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Go With The Flow Kit - everything you need to survive day (and night) one.
Boyshort offers great overnight leakproof protection
Upgrade your period routine with our organic cotton Bikini Brief
Our Magnesium+ Spray will spritz bad vibes away
Comes with Laundry Bag

Scarlet Period Go With The Flow Kit

Survive day (and night) one

Bikini Brief for the streets. Boyshort for the sheets. And Magnesium Spray for every second in between. 

  • Free Shipping over $65
    Free Shipping over $65
  • Save with Sets
    Save with Sets
  • 30-Day Underwear Trial
    30-Day Underwear Trial
  • 1% for the planet
    1% for the planet

Bikini Brief for the streets. Boyshort for the sheets. And Magnesium Spray for every second in between. 

First up, the Bikini Brief is our best-selling organic cotton undies that look and feel like regular undies but offer 8 hours of leak-proof protection. Then you get our full-coverage Boyshorts that are soft, breathable, and highly absorbent to keep you comfortable and protected all night. Add to the mix our new Magnesium+ Spray - a fast-absorbing lavender and arnica-infused spritz that helps you (and your belly) relax in seconds. And finish it all off with a handy Laundry Bag and $14 savings!

Scarlet Period Reusable Period Cup
Survive day (and night) one

Scarlet Period Bikini Brief, Scarlet Period Boyshort, Scarlet Period Magnesium+ Spray and Scarlet Laundry Bag.


Machine washable and reusable, our Period Underwear is 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.


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.


"I’m genuinely blown away by how comfy they are and can’t believe I haven’t tried them out before!"

Annabelle K.

"Bought for granddaughter. Fast shipping, happy."

Kay B.

"Very happy with the product! Excellent quality, fast delivery. Thanks very much!!"

Victoria P.

Your questions, answered


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

Click to read more about how Period Underwear works.


When it comes to our periods, every flow is different. Heck, every day is different. Which is why we have a range of absorbency levels to suit. Use this as a guide to get the right fit for your flow, so you'll never stress about leaking on the train again.

Super Light: Holds up to 1 teaspoon, which is just a bit 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 Light 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 Moderate

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


We get it — sizing for bottoms is anything but standardised. Which is why this size guide will help break it down for you. For extra ass-urance, make sure to whip out your trusty measuring tape. (Most likely stashed at the bottom of your junk drawer.) 

Make sure to check both our numeric or letter sizing so no confusion (ie. Our large is a 12). And when in doubt, we advise to size up.

Still confused? Click for more information on our Returns Policy and our 30-Day Trial Policy. You can also email us at


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

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, we recommend air or line drying after washing – it's the VIP treatment for those absorbency layers. And if you must tumble dry, only bring LOW heat (double check, cause who has ever decoded dryer hieroglyphics?!).

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.

Why am I spraying magnesium. Can’t I just take a supplement?  

You sure can. However, we find that spraying magnesium on our bodies allows for direct absorption through the skin, bypassing our digestive systems and potential gastrointestinal issues associated with oral supplements. Spraying can offer quicker relief; however, the choice is totally up to you.

This product is scented. But isn’t perfume bad for skin?  

She’s a researched queen. Yes, perfume can be irritating. Which is why we don’t use synthetic perfumes, only natural fragrances that come from our lavender hydrosol. Because unlike synthetic fragrances, lavender hydrosol is pure, devoid of harmful chemicals, and retains the lavender plant's beneficial compounds.

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