Three women wearing Fri Period underwear

THE COMFIEST, NON-TOXIC

Period Underwear

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4.9 out of 5 | Loved by 1000+ customers

Clean. Comfy. Leakproof.

OEKO-TEX certified fabrics

Holds 3+ tampons worth

Reusable for 2+ years

OEKO-TEX certified fabrics

Holds 3+ tampons worth

Reusable for 2+ years

Customer fave

Classic Period Brief

$29.00

Ultimate period comfort

Cute yet powerful

Buy 4+, Get FREE SHIPPING + SAVE 20%
Free Size Exchange On First Order
Hassle-Free Returns
Buy 4+, Get FREE SHIPPING + SAVE 20%
Free Size Exchange On First Order
Hassle-Free Returns

Buy 4+, Get FREE SHIPPING + SAVE 20%
Free Size Exchange On First Order
Hassle-Free Returns
Buy 4+, Get FREE SHIPPING + SAVE 20%
Free Size Exchange On First Order
Hassle-Free Returns

Buy 4+, Get FREE SHIPPING + SAVE 20%
Free Size Exchange On First Order
Hassle-Free Returns

Buy 4+, Get FREE SHIPPING + SAVE 20%
Free Size Exchange On First Order
Hassle-Free Returns

Woman wearing a white sweatshirt and Fri Period underwear against a white wall.

Person taking a mirror selfie wearing Fri Period's Low-rise Period Hipsters

Person wearing a patterned shirt and Fri Period boxer briefs, standing in a room with a chair and plant.

Person wearing a leopard print shirt and Fri Period Boxers indoors.

Money-Back Guarantee

1000+ happy customers can't be wrong. But just in case you're not completely satisfied with your purchase, we've got your back.

Care for your underwear

Shop our range of accessories designed to help extend the life of your period underwear

Strucket Mini - Period Underwear Wash & Soak System

$36.95

Travel essential

Waterproof Wet Bag

$22.00

Don't just take it from us

★★★★★
I've tried several brands of period underwear, but this one really stood out. The coverage was noticeably better, offering more security—especially on heavier days. The fabric felt like higher quality compared to others I've used, soft yet durable, and it held up well after washing. It offered reliable protection without sacrificing comfort or style.
Havva
Perth, Australia

★★★★★
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, thanks to these classic briefs from Fri Period! 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
Palo Alto, CA

★★★★★
I'd been wanting to try period underwear and then a friend got me these. I was nervous at first but they absolutely do the job and are so comfy to wear. Washing is easy and they come out like new each time. Plus the print is really cute. I'm def gonna get more!
Noela
Houston, TX

★★★★★
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

★★★★★
I waited to go through two cycles prior to reviewing. I wore the underwear on both a medium/light day, as well as on a heavy day. They are very comfortable and held everything in with no leaking. They are easy to care for and washed well. It is great to purchase a sustainable product that is also packaged in sustainable, compostable packaging! I will definitely be purchasing again!
Megan
California

★★★★★
I bought a pair of these for heavy flow days and they were just what I needed - especially for night time as they are so comfortable and no need to worry about leakage! I've used re-usable pads before, but these definitely work better in terms of comfort, duration of use, and they look great! They are easy to wash too.
Lara G

★★★★★
I absolutely love these period panties! I ordered a medium and they fit perfectly. I was able to wear them overnight and throughout the day without any worry. They are very comfortable and keep you dry. I 100% recommend these. I will be purchasing more!
Novi J
Houston, TX

★★★★★
The product is awesome. I was holding off providing a review because I wanted to see how absorbent it was... turns out, I couldn't tell, because it's so incredibly absorbent!!!! They are miles comfier and cooler than modibody, which I had before.
Helen
Townsville, QLD

★★★★★
I've only had to use these once so far so hopefully I'm not jumping the gun on a 5 star review...my last cycle wasn't quite as heavy as usual...HOWEVER, the absorption seemed VERY good. Usually after a whole day of wearing my Thinx, while they absorb pretty good, I tend to leak out the sides a bit. The gussets in my thinx don't do a great job of keeping fluids directed away from the clothes you're wearing; I felt like I was constantly transferring blood onto the insides of the pants or shorts I was wearing. I did NOT have that problem once in these. Also, SUPER comfortable.
Amber H.
USA

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

Organic Period Underwear That Works As Hard As You Do

Say goodbye to synthetic nasties—like PFAS and other unregulated chemicals—and hello to next-level comfort. Our organic period underwear is crafted from sustainable fabrics like organic cotton and bamboo—because your body and the planet deserve the best.

Designed to be leakproof, breathable, and PFAS-free, these undies aren’t just cute—they're conscious.

Whether you're on your heaviest flow day or just want peace of mind overnight, Fri Period has your back (and your front). It's time to ditch the landfill-bound pads and tampons for good.

Ready to upgrade from your regular underwear? These are the sustainable, affordable period panties you’ve been waiting for—reusable, eco-friendly, and made with love.

Why Choose Organic Period Underwear from Fri Period?

Gentle on You: Made with organic, non-toxic fabrics that keep irritation away—even on your most sensitive days. We avoid harmful chemicals and stick to OEKO-TEX certified fabrics to keep things safe and breathable.

Seriously Sustainable: Reusable, washable, and made to last. Our underwear helps reduce landfill waste without sacrificing performance. They’re made with organic materials and designed to be the eco-friendly, reusable period underwear products you actually want to wear.

Designed by People Who Get It: We know periods. That’s why we’ve designed every pair to feel like your favourite undies—with way more superpowers. Whether it’s a backup option or your go-to for heavy flow, these are your sweatpants of period undies—pure, everyday comfort.

Curious about how our leakproof tech works? Read our deep-dive here. Want to know why being PFAS-free matters? This blog breaks it down in plain speak.

Let’s make your period easier, comfier, and a lot more planet-friendly. Shop our collection now and feel the Fri Period difference—designed for people with periods, and trusted by those who want affordable period underwear materials that don’t skimp on quality. For care tips and replacement guidance, check out our FAQs.

FAQs

Rinse in cold water, machine wash on a low-temp cycle, then hang or lay flat to dry. It's super easy!

Nope, Fri Period underwear feels just like your comfiest cotton undies.

The high-tech layers are thin but work in unison for powerful period absorbency!

Absolutely. Our period underwear is designed to handle heavy flow days with ease—no leaks, no stress. The absorbent layer and waterproof layer give you leakproof period protection even on your toughest days.

With proper care, they’ll last up to 2 years or more.

That’s a lot of periods saved from landfills and a smart choice for budget-friendly options.

We offer a free size-exchange for our first-time customers. Because when it comes to your period, comfort is everything!

Still have questions?

You can read our responses to more Frequently Asked Questions here: FAQs