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.

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

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!

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.

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.

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.