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Scarlet Period Brief + Swim BFFs Set
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 Underwear Laundry Bag | Lightweight mesh delicates washing bag
Scarlet Period Underwear Laundry Bag | Lightweight mesh delicates washing bag
Scarlet Period Brief + Swim BFFs Set
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 Underwear Laundry Bag | Lightweight mesh delicates washing bag
Scarlet Period Underwear Laundry Bag | Lightweight mesh delicates washing bag

Brief + Swim Set

Land to water. One solution.

$65.00 $76.00

One for the water, one for after. The Swim Brief holds around a tampon's worth, the organic cotton Bikini takes over on dry land.

    Swim Brief for water, Bikini after
    Swim Brief for water, Bikini after
    Leak-proof swim lining
    Leak-proof swim lining
    PFAS-free, lab tested
    PFAS-free, lab tested
    Free AU shipping $80+
    Free AU shipping $80+
Scarlet Period Bikini Brief (Size)
Scarlet Period Bikini Brief (Style)
Scarlet Period High-Waisted Swim Bikini Brief (Size)

⭐ 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 Moderate (5 teaspoons).

⭐ Laundry Bag: Designed to help protect period underwear and other delicates through every wash cycle.

✨ 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.

⭐ 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.

✨ 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!

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.

Size Chart

Size chart for Brief + Swim Set
Scarlet Period Brief + Swim BFFs Set

Brief + Swim Set

$65.00 $76.00
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Scarlet Period Bikini Brief and Swim Bikini Brief

Period Swim That Won’t Cramp Your Style.

Breaststroke? Freestyle? Doggy paddle? Whatever your stroke, one pair of Period Swimwear will help you lap with confidence.

Our High-Waisted Swim Bikini Brief is leak-proof and fast-absorbing, so you can dive into anything - pool, beach, or backyard sprinkler - minus the stress (or tampon strings).

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

Your Questions, Answered

How does Period Swim work?

Scarlet Period Swimwear features a multi-layered leak-proof technology that absorbs and contains fluid. An added waterproof inner layer then works to stop any menstrual fluid from leaking out, and water from getting in. Click to read more on the magic of Period Swimwear.

How do I store them post-swim

We recommend travelling with a water-resistant travel bag such as our Toiletry Bag. Give them a good rinse to remove any chlorine or salt water, before stashing away. Once home, either machine wash in cold water with mild detergent or if wearing them again soon, hang them out to fully dry (the sunnier the better). 

Are they easy to wash?

After use, give them a good rinse in cold water to remove any chlorine or salt water. 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

Do I need to wear a cup, tampon, or pad too?

Depending on the absorbency you choose and the heaviness of your flow, you can wear our period undies on their own or as backup along with a Period Cup or tampon.

What does the absorbency level mean?

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

Light: Holds up to 3 teaspoons, equal to 2 regular tampons or one pad. For light days, drips and discharge. Try: G-String or Bikini Brief in Light-Moderate

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

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

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.
★★★★★

"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

Real advice for real cycle days