The Boxer Brief Heavy (pre-order)
The Boxer Brief Heavy (pre-order)
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The Boxer Brief heavy is our classic boxer brief but with waaaaaay more absorption power. We designed this pair for folks with a heavy period … whether you struggle with PCOS, endometriosis, adenomyosis, fibroids, copper IUD, or just a heavy period, these were made for you!
You might be wondering: what makes these different from the The Boxer Brief? Well, the padding in these goes ___ inches higher in the front and ___ higher in the back, AND the absorption goes down the inside of the legs to make sure you’re safe from leaks.
Okay, now that we’ve chatted about the absorption, you might be worried these will look bulky or feel uncomfy. We made sure to take the same comfort consideration with these as our other boxers. They still feature our soft and stretchy waistband and ultra buttery recycled nylon fabric!When they are on, they look and feel like your favorite pair of underwear.
Say hello to the Boxer Brief Heavy. Ultra comfy and ready to help you tackle your heaviest days. <3
Want to learn more about the Boxer Brief? Check out our product page!
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how is it different from the regular boxer brief?
how is it different from the regular boxer brief?
the boxer brief heavy features a pad that goes up ___ inches higher in the front and ____ higher in the back and the extends down the legs. It is made to hold heavy flow where teh regular boxer brief is for light to moderate flow and a backup on heavy days!
why pre-order?
why pre-order?
As a small brand, we want to make sure we are creating products that our community actually wants while respecting our planet. Pre-order helps us gauge exactly how many folks actually want these so we can make sure we order just what we need and don’t over produce!
when can I expect my order?
when can I expect my order?
Pre-orders ship approximately late Aug/early Sept. We are making this first run to order to avoid overproduction ~ thanks for being part of how we do this sustainably and intentionally.
fabric + care
fabric + care
- Shell: 88% Recycled Nylon, 12% Spandex
- Lining: 95% Cotton, 5% Spandex
- Gusset: 75% Bamboo, 25% Polyester
impact
impact
Switching to period underwear helps divert 4 tampons/pads from landfills every day you choose to use them! (not to mention they save you $ in the long term.) Good for you + good for the planet.
design
design
We talked to 250+ people with periods before designing our underwear. These folks had heavy flows, light flows, endo, PCOS, gender dysphoria, cramping, and everything in between. Based on these conversations and surveys, here's what we did:
- Made an ultra stretchy waistband so you don't feel restricted while bloating
- Full length boxer to allow for gender inclusion
- Floating gusset so you can wrap a pad inside the underwear in case of emergency or preference
- Ultra thin pad, so they feel just like your favorite pair of underwear
Trust us, we got your back when it comes to periods. All day comfort informed by real people with real periods. ☁️
FAQs
FAQs
Still need some more info on our underwear? Check out our FAQs page or shoot as an email at hi@shopmonthly.co.

Planet-friendly
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ultra comfy
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low waste
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Gender-inclusive
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Our features
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Odor-resistant
Designed to keep you fresh with a cotton layer and bamboo blend for natural odor control
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Leak-proof
Our 4-layer gusset is ultra thin, but designed to absorb your flow and prevent leakage
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Absorbent
Our boxer brief holds about 25 ml of flow, which is equal to 1 menstrual cup, 3 super tampons, or 5 pads.
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Super stretchy
Ultra stretchy waistband and fabric that adapts to your body, offering a flexible fit that moves with you
Don't just take our word for it
This is my first time trying period underwear and I actually am obsessed, this changed the game!
-Rebe
These are so comfortable, I wear these even when I'm not on my period!
-Olivia
I've had my monthlies for about a year now, and I absolutely love them!
-Delilah
Wearing comfortable, cute, period undies helps you feel better
-Ada
I thought that menstrual underwear was the best it was going to get... until I tried monthly
-Peaches
monthly underwear helps me feel more confident in my body
-Aeja
Our customers are raving
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Our customers are raving
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Our customers are raving
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The best period panty on the market! I LOVE these! Finding a period panty that honors my postpartum body has been challenging. Until now. These boxer briefs are light, comfy, and give me the perfect hold without feeling restrictive. The black liner is genius! I will definitely be purchasing more to have multiple during my cycle.
-Chelsi L.
These Are GREAT!
I bought these for my daughter who just started her period. She prefers to wear boxer briefs and can be picky about how things fit. These hit the mark! She hasn't complained about them being uncomfortable and so far, we've had good luck with coverage. I have a couple pairs and love them, too! Also love they come packaged in recyclable material!
-Courtney K.
So Comfortable!!
I’m in love with this, I just bought another pair!
-Alexia M.
Best Underwear, Period (No Pun Intended)
LEGITIMATELY the most comfortable thing I've ever worn. They're lightweight, soft, breathable, they do NOT roll up on my thighs. You genuinely can't even feel that you're wearing them. They're absorbent, don't smell, and easy to wash and wear. I'm trans masculine and they're gender affirming and comfy and just so incredible. Would it be weird to wear them all the time????
-Chelsi L.
Amazing!
This is the absolute best period product that i've ever used. Super comfortable and I have never had any leakage. Would recommend 10 out of 10! :)
-Lena