Scarlet Period Bikini Brief | 3-Pack Leak-proof PFAS-free underwear + Laundry Bag
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet Period Underwear Laundry Bag | Lightweight mesh delicates washing bag
Scarlet Period Bikini Brief | 3-Pack Leak-proof PFAS-free underwear + Laundry Bag
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet PFAS-Free Period Bikini Brief – Stylish, Leak-Proof, Organic Cotton
Scarlet Period Underwear Laundry Bag | Lightweight mesh delicates washing bag

Scarlet Period Bikini Brief | 3-Pack

$76.00 $88.00

Available in Light and Moderate

Upgrade your period routine with our organic cotton Bikini Brief 3-pack and score a handy Laundry Delicates Bag. Buy the set, save $12.

  • Leak-Proof Protection
    Leak-Proof Protection
  • Two Absorbency Levels
    Two Absorbency Levels
  • Chemical-Free & Eco-Friendly
    Chemical-Free & Eco-Friendly
  • Organic Cotton Comfort
    Organic Cotton Comfort
Toiletry bag
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Stores all your goodies, like Cups, wet swimmers, and snacks. +$7 (save $3)
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Cup Wipes
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Makes cleaning both your Period Cup and the rae Heat Pad a breeze. +$5 (save $3)
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Laundry Bag
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Keep your undies safe with a Scarlet Period Laundry Bag +$7 (save $3)
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Period Pocket Underwear
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Add rae Period Pocket Underwear +$14
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Hand Wash
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Keep your Cup clean and fresh with our gentle wash +$5 (save $5)
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Hand Wash
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Keep your Cup clean and fresh with our gentle wash
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Why You’ll Love It

Meet the Scarlet Period Bikini Brief 3-Pack, your go-to for comfy, no-fuss period protection in a classic mid-rise cut.

⭐ Soft & Breathable Feel: Made from GOTS-certified Organic Cotton that’s gentle on skin and irritation-free.

⭐ Built-In Leak Protection: Fast-absorbing 4-layer gusset locks in moisture and keeps you dry.

⭐ Two Absorbency Options: Choose Light (3 tsp) or Moderate (5 tsp) to suit your flow.

⭐ Mid-Rise Everyday Fit: Classic cut that sits comfortably under outfits.

⭐ PFAS-Free & Chemical-Free: Independently tested for peace of mind.

⭐ Sustainable Period Solution: Reusable, washable, and planet-friendly.

Easy Care, Zero Fuss

✨ Rinse in Cold Water: After wearing, rinse in cold water until it runs clear to keep them fresh.

✨ Machine Wash Cold: Toss them in with mild detergent (no bleach or fabric softener, please).

✨ Dry with Ease: Line dry or tumble on low - no need for extra care.

✨ Need more info? Please read our complete guide to caring for your period underwear here.

Materials & Composition

✨ 95% GOTS Organic Cotton: Naturally soft and breathable, sustainably grown.

✨ 5% Spandex: For the perfect fit and stretch.

✨ Quick-Dry Gusset: Made from polyester/PUL, offering high absorbency for leak protection.

✨ PFAS-Free: No toxic chemicals here - because your body and the planet deserve better.

Size & Fit

✨ Fit Note: Our underwear runs on the slightly smaller side - if you're between sizes, size up.

✨ Teen-to-Adult Fit: Our sizing is unique - please refer to both the numerical (e.g. 10, 12) and letter sizing (e.g. M, L) in our guide.

✨ Australian Sizing: We use AU sizes - international customers, check our Size Guide.

✨ Still Unsure? Contact us for advice. We love a chat!

Planet-Friendly Practices

Did you know that over 12 billion pads and 7 billion tampons end up in landfills yearly? By choosing Scarlet, you're supporting a more sustainable future - where self-care and sustainability go hand in hand.

✨ High-Quality, Safe Fabrics: Made with care, free from PFAS and harmful chemicals, and independently lab-tested for your safety.

✨ Eco-Conscious Manufacturing: Crafted with a focus on quality and reducing environmental impact.

✨ Recyclable Packaging: Minimal waste for a cleaner world.

✨ 1% for the Planet: Scarlet is proud to contribute to environmental stewardship with every purchase.

IN THE MEDIA

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SCARLET BIKINI IS PERIOD PROOF

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 two absorbencies
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★★★★★

"Their mid-rise Period Bikini Brief is the perfect day-to-day option; available in nifty bundles to save some dough, too."

Harper’s Bazaar

★★★★★

"Comfortable, cost-effective and, dare I say, kind of cute."

Beauty Heaven

★★★★★

"Comfy and casual... won’t make you feel like you’re wearing a giant nappy."

Body and Soul

Your Questions, Answered

How do they work?

Scarlet Period Underwear is designed to fit like normal underwear and features multi-layered leak-proof technology that wicks away moisture, absorbs fluid, and contains it 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.

Do I need to wear a cup, tampon, or pad 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.

What does the absorbency level mean?

Super Light: Holds up to 1 teaspoon, which is equal to less than one regular tampon. Think of it as a new-age panty liner, so it’s great for spotting, light leaks and discharge. Try: Invisible Thong

Light: Holds up to 3 teaspoons, which is equal to 2 regular tampons or one pad. This is for light days to save you from pesky drips, discharge, and lighter flows. Try: G-String or Bikini Brief in Light-Moderate

Moderate: Holds up to 5 teaspoons, which is equal to 3 regular tampons or 2 pads. Go for this on moderate days or as extra defence on heavy days with our Period Cup. Try: High-Waisted Brief or Bikini Brief in Moderate-Heavy

Heavy: Holds up to 7 teaspoons, which is equal to 4 regular tampons or 3 pads. Our heavy hitters are great to wear on their own, day or night. Try: Boyshort or Period Cup

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!

TIP: 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?

We offer a 30-Day Risk-Free Trial for first-time shoppers for one pair of underwear. If you’re unsatisfied or have sizing concerns, 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. Make sure to check both our numeric and letter sizing so no confusion (ie. our large is a 12).

When in doubt, feedback tells us better to size up. Still confused? You can also email us for help at support@scarletperiod.com.

The Secret to Better Periods

Scarlet Period Bikini Brief - Available in Light & Moderate

Period Undies

Built-in period tech wicks away moisture to keep you dry and comfy.

Read More
Scarlet Period Cups offer 8 hours of freedom

Period Cups

The ultimate guide to folding, inserting, and removing your Period Cup.

Learn More
Scarlet Period High-Waisted Swim Bikini Brief | Light Absorbency, flattering high waist

Period Swim

Period Swim stops your flow from going out and water getting in. genius, huh!

Read More
Scarlet Period rae Heat Pad: Designed in Australia, built for period pain.

Period Heat

Meet rae, the self-care device created heat on the go and go with your flow.

Learn More

Customer Reviews

Based on 89 reviews
92%
(82)
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S
Sarah Kay
Feels like normal undies

Not bulky and nice material

P
Patty B
Super soft

Organic cotton is really nice and crutch isn't at all bulky like I was expecting. A+

A
Ann Adler
Perfect period undies

Soft and secure. 10/10.

C
Cass M

I appreciate the simple, no-frills design. LOVE that better for environment

D
Denae Blake
Good cut and nice

They’re discreet but mighty. The gusset isn’t super bulky like some brands I’ve tried. They wash well too. I did read to size up but I found them good size??

123
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