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Super Leakproof® Cotton Boxer Brief

$42.00 USD

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

Absorbs about 6 super tampons

Breathable cotton

More absorbency without bulk

Machine washable

Color: Lavender Limited Edition

Size:

True to Size

Size:

Size and Fit Guide

Build Your 3-Pack

Super Leakproof® Cotton Boxer Brief

Color: Lavender Limited Edition

Size:

Size:

Super Leakproof® Cotton Boxer Brief

Color: Lavender Limited Edition

Size:

Size:

Super Leakproof® Cotton Boxer Brief

Color: Lavender Limited Edition

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

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 42 Points

Comfort-First Fit

Boxer shorts with a mid-to-high rise and maximum bum coverage.

Heavy Absorbency

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

Cozy Cotton-Blend

Soft cotton with a hint of spandex feels luxurious against your skin.

Worry-Free Protection

An innovative floating gusset provides leak protection from every angle.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Lavender
| Lavender
| Lavender
| Lavender
| 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
Super Leakproof® Cotton Boxer Brief

Comfort that goes beyond your cycle

FRESH FIX TECHNOLOGY®

Cotton meets patented protection.

A sewn-in, floating liner soaks up about 6 super tampons’ worth of liquid—so you stay fresh, comfortable, and in control.

Soft Top Layer

Gently wicks away moisture to keep you fresh and odor-free.

3.2
Rated 3.2 out of 5 stars
Based on 33 reviews
Total 5 star reviews: 13 Total 4 star reviews: 2 Total 3 star reviews: 4 Total 2 star reviews: 5 Total 1 star reviews: 9
45%would recommend this product
FitRated 0.1 on a scale of minus 2 to 2
ComfortRated 3.4 on a scale of 1 to 5
EffectivenessRated 2.9 on a scale of 1 to 5
Keywords
Keywords
Rating
Ratings
Height
Height
Pant Size
Pant Size
Usage
Usage
Pant Size Purchased
Pant Size Purchased
33 reviews
  • Rated 1 out of 5 stars
    4 minutes ago
    1 Star

    Small very small

    Andrea
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 1 out of 5 stars
    2 days ago
    1 Star

    The band is thin and uncomfortable, the middle is not seen in so it wads up and moves around, therefore leaks. Also the back stitch seam is across the middle of your bum so if you have a iob where you sit, it hurts.

    This is not good period underwear and superleakproof is comical.

    Kristy
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 5 out of 5 stars
    3 days ago
    Comfy and works perfectly!

    Couldn't be happier. Theyre so soft and breathable.

    Fiona P.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 1 out of 5 stars
    3 days ago
    Disappointing

    The absorbent portion of the underwear is not built into the underwear like the other knix products I have. It is attached only at each end, not the sides, so it moves around constantly causing leaks. The pad also doesn’t seem to fit properly in the underwear, and because it’s not built in, feels like you are wearing a bulky diaper. I own several pairs of the dream shorts and they are excellent, but would not recommend these.

    A R.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 1 out of 5 stars
    1 week ago
    Poor gusset design

    The gusset is only sewn in on the edges so the gusset creeps, binds, climbs, bunches. I wore these for under a half an hour before taking them off. It feels like I am wearing a rogue pad. I may try to cut the gusset out - the boxer itself is comfortable. I would lot recommend this current design to anyone.

    karen d.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 1 out of 5 stars
    1 week ago
    So uncomfortable

    The outer boxer is very comfortable but the leakproof crotch gusset is a horrible design. I bought two pair f these boxers, washed them before wearing, and air dried them. I put on one pair and wore them for fifteen minutes before tossing both pair in the trash. The gusset is not sewn into the crotch. It is attached only on the ends so it basically is loose , acting like a pad with no adhesive… it bunches, creeps, and binds. Wearing these boxers is as comfortable as stuffing a wad of Kleenex in my pants. I would recommend these only to people I loathe.

    Carole
    Verified Reviewer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 3 out of 5 stars
    1 week ago
    They changed

    These changed from my previous order. The "crotch" is separate from the panties themselves. Not a good move

    Marian L.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 2 out of 5 stars
    1 week ago
    Not leakproof

    I liked the cotton fabric and the fit was comfy but the floating gusset doesn't stay in place and I had leaks within the first 5 minutes of wearing them.

    Karyne H.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 3 out of 5 stars
    1 week ago
    Okay

    Found the legs too short and the liner did not stay in place as well.

    Cassandra P.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 5 out of 5 stars
    1 week ago
    Cotton boxer shorts

    Excellent. Really comfy

    Maureen L.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 1 out of 5 stars
    1 week ago
    Please Beware of the "Floating Gusset"

    I was super excited for these underwear after I gained some weight and my other bikini style period underwear started cutting into my legs in an uncomfortable way. I literally JUST got my period yesterday and so far I have stained 2/3 of my pairs because of the "innovative" floating gusset which I hd no knowledge of before purchasing. I truly am baffled why anyone would design period underwear in a way where the absorbent pad portion just moves around freely like when you put a wad of toilet paper in your pants in a pinch. There is no way a person with a period designed this; I wasn't even on my heaviest day and I already stained two pairs of the lavender color (which I was also excited about). I'd give these 10/10 for comfort and appearance and 0/10 for functionality. I'd be better off wearing regular boxer briefs with a pad (which I often do and NEVER have leaks). The back of the absorbency pad also doesn't go up far enough in the back. I may just sew the sides of the gusset to get my money's worth but for the price this is insanely disappointing and I won't be buying any more pairs unless they fix these issues.

    Danielle
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief
  • Rated 1 out of 5 stars
    2 weeks ago
    No absorption at all

    Not one drop was absorbed. Immediately bled through not even 15 minutes into wearing them.

    And for the high price not worth it.

    Alexandra A.
    Verified Buyer
    Reviewing
    Super Leakproof® Cotton Boxer Brief

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