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1 Tree Planted For Every Pair
Women-Owned
Secure Payment
Hassle-Free Returns

1 Tree Planted For Every Pair
Women-Owned
Secure Payment
Hassle-Free Returns
1 Tree Planted For Every Pair
Women-Owned
Secure Payment
Hassle-Free Returns

1 Tree Planted For Every Pair
Women-Owned
Secure Payment
Hassle-Free Returns

1 Tree Planted For Every Pair
Women-Owned
Secure Payment
Hassle-Free Returns

Three women wearing Fri Period underwear

A cleaner, comfier, more sustainable period

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

ORGANIC COTTON & BAMBOO PERIOD UNDERWEAR

SHOP NOW

Excellent 4.9 | 1000'S of Happy Periods

No more leak stress

Free from toxic nasties

Machine washable

No more leak stress

Free from toxic nasties

Machine washable

'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

'I absolutely LOVE these. I have been converted. I really worried that these would feel bulky or damp, but I really just feel like I'm wearing comfortable underwear. They are so much more comfortable than pads and feel much more secure.'

Michala, IN

'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. I highly recommend trying them.'

Grace, PA

You deserve better.

Fri is pronounced free, and that’s exactly how we want you to feel. We’re a women-owned brand on a mission to make period products cleaner, comfier and more planet-friendly.

Explore Collection

Explore a better period

Icon showing Fri Period underwear's triple layer tech

Leak Free

Each pair does the work of up to 3 tampons or pads, so you can feel confident all day (& night!) long.

Machine Washable

Simply wear, wash, repeat!

Breathable

Made from breathable organic cotton and bamboo

Clean & Non-toxic

Ethically made without using harmful chemicals like PFAS.

No Stain Stress

Printed gusset eliminates stains (and looks cute!).

Designed To Last

With proper care, your Fri Periods will last years.

Leak Free

Each pair does the work of up to 3 tampons or pads, so you can feel confident all day (& night!) long.

Machine Washable

Simply wear, wash, repeat!

Breathable

Made from breathable organic cotton and bamboo

Clean & Non-toxic

Ethically made without using harmful chemicals like PFAS.

No Stain Stress

Printed gusset eliminates stains (and looks cute!).

Designed To Last

With proper care, your Fri Periods will last years.

SHOP ALL

Hear from our community

"I feel comfortable and secure when I wear these, no matter how heavy my period is — and I haven’t had to contend with any leaks!"

Frances

I am blown away by the comfort of this underwear. They don’t feel bulky like some other brands do, and they’re so much better (and more secure) than wearing pads! I’m spreading the word about this brand. They’re a lot less expensive than other brands I’ve tried which didn’t perform as well.

Clare

"They are so much more comfortable than pads and feel much more secure. I highly, highly recommend!"

Michala

"I feel comfortable and secure when I wear these, no matter how heavy my period is — and I haven’t had to contend with any leaks!"

Frances

Clare

"They are so much more comfortable than pads and feel much more secure. I highly, highly recommend!"

Michala

"I feel comfortable and secure when I wear these, no matter how heavy my period is — and I haven’t had to contend with any leaks!"

Frances

Clare

"They are so much more comfortable than pads and feel much more secure. I highly, highly recommend!"

Michala

"I feel comfortable and secure when I wear these, no matter how heavy my period is — and I haven’t had to contend with any leaks!"

Frances

Clare

"They are so much more comfortable than pads and feel much more secure. I highly, highly recommend!"

Michala

"I feel comfortable and secure when I wear these, no matter how heavy my period is — and I haven’t had to contend with any leaks!"

Frances

Clare

"They are so much more comfortable than pads and feel much more secure. I highly, highly recommend!"

Michala

New to period underwear?

Fri Period underwear feels just like your regular (comfiest) underwear, but each pair does the work of several tampons or pads. Ethically made from natural, breathable fabrics, Fri Period will have you feeling fresh & confident (even on your heaviest flow days).

Click below for all the deets on how they work.

As Seen In

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

Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties Made without PFAS or other chemical nasties

Your Best Period Underwear

The go-to choice for anyone wanting ultra-soft, eco-friendly period panties that actually work. Crafted from breathable organic cotton and bamboo fabric, they feel amazing while keeping you dry, fresh, and comfy all day (& night!) long.

Our period briefs are designed for maximum absorbency and ultimate comfort — ideal for everyday wear and those moments where you need to feel like the best version of yourself.

Designed with your flow and lifestyle in mind, the Classic Brief is a game-changer in menstrual care. Whether you’re lounging at home, running errands, or powering through a busy work day, these briefs have got your back (& your front).

You'll Love Classic Period Briefs Because

Leakproof Protection: Multi-layer technology keeps moisture in check even on heavy flow days. Each pair does the work of 3 regular tampons or pads.
Sustainable Comfort: Made from the softest organic cotton and bamboo, these are better for your skin and the planet!
Reusable & Washable: These everyday underwear essentials are so easy to care for. Simply wear, wash, repeat!

This is comfort you’ll want to live in, not just during your period.

Shop now and experience your most comfortable cycle yet with our hardworking, super comfy & breathable undies.

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"Wearing these has changed my period"

Hard-working, extremely comfy and kind to your skin (& the planet!).

Try Our Classic Brief →

Fri Period's organic cotton period underwear

The female founders of Fri Period underwear with a customer

Our Story

With 1.8 billion of us menstruating each month, we're on a mission to make periods better - for you, and for the planet.

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A cleaner, comfier, more sustainable period

Classic Period Brief

Period Boxers

You deserve better.

Explore a better period

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Your Best Period Underwear

You'll Love Classic Period Briefs Because

"Wearing these has changed my period"

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