• 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

  • 1 Tree Planted For Every Pair

  • Women-Owned

  • Secure Payment

  • Hassle-Free Returns

Three women wearing Fri Period underwear Three women wearing Fri Period underwear

A Cleaner, Comfier & More Sustainable Period

ORGANIC COTTON & BAMBOO PERIOD UNDERWEAR

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Excellent 4.9 | 1000'S of Happy Periods

Free from toxic nasties

Ships from Aus

Curling bicep icon

Designed to last

Free from toxic nasties

Ships from Aus

Curling bicep icon

Designed to last

Customer fave
Classic Period Brief - Fri Period - Organic Cotton and Bamboo
Classic Period Brief - Fri Period underwear - Suitable for women of all shapes and sizes
Classic Period Brief
$29.00
Ultimate period comfort
Period Boxers - Fri Period
Period Boxers - Fri Period
Period Boxers
$34.00
Cute yet powerful
Low - Rise Hipster - Fri Period
Low - Rise Hipster - Fri Period
Low-Rise Hipster
$27.00
Travel essential
Waterproof 2L washbag - Fri Period
Waterproof 2L washbag - Fri Period
Waterproof Wet Bag
$22.00

Gorgeous Printed Gusset

Say Bye to Stain Stress!

Better For Your Body

And For The Planet!

Easy Care

Simply Wear, Wash, Repeat!

Period game-changer

Say goodbye to period stress with soft, breathable & high-performing period undies that actually work.

Shop Period Undies →
Postpartum woman wearing Fri Period underwear with key features pointed out

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
WA
★★★★★

I'm so glad I have these a go - I've tried other brands but these are by far the comfiest. The fabric is so soft and I love how the absorbent part goes all the way up the front and back - it feels seamless and nixes the chance of leaking. I love that I can use these as a standalone period product and don't need to keep any back-ups.

Kirsten
QLD
★★★★★

Love! Forget I'm wearing anything but holds it all in and I've got quite a heavy flow. Washing was easier than I thought and I love how I always have them to hand and can just throw them on when my period's due.

Helen
VIC

As Seen In

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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.

Read More →

The finer details

If you're not happy with your Fri Period underwear, we'll do what we can to make it right. We're here to make periods easier after all.

Our founder is based in WA, and all the orders are shipped directly from our Australian headquarters.

Sizes XS to 3XL available

Orders are typically shipped within 2 business days (although in most cases within 1 business day). We use Australia Post and charge a flat rate of $9.95. We'll throw in free shipping if you spend over $100.

Period Underwear Australia

Ready to say goodbye to period stress? Fri Period brings Australia its award-winning, ultra-comfy period undies—designed for real bodies and real flows.

With maximum protection and a moisture-wicking top layer, every pair of period underwear gives you peace of mind from light flows to heavy flow days, and everything in between.

Made with natural, breathable fabric, our period undies are kind to your skin and kind to the planet! They feel just like your regular underwear (only comfier!).

And the best part? Though we started in the US, we're an Aussie-founded brand (Nina, our co-founder lives in Perth), here to serve your cycle with planet-friendly period wear that feels like a second skin. Join thousands of people across the country choosing affordable, eco-conscious period solutions that work.

Why Fri Period Could Just Be Australia’s Favourite Period Underwear

  • Leakproof technology: Our leak-proof system offers maximum protection and absorbs menstrual fluid with ease. Each pair does the work of up to 3 regular tampons or pads. 
  • Planet over plastic: Reusable, washable, and made from eco-friendly fabrics that are designed to last. Just wash on a cold cycle (avoid bleach or fabric softener).
  • Feels like nothing: Breathable and soft for all-day comfort, even on your heaviest days. You'll honestly forget you’re not in regular undies.

Our wide range offers options for every phase of your period care routine. Whether it's moderate flow, heavy periods, or just peace of mind on-the-go, we’ve got you covered.

And if you’re unsure about sizing, we’ve got a detailed fit guide to help you pick the correct size for your needs.

So go on—join the sustainable cycle revolution. Your period (and the planet) will thank you.

🩷 Explore the full collection of affordable period underwear now
🤔 New to period undies? First-Time Period Underwear Users: What to Expect