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Stay Covered, Stay Comfy: Scarlet Period Boyshorts Got You
Game-Changing Comfort for Heavy Flow Days: Scarlet Boyshorts
Comfort meets protection!
The Boyshort offers great overnight period protection
Scarlet Boyshort absorbs up to 7 teaspoons of fluid.
Boyshort Size Chart
Scarlet Period Underwear Absorbency Guide

Scarlet Period Boyshort


eqv. 4 tampons

Our best-selling, full-coverage Boyshort is crafted with soft, breathable organic cotton and high absorbency for overnight and heavy flow days.

  • Fast-absorbing
  • Leak-proof
  • Comfy & Body safe
    Comfy & Body safe
  • Machine washable
    Machine washable
  • Odour-free
    Odour free
  • Stylish & Discreet
    Stylish & Discreet
Upgrade your order
Keep your undies safe with a Scarlet Period Laundry Bag +$10
Item will be included
Shop now to try risk-free for 30 days

We promise you'll love them or we'll give your money back!


The Scarlet Period Boyshort is a best-seller for a reason. This easy fitting period underwear delivers full coverage protection during your heavier flow days. Wear like normal underwear, without worrying about leaks, stains or odours.

With naturally soft, comfy and breathable GOTS Certified Organic Cotton and a quick drying built-in absorbent gusset, the Boyshort will absorb up to 7 teaspoons of fluid (which is roughly equal to 4 regular tampons or 3 regular pads), making them great for overnight.

Scarlet Period Daily Cleanser (Scented)

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.

Read more about cleaning your Period Underwear


95% Organic Cotton, 5% Spandex, and a Polyester/PUL Quick Dry Gusset. Free from added chemical treatments, including PFAS (independently lab tested).


Harder working than disposable pads and tampons, our Period Underwear lasts for years not hours. 

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.


Designed for days when even sneezing feels disastrous.

Is there anything cuter than your butt in The Boyshort? (Hypothetical question.)

Our best-selling, full-coverage Boyshort has high absorbency for overnight and heavy flow days. Made with soft and breathable organic cotton for less sweat, more comfort, and movie marathons on the couch.

Zero leaks, zero worries
Super soft GOTS Certified Organic Cotton
Absorbs the equivalent of 4 tampons or 3 pads
Chemical treatment-free, including PFAS
Great overnight, however much you toss and turn

Your questions, answered


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


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.


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. Take the time to explore a routine that works for you.

On heavy days, we recommend travelling with a water-resistant travel bag such as the Toiletry Bag, along with a spare pair, so you can change them if needed, pop them straight away and rinse (if you CBF) when you get home.

And 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!


Nope – who’s that organised? That’s why our Laundry Bag is ace – simply throw your used pair into the bag and store for when you have a full load. Some people like to give them a quick rinse in the shower before popping into the bag, and others don’t. It won’t affect the lifespan of your underwear.

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.

Click to read more about how Period Underwear works


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


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

"I've tried a few brands of period undies and these are definitely the best! Absorbent, comfy, what more could you ask for!"

Casey H.

"Used to be quite skeptical about period pants, but they have completely changed the game to the point where I ALMOST look forward to getting to wear them!"

Mimi F.

"Sizing is spot on, material is beautiful and they're comfy AF. I no longer feel like a frump waddling around the house with a pad on in the granny knickers. These look and feel great when you don't."

Maggie C.

"Scarlet have very cute, comfortable, leak-proof, waste-free, non-toxic period underwear styles that are 100% cotton."

Ali Whittle

"The absorbency, I found was the hero of the product! And the material made it feel like there was no moisture when there definitely was. If that makes sense?"

Sarah W.

"The Boyshort are so comfy and they don’t dig in. I have a moderate-heavy flow, so I wear these to bed... I’m not worried about leakage!"

Cassarea J.

"I’m wearing my boyshort right now and love them so, so much. I found they’re the perfect match alongside my cup on heavy days."

Vanessa M.

"Comfort is key and these panties offer the ultimate meaning of comfort. Perfect for sleeping and even under my favourite pair of jeans"

Jade G.

"I love the whole range, because they’re literally so perfect for any time I need them. The boyshorts are my go-to! So comfy, I never want to take them off 😌."


"Thank you Scarlet for creating a earth friendly and yoga friendly period label! I’m obsessed with these Boyshorts."

Bonnee Fahlstrom

"Feeling cute and confident in Scarlet Boyshort. I love that these are created with soft, breathable organic cotton and high absorbency for overnight and heavy flow female days!"

Helena Vestergaard

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