears KNIX S | Black
| Black
Ashley has 39” hips and wears KNIX S | Black
Ashley has 39” hips and wears KNIX S | 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
PATENTED LEAKPROOF TECHNOLOGY

Our longest, most absorbent liner—ever.

Our original Fresh Fix Technology® features a built-in absorbent liner that soaks up about 7–11 super tampons’ worth of liquid—so you stay fresh, comfortable, and in control.

Soft Top Layer

Soft Top Layer

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

Our Best-Selling Underwear

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Super Leakproof® Dream Team Kit

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Super Leakproof® Dream Short

$48.00 USD

Color: Dark Cherry Limited Edition

SuperPlus Leakproof® No-Show High Rise

$39.00 USD
Mix & Match: 3+ for $33 each

Color: Black

Leakproof UltraThin No-Show High Rise

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Mix & Match: 3+ for $25 each

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Light Leakproof No-Show Bikini

$25.00 USD
Mix & Match: 3+ for $20 each

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Super Leakproof® Dream Boxer

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Leakproof UltraThin No-Show French Cut

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Essential No-Show High Rise 5-Pack

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Color: Cheetah Multi Limited Edition

4.1
Rated 4.1 out of 5 stars
Based on 25 reviews
Total 5 star reviews: 14 Total 4 star reviews: 5 Total 3 star reviews: 2 Total 2 star reviews: 2 Total 1 star reviews: 2
76%would recommend this product
Write a Review (Opens in a new window)
25 reviews
  • Rated 5 out of 5 stars
    2 days ago
    Excellent customer service and follow up

    Customer service is always prompt and responsive to reasonable requests.

    CJ W.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    2 days ago
    4 Stars

    Great fit. Love them.

    Judy
    Was this helpful?
  • Rated 1 out of 5 stars
    3 days ago
    1 Star

    I did not like the fit on these.

    Pamela
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Boy brown

    Really like these! Never tried this kind before.

    Deborah S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    Very protective

    Good comfort and great protection. Wish Knix did SuperPlus Leakproof in Dream Shorts as that'd be perfect for those special days.

    Diana
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Terrible cut

    Please add leak proof to the boy short. This cut is uncomfortable and I’ll never wear it. Total waste of money.

    Abbie S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Comfortable

    I love these

    Ariel S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    2 weeks ago
    Review.

    Boy brief. Want to try the brief. With a little bit of leg.

    Alice N.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 weeks ago
    High Front Liner is GREAT, Waistband Is Meh

    Been hoping for a front to back liner for a long time (specifically the front, that’s where all my leaks were happening), so that part is great. The waistband though isn’t as comfortable as their other period underwear… it digs in a bit and isn’t as comfortable. Hoping for a waistband update for future releases.

    Deanna M.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    3 weeks ago
    No-show boybrief

    They are very comfortable, but I think they come up to high on my waist.

    Heather A. H.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    3 weeks ago
    Catastrophic Failure

    I bought these believing they would be better for overnight than the super boy briefs and the super plus briefs. They worked fine while I was laying down the first night, but when I stood up I had a catastrophic failure and ended up with blood all down my leg and by the time I got downstairs to the bathroom it was dripping on the floor. They changed the cut at the bottom of the boy short so it’s more like the briefs so there is no forgiveness if they get shifted at all. I’m done trying to get overnight protection from this brand. I’ve tried and the money … oh the money, I could have bought 6 years worth or more of overnight pads and be farther ahead.

    Sally Z.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Great Fit

    These fit well and are super comfortable and protect against leaks. I am very happy.

    Jessica K.
    Verified Buyer
    Was this helpful?

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