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The Heavy Days Bundle
The Heavy Days Bundle - High Waisted on model
The Heavy Days Bundle - High Waisted
The Heavy Days Bundle - Boyshort on model
Boyshort offers great overnight leakproof protection
The Heavy Days Bundle - Boyshort
The Heavy Days Bundle Absorbency Guide
The Heavy Days Bundle Size CHart

The Heavy Days Bundle


eqv. 4 tampons

Designed for those days when even sneezing feels disastrous. Our Heavy Days Bundle has you covered and comfy with hours of leak-proof protection.
  • Free Shipping over $65
    Free Shipping over $65
  • Save with Sets
    Save with Sets
  • Fast-absorbing
  • Machine Washable
    Machine Washable

The Scarlet Heavy Days Bundle has been designed for those days when even sneezing feels disastrous. Our Heavy Days Bundle has you covered and comfy with hours of leak-proof protection thanks to 1 x Boyshort and 1 x High-Waisted Brief.

Our easy-fitting Boyshort provides full coverage and 7 teaspoons of fluid protection for heavier flow days. You also get the perfect all-rounder, the Scarlet Period High-Waisted Brief. Featuring a quick-drying thin but absorbent built-in gusset that doesn't feel wet or bulky in a comfy high-waisted style, they absorb up to 5 teaspoons of fluid, while looking super cute.

Scarlet Period G-String

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.


BOYSHORT: 95% Organic Cotton, 5% Spandex, and a Polyester/PUL Quick Dry Gusset. 

HIGH-WAISTED: 45% Modal, 45% Cotton, 10% Spandex, and a Polyester Quick Dry Gusset. 

All Scarlet underwear is free from added chemical treatments, including PFAS (independently lab tested).


Harder working than disposable pads and tampons, they last for year 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.


"These are the most comfortable and easy to move in period undies."

Ali K.

"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

Your questions, answered


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.


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


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


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


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

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