Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period High-Waisted Swim Bikini Brief | Light Absorbency, flattering high waist
Scarlet Period High-Waisted Swim Bikini Brief | Light Absorbency, flattering high waist
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Waterproof Toiletry Bag | Perfect wet swimmers and undies!
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period High-Waisted Swim Bikini Brief | Light Absorbency, flattering high waist
Scarlet Period High-Waisted Swim Bikini Brief | Light Absorbency, flattering high waist
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Waterproof Toiletry Bag | Perfect wet swimmers and undies!

Scarlet Period Brief + Swim BFFs Set

$78.00 $86.00

Leak-proof protection for swimming

We'll keep this brief. High-Waisted Swim Bikini Briefs for swimming. Period Bikini Briefs for living. Leak-proof protection, always. Buy the set, save $8.

  • Chemical-free (no PFAS!)
    Chemical-free (no PFAS!)
  • Save with Sets
    Save with Sets
  • Stylish and ultra-flattering fit
    Stylish and ultra-flattering fit
  • Leak-proof swim protection
    Leak-proof swim protection
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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Why You’ll Love It

⭐ Leak-Proof Swim Bikini Brief: Holds up to 2 teaspoons (1 regular tampon) for secure, water-ready coverage.

⭐ Period Bikini Brief: Soft organic cotton with built-in absorbency, available in Light (3 teaspoons) and Medium (5 teaspoons).

⭐ Toiletry Bag: This discreet, waterproof storage bag is perfect for carrying undies, cups, and swimmers.

Easy Care, Zero Fuss

✨ Rinse in Cold Water: To keep them fresh, rinse in cold water until the water runs clear after wearing them.

✨ 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

⭐ Recycled & Organic Fabrics: Swim Shorts are 90% recycled polyester; Boyshorts are 95% GOTS-certified organic cotton.

⭐ Move with You: A touch of spandex (5–10%) adds stretch for freedom and all-day comfort.

⭐ Quick-Dry Technology: Built-in polyester gussets in both styles wick moisture fast to keep you dry and leak-free.

⭐ PFAS-Free & Lab-Tested: No hidden nasties - independently tested and safe for your skin.

⭐ Thoughtfully Engineered Layers: Multiple absorbent layers built into the gusset, without added bulk.

Size & Fit

✨ Fit Note: Our underwear and swim 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.

Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag
Scarlet Period Brief + Swim BFFs Set | Bikini Brief, Period Swim Brief & Waterproof Bag

Scarlet Period Brief + Swim BFFs Set

$78.00 $86.00
IN THE MEDIA
IN THE PRESS
Models wearing Scarlet Period Swim Bikini Brief

Period Swim That Won’t Cramp Your Style.

Breaststroke? Freestyle? Doggy paddle? There are different strokes for different folks, but just one pair of Period Swimwear to help you lap with confidence.

Our High-Waisted Swim Bikini Brief is made with fast-absorbing, leak-proof technology. So you can hit the pool, the beach, the waterfall, and even the backyard sprinkler without stress, stains, or tampon strings poking out.

  • Looks like normal swimwear
  • Zero leaks, zero worries
  • Made with 90% recycled material
  • Chemical treatment-free, including PFAS
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★★★★★

"This bikini bottom from Scarlet is made from a ribbed fabric with a leak-proof gusset and a sleek high-waist. Swim in peace this summer."

- Vogue

★★★★★

"Scarlet creates stylish and timeless leak-proof swimwear so you can go about your summer without disruption."

Now to Love

★★★★★

"You can get active in the water without worrying about leakage."

Elle magazine

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 rae Heat Pad is slim, rechargeable, and built to fit your life.

Period Heat

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

Learn More

Your questions, answered

HOW DO THEY WORK?

Scarlet Period Swim and Underwear both feature multi-layered built-in leak-proof technology that absorbs and contains fluid. Our swimwear also has an added waterproof inner layer that stops any menstrual fluid from leaking out and water from getting in.

Click to read more about how Period Underwear works and the magic of Period Swimwear.

WHAT DOES THE ABSORBENCY LEVELS MEAN?

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

Light: Holds up to 3 teaspoons, which is equal to 2 regular tampons or 1 pad. This is for light days to save you from pesky drips, discharge, and lighter flows. Try: G-String, Bikini Brief in Level 1 or Swim range

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

Heavy: Holds up to 7 teaspoons, which is around 4 regular tampons or 3 pads. Our heavy hitter makes them great for full-flow days and overnight. Try: Boyshort or Period Cup

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

Depending on the heaviness of your flow, you can wear on their own or as backup protection with a Period Cup on moderate to heavy days. 

If you plan on swimming, we recommend travelling with a water-resistant travel bag, such as our Toiletry Bag, along with your clean pair so you can easily and cleanly do a switcheroo.

If you are feeling Cup curious, you can click to learn more about how Period Cups work. They’re really not as scary as you think!

DO I HAVE TO WASH THEM ASAP AFTER USE?

Some people like to rinse their underwear in the shower before throwing it into a Laundry Bag for wash day, while others don’t. Rinsing your underwear in the shower won’t affect its lifespan. When it comes to swimwear, it’s always best to give it a good rinse to remove any chlorine or salt water before stashing it in a water-resistant travel bag such as our Toiletry Bag until you get home.

Then, once you are ready, simply toss them in on a cold wash cycle with mild detergent (no bleach!). DW, your other clothes will be just fine! For drying, you have two options: tumble dry on low or hang them out to dry in the sun. 

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.

HOW DO I STORE THEM POST-SWIM?

We recommend travelling with a water-resistant travel bag, such as our Toiletry Bag, along with your clean pair so you can easily and cleanly do a switcheroo.

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. Please make sure to check both our numeric and letter sizes so there is no confusion (e.g., our large is a 12).

When in doubt, we advise you to size up. Still confused? You can email us for help at support@scarletperiod.com.

Question
Question

Customer Reviews

Based on 14 reviews
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(14)
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A
Amy C
So comfy

Didn’t expect them to be so soft.

P
Penelope Rowe
Not bulky at all!

Looks like normal swimwear, really no diff to my normal bottom

R
Ruby Johnson
Nice

I wouldn't wear on own but they just add peace of mind

C
Celeste McKenzie
Comfortable Fit

The material is soft (says it's recycled) and so comfy don't even think on my period.

D
Debbie Mack
Great idea

I double up with their cup

123
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