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Period underwear that looks as good as it feels!
Scarlet Period Underwear Bikini Brief
With breathable, soft organic cotton, our Bikini Brief is stylish and leaf-proof.
Scarlet Period Bikini Brief side view
The Scarlet Period Bikini Brief (moderate) is the perfect everyday period underwear in a classic mid-rise silhouette that delivers moderate period protection.
Scarlet Period Bikini Brief Size Chart
Scarlet Period Underwear Absorbency Guide

Scarlet Period Bikini Brief

Available in Light and Moderate

eqv. 2 tampons

Period underwear that looks as good as it feels! With breathable, soft organic cotton, our Bikini Brief is stylish and leak-proof.

  • Fast-absorbing
    Fast-absorbing
  • Leak-proof
    Leak-proof
  • Comfy & Body safe
    Comfy & Body safe
  • Machine washable
    Machine washable
  • Odour-free
    Odour free
  • Stylish & Discreet
    Stylish & Discreet
Upgrade your order
Stay dry with a Scarlet Period Waterproof Toiletry Bag +$10
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Item will be included
Shop now to try risk-free for 30 days

We promise you'll love them or we'll give your money back!

DETAILS

Designed for ultimate comfort, protection and performance, the Scarlet Period Bikini Brief is the perfect everyday period underwear in a classic mid-rise silhouette. 

With fast-absorbing 4-layer technology that wicks away moisture, and absorbs and contains fluid to keep you dry during your period, you can bleed, wash and wear on repeat.

The Moderate Days Bundle
Available in Light and Moderate
NEED TO KNOW

Machine washable and reusable, they’re an eco-friendly and cost-effective alternative to disposable pads and tampons. After use, rinse in cold water until it runs clear. Machine wash cold with mild detergent, do not use bleach or fabric softener. Line dry or tumble dry on low.


You can pick your Absorbency Level:

Light - can absorb 3 teaspoons of fluid (which is roughly equal to 2 regular tampons or 1 regular pad), making them ideal for lighter days, or as back up protection on heavy days.

Moderate - can absorb 5 teaspoons of fluid (which is roughly equal to 3 regular tampons or 2 regular pads), making them ideal for back up protection during your heavier days, or on its own on moderate ones. 

MADE FROM

95% Organic Cotton, 5% Elastane and a Polyester/Elastane/ PUL Quick Dry Gusset. Free from added chemical treatments, including PFAS - understand more (independently lab tested).

GOOD FOR YOU & THE PLANET

Did you know more than 12 *billion* pads and 7 *billion* tampons are thrown out every year. The average person with a period uses 11,000 pads, tampons and panty liners in their lifetime. By switching to Scarlet, you're supporting a period and planet positive future.

Scarlet is a proud member of 1% for the Planet, joining a global community of brands and individuals giving back to the environment.

REVIEWS
Reviews
IN THE MEDIA
IN THE PRESS

Everyday period undies that feel like, well, normal undies

Today's schedule: gym, work, drinks, dinner, date. There's no time for stains and leaks.

Our Bikini Brief offers hours of leak-proof protection. Made with breathable and buttery soft organic cotton, it's period underwear that feels like you're wearing, well, regular underwear.

Super soft GOTS Certified Organic Cotton
Chemical treatment-free, including PFAS
Available in Light or Moderate absorbency
Light absorbs the equivalent of 2 tampons or 1 pad
Moderate absorbs the equivalent of 3 tampons or 2 pads
ORDER NOW

Your questions, answered

HOW DO THEY WORK?

Scarlet Period Underwear is designed to fit like normal underwear, and feature a multi-layered leak-proof technology that wicks away moisture, absorbs and contains fluid to keep you dry and protected. 

The built in leak-proof technology is harder working than disposable pads which means it can safely hold more liquid, and last for years not hours. Loved by all, you can read some reviews.

WHAT DO THE DIFFERENT ABSORBENCY LEVELS MEAN?

Super Light: Holds up to 1 teaspoon, which is equal less than 1 regular tampons or 1 liner. It’s the perfect everyday underwear for light leaks and discharge, even when you’re not on your period.

Light: Holds up to 3 teaspoons, which is equal to 2 regular tampons or 1 pad, making them perfect for saving you from pesky drips, discharge, and lighter flows.

Moderate: Holds up to 5 teaspoons, which is equal to 3 regular tampons or 2 pads. Wear on moderate dates, or as extra defence on heavy days with our Period Cup. 

Heavy: Holds up to 7 teaspoons, which is equal to 4 regular tampons or 3 pads, making them great to wear on their own, day or night. 

DO I NEED TO WEAR A CUP, TAMPON OR LINER TOO?

Depending on the absorbency level you choose and the heaviness of your flow, you can wear our period panties on their own or as backup protection along with a Period Cup or tampon. Take the time to explore a routine that works for you.

HOW DO I WASH THEM?

After use, rinse them in cold water (we recommend in the shower) until they run clear. Then, machine wash in cold water with mild detergent (no bleach!). Try our Laundry Bag to safeguard them on laundry day. Then just hang out to dry (the sunnier the better) or tumble dry on low - that’s it! 

If it’s your first wear, pop them in the washing machine with your next cold cycle - washing them before wearing activates their absorbency even more.

WHAT IS YOUR 30-DAY RISK-FREE TRIAL? 

This is a new way to period, and we understand fit may take a couple of goes to get into the swing of things. So, we have a 30-day risk-free trial to support you to find the perfect pair. Basically, if it’s your first time shopping with us and you’re not happy with your product, you may be eligible to claim a refund on that product, even if it’s used. Just email us at support@scarletperiod.com.

HOW DO I PICK THE RIGHT SIZE FOR ME?

We get it — sizing for bottoms is anything but standardised. Which is why this size guide will help break it down for you. For extra ass-urance, make sure to whip out your trusty measuring tape. (Most likely stashed at the bottom of your junk drawer.) Make sure to check both our numeric or letter sizing so no confusion (ie. Our large is a 12). And when in doubt, feedback tells us better to size up.

Still confused? Click for more information on our Returns Policy and our 30-Day Trial Policy. You can also email us at support@scarletperiod.com.

"These seriously feel like real underwear. Super comfy and lightweight. LOVE." 

Hana

"So comfy, wash well, are clean, enviro friendly and solve an issue really well. I always thought the idea of period pants was gross but I'm 110% a fan now. Have tried heaps of brands and these are the best by far. Awesome customer service too."

Kate S.

"Sizing is spot on, material is beautiful and they're comfy AF. These look and feel great when you don't."

Maggie C.

"Amazing product. Great fit and comfortable"

Tracy H.

"Honestly, when I think back to my old self a few periods ago WITHOUT the everyday brief, I pity her."

Kate H.

"I've used a few different brands of period underwear and I love how these look smooth and fit comfortably. I can wear any pair of pants and still feel good. They are also easy to wash and the quality feels good so far."

Marlay B.

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