"Comfy and casual and won’t make you feel like you’re wearing a giant nappy. They’re for a moderate to heavy flow so they should take around three tampons."
Available in Light and Moderate 
Period underwear that looks as good as it feels! With breathable, soft organic cotton, our Bikini Brief is stylish and leak-proof.
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.
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.
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).
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.
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.
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.
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.
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.
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.
We recommend travelling with a water-resistant travel bag such as the Scarlet Toiletry Bag, along with a spare pair, so you can always pop them away and rinse when you're home if you need to.
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Measure your waist and hip as per the line to find the right size for you.
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| AUS | 6 (XS) | 8 (S) | 10 (M) | 12 (L) | 14 (XL) | 16 (XXL) |
| US | 2 | 4 | 6 | 8 | 10 | 12 |
| UK | 6 | 8 | 10 | 12 | 14 | 16 |
| EU | 34 | 36 | 38 | 40 | 42 | 44 |
| Waist | 61 | 66 | 71 | 76 | 81 | 86 |
| Hip | 86-88 | 89-91 | 94-96 | 99-101 | 104-106 | 109-111 |
