Skip to content Accessibility Statement

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
Restocked

Super Leakproof® Dream Boxer™

$48.00 USD

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

Absorbs about 7-8 super tampons

Built in leakproof underwear

Optimal overnight protection

OEKO-TEX® Certified

Machine washable

Front view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit

Sarah has 38.5” hips and wears KNIX M

Super Leakproof® Dream Boxer™ shown front-facing against a light gray background
Back view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit

Sarah has 38.5” hips and wears KNIX M

Text on Image: No leaks to interrupt sleep. No more stained sheets. Super soft, pajama-style fit
Full-body view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit

Sarah has 38.5” hips and wears KNIX M

Text on Image: Absorbs about 7-9 super tampons worth. 360 LeakSeal™ technology traps leaks
Text on Image: Loose fit boxer with built-in brief
Text on Image: An extra-long 13-14.5" gusset to help keep anything from leaking through

Sarah has 38.5” hips and wears KNIX M

Color: Black

Size:

Relaxed Fit

•

Size:

Size and Fit Guide

Delayed Shipping: Midnight/Cherry Polka Dot and Red/White Stripe begin shipping between Nov 11-13

Build Your 3-Pack

Front view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit

Super Leakproof® Dream Boxer™

Color: Black

Size:

Size:

Front view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit

Super Leakproof® Dream Boxer™

Color: Black

Size:

Size:

Front view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit

Super Leakproof® Dream Boxer™

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

Holiday Return Policy
Eligible items purchased online or in stores between November 2, 2026 and December 31, 2026 may be returned through January 29, 2027. All other purchases fall under our 30 day Returns Policy.

Standard Return Policy
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 48 Points

1 Dream Boxer™ is sold every 3 minutes

No wonder we've sold out 5x times

Product Description

The comfort of a boxer with the power of a pad. The Super Leakproof Dream Boxer offers a relaxed, non-restrictive fit that makes it the perfect choice for lounging and sleeping. Whether you’re managing a heavy period, postpartum recovery, or light bladder leaks, the high-rise waistband and soft-touch fabric provide a supportive feel without digging in. Designed to replace bulky pads and liners, these absorbent boxer briefs offer a solution for your monthly cycle. Available in inclusive sizes XS to 4XL.

Comfort-First Fit

Combining a loose-fitting boxer with an internal brief for discreet Leakproof protection. Designed to be worn as both loungewear and overnight protection.

Worry-Free Protection

Designed with a built-in leakproof liner that fits snug to the body, it helps lock in leaks from every angle, even as you toss and turn.

Heavy Absorbency

Absorbs up to 8 super tampons. Great for heavy flow days, overnight protection, and light bladder leaks.

Easy to Wash

Machine washable, just like your regular underwear.

Zoom

Sarah has 38.5” hips and wears KNIX M | Front view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit | Black
Sarah has 38.5” hips and wears KNIX M | Back view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit | Black
Sarah has 38.5” hips and wears KNIX M | Full-body view of model wearing the Super Leakproof® Dream Boxer™ highlighting the coverage and fit | Black

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

How it Compares

Why Our Customers Love it

FRESH FIX TECHNOLOGY®

Built-in protection that feels like nothing at all.

So you feel fresh and in-control.

Our patented 360 LeakSeal™ technology helps lock in leaks from every angle, even if you toss and turn. The internal brief absorbs about 7-9 super tampons worth of liquid, and it’s our heaviest absorbency yet.

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 581 reviews
88%would recommend these products
FitRated 0.1 on a scale of minus 2 to 2
ComfortRated 4.6 on a scale of 1 to 5
EffectivenessRated 4.6 on a scale of 1 to 5
Keywords
Keywords
Rating
Ratings
Height
Height
How do you use your Leakproof?
How do you use your Leakproof?
Usual Pant Size
Usual Pant Size
581 reviews
  • Rated 2 out of 5 stars
    3 minutes ago
    Not for thick thighs

    I ordered my regular size and would expect sleep shorts to give some room, but these are TIGHT around my thighs. Super uncomfortable.

    CN
    Courtnay N.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    12 hours ago
    Best purchase ever

    Fit fantastic love the color fast shipping good price

    IS
    Ilene S.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    2 days ago
    It was a gift and it was very well received

    It was a gift for my daughter and it was very appreciated

    MJ
    marie j. c.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™ Kit*
  • Rated 5 out of 5 stars
    3 days ago
    Great for teens

    My daughter loves these and they make her moon time more comfortable. Sizing is accurate 100lb 5”1’ fits a size S well.

    AZ
    Annie Z.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    3 days ago
    Excellent

    Excellent

    AK
    Alex K.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    4 days ago
    Easy choice

    The shorts themselves fit wonderfully and I love the coverage. More importantly I am blown away by how easy it was to navigate a replacement in the correct size. This was my first order from Knix and I’ve recently lost quite a bit of weight so picking a size was a challenge from a comfort standpoint. I would say it’s true to size but notably different from other brands is the waist band is not overly tight compared to the rest of the garment, I don’t feel pinched or uncomfortable even when bloated.

    AH
    Alison H.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    5 days ago
    Favorite boxers!

    These are so nice for heavy days on my period overnight! I feel comfortable only wearing this which I can’t say about even other Knix Boxers

    SC
    Sadie C.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    5 days ago
    So comfy!

    These are the most comfortable underwear, even more so than most of my regular pairs. It’s made me almost excited to have my period so I can be comfortable all day.

    EW
    Erin W.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    6 days ago
    Super cute & comforting

    Loved these! They will be perfect for my heavy days when im bloated and dont want to wear anything tight!

    KD Profile picture for Kayla D.
    Kayla D.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    6 days ago
    I wish I discovered these sooner!

    I was a bit hesitant for several reasons. I was worried if they really would work as described and have no leakage and I was also quite worried about putting them in the washing machine and whether any damage would be done or staining of other items. I did plenty of research and at first started slow by buying one daytime pair and one nighttime pair just to test effectiveness, comfort, etc. I loved them. No more worrying if I have a tampon in my purse or whether it is the right absorbency for what I need. I track my cycle and know what days I need to wear these. I’m also very impressed with how absorbent they are and how many tampon equivalent amounts they can hold. This allows me to sleep through the night or not have to step out of work worried my tampon may have leaked. I will say they are a bit pricey if you plan to buy everything you would need for a whole week’s menstruation, but I would say I purchased enough nighttime and daytime styles over the course of two cycles by using bundling or discount codes, etc. and now I no longer need to purchase any products from the pharmacy or find out that I’ve run out of product exactly when I need it. I know these will always be in my drawer and I’m very happy that I have them. I wish these were around when I was a teen because this must be so convenient for them as well as providing added confidence that they are well protected. I just wish I bought these sooner!

    JC
    Jennifer C.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™ Kit*
  • Rated 5 out of 5 stars
    6 days ago
    Perfect

    Incredibly comfortable, just what you want while on your cycle. They don’t feel like they will leak, and don’t squeeze too tight.

    BH
    Brittany H.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™
  • Rated 5 out of 5 stars
    1 week ago
    Love them!

    I really enjoyed wearing these, they’re so comfortable and absorbent if that’s what you’re looking for.

    TS
    Tay S.
    Verified Buyer
    Reviewing
    Super Leakproof® Dream Boxer™

Your underwear questions, answered.