Award-Winning Period Underwear

Name: Classic Period Brief
Brand: Fri Period
SKU: FB1-BK-XS
Price: 29.0 USD
Availability: InStock

Customer fave

Cute yet powerful

Ultimate period comfort

Period Boxers

$34.00

Non-toxic

OEKO-TEX certified fabrics

Icon showing Fri Period underwear's triple layer tech

Leak-proof

Holds 3+ tampons worth

Icon showing Fri Period underwear is eco friendly

Kinder

To your body & the planet

Non-toxic

OEKO-TEX certified fabrics

Leak-proof

Holds 3+ tampons worth

Kinder

To your body & the planet

Period accessories

Use on-the-go

Self-heating cramp soother

$6.00

Travel essential

Waterproof Wet Bag

$22.00

'Super comfortable and reliable... Amazing leak protection.'

Aaleeyah, TX

'I’m so grateful to discover this brand! I have been wearing period pants from other brands for years but have never found any that are perfectly leakproof — until now!'

Clare, CA

'The last thing I want on my period is more discomfort. This underwear has made this time of the month so much more comfortable.'

Rebecca, TX

'You can tell that the quality of these are so much better than other period underwear brands. They feel so much more comfortable and have more coverage.'

Grace, PA

Classic Period Brief - Fri Period - Rear view, full gusset coverage

Classic Period Brief - Fri Period - PFAS-free organic cotton+bamboo period underwear

Classic Period Brief - Fri Period - Period Underwear with a gusset that hides any stains

Fri Period - Period underwear in it's compostable and biodegradable packaging

A review of Classic Period Brief - Fri Period - A customer shares her testimonial

Classic Period Brief - Fri Period underwear sits high on the waist

Review of Classic Period Brief - Fri Period

$29.00

Shipping calculated at checkout.

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Read Our Latest Reviews

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

I've tried several brands of period underwear, but this one stood out. The coverage was noticeably better—especially on heavier days. The fabric felt like higher quality compared to others I've used.

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

The absorption seemed super good. SUPER comfortable. I am so happy I gave these a try because so far they are making me a really happy customer.

Amber H., USA

Havva T., Australia

I wanted a boxer style for overnight. These were the only brand I found that actually used cotton in the gusset, which was very important in my search. I absolutely LOVE these. I have been converted.

Michala Z., USA

For the first time in forever, I now have a reliable pair of period undies where I don’t need to have backup pads on hand. I can wear these with confidence all day long.

Frances B., USA

My period is pretty heavy and these did the job. They were comfortable and leak-free all day. Also really like wearing them at night as doesn’t “feel” like I’m wearing anything.

Noela B., Australia

Choose Better for the Planet

No Waste

Reusable for 2+ years

One Tree

Planted For Every Order

Recycling symbol in teal on a white background

Eco

Compostable packaging

No Waste

Reusable for 2+ years

One Tree

Planted For Every Order

Eco

Compostable packaging

Looking for period underwear that actually feels good? You’re in the right spot. This is our complete range—soft, breathable, and made for everyday comfort with absorbent gussets that work as hard as you do. Whether it’s your first time trying period panties or you’re switching from menstrual pads and other menstrual products, our designs make the change simple (you might even forget you're on your period, they're that comfy!)

Choose your style and enjoy leak prevention without the bulk.

Why choose Fri Period underwear?

Everyday‑soft organic cotton and bamboo (like a natural odor-busting and antibacterial treatment!)
Designed by textile engineers for superior absorbency speed
Completely reusable to replace all your single‑use period products (no more monthly trips to the period aisle!)

Helpful Guide + Reassurance

Still wondering if period underwear is right for you? Think of it like your favourite undies, but with an absorbent layer that manages menstrual blood effortlessly. From our bestseller - the Classic Super Brief to the best Period Boxers, our leakproof levels keep you covered—even through leak‑free nights. Each pair is crafted from organic cotton and absorbent fabrics, giving you 360 degrees coverage and a panty‑like fit.

Switching from menstrual cups, ultra thin pads, or even disposable period underwear? Our products are designed to give you the same peace of mind without the waste.

Not sure where to start? Get advice in our guide for first‑time period underwear users—from absorbent fabrics to finding your perfect fit. Or read our comfier period tips for making menstrual flow days easier.

Build your set today—Fri Period’s collection makes managing your cycle simple, sustainable, and comfortable.

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Period accessories

Classic Period Brief

FREE SHIPPING & 20% OFF!

Choose Better for the Planet

Why choose Fri Period underwear?

Helpful Guide + Reassurance