Home/Scarlet Period | Set + Save/Go With The Flow Set
Scarlet Period Go With The Flow Kit | Bikini Brief, Boyshort, Magnesium+ Spray
Scarlet Period Boyshort – PFAS-free, Heavy overnight absorbency, Organic Cotton
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Boyshort – PFAS-free, Heavy overnight absorbency, Organic Cotton
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Pain Magnesium+ Spray with lavender and arnica. Absorbs quickly and leaves no residue.
Scarlet Period Underwear Laundry Bag | Lightweight mesh delicates washing bag
Scarlet Period Go With The Flow Kit | Bikini Brief, Boyshort, Magnesium+ Spray
Scarlet Period Boyshort – PFAS-free, Heavy overnight absorbency, Organic Cotton
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Boyshort – PFAS-free, Heavy overnight absorbency, Organic Cotton
Scarlet Period Bikini Brief - Available in Light & Moderate
Scarlet Period Pain Magnesium+ Spray with lavender and arnica. Absorbs quickly and leaves no residue.
Scarlet Period Underwear Laundry Bag | Lightweight mesh delicates washing bag

Go With The Flow Set

Flow handled. Morning to night.

$78.00 $84.00

Street to sofa, sorted. Bikini Briefs and Boyshorts for the range of your cycle, plus the Magnesium+ Spray for the evenings.

    Chemical-free (no PFAS!)
    Save $$ with Sets
    Organic Cotton Softness
    Comfortable Stretch Fit
Scarlet Period Bikini Brief (Size)
Scarlet Period Bikini Brief (Style)
Scarlet Period Boyshort (Size)

Feel good and stay comfortable all day with our top-selling mix of products - all made from sustainable, skin-friendly materials, all in one easy pack.

⭐ Bikini Briefs: Soft, organic cotton, PFAS-free, and comfy like your fave everyday undies.

⭐ Full-Coverage Boyshorts: Breathable, absorbent, and perfect for overnight protection.

⭐ Magnesium+ Spray: A fast-absorbing spritz with arnica and lavender to help relax your belly in seconds.

⭐ Laundry Bag: This handy wash-day essential keeps your period undies in top shape.

⭐ Period Undies: Rinse in cold water, machine wash cold with mild detergent, and line dry or tumble dry low. Do not bleach or use fabric softener.

⭐ Scarlet Laundry Bag: This mesh bag protects period undies, activewear, and delicates on laundry day.

⭐ Magnesium+ Spray: Spritz 3–6 times, massage in, and store below 30°C for soothing, skin-friendly relief.

✨ Period Undies: They are made from 95% organic cotton and have a PFAS-free, quick-dry gusset for breathable, leak-proof protection.

✨ Magnesium+ Spray: Vegan and cruelty-free, infused with skin-loving ingredients like arnica, chamomile, and magnesium to help relax.

✨ Fit Note: Our underwear runs on the slightly smaller side - if you're between sizes, size up.

✨ Teen-to-Adult Fit: Our sizing is unique. Please refer to both the numerical (e.g., 10, 12) and letter sizing (e.g., M, L) in our guide.

✨ Australian Sizing: We use AU sizes - international customers, check our Size Guide.

✨ Still Unsure? Contact us for advice. We love a chat!

Did you know that over 12 billion pads and 7 billion tampons end up in landfills yearly? By choosing Scarlet, you're supporting a more sustainable future where self-care and sustainability go hand in hand.

✨ GOTS Organic Cotton: Soft, breathable, and sustainably grown.

✨ PFAS-Free, No Harmful Chemicals: Because your body - and the Earth - deserve better.

✨ Recyclable Packaging: Minimal waste for a cleaner world.

Scarlet is proud to be a 1% for the Planet member, joining a global movement dedicated to environmental conservation.

Size Chart

Size chart for Go With The Flow Set
Scarlet Period Go With The Flow Kit | Bikini Brief, Boyshort, Magnesium+ Spray

Go With The Flow Set

$78.00 $84.00
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Care goes beyond undies

Your cycle isn’t one-size-fits-all - and neither is this kit.
The Flow Kit is packed with comfort, care, and a little extra self-love to help you through the ups and downs and heavy nights.

  • Bikini Brief for everyday wear
  • Boyshort heavy protection for overnight flow
  • Magnesium+ Spray to relax belly tension
  • Laundry Bag to keep undies safe on wash day
BUY NOW

Your Questions, Answered

Why is everyone obsessed with magnesium?! And it’s not even oil?

Because it’s bloody amazing! Magnesium plays a vital role in over 300 biochemical processes in the body. It impacts energy, muscle function, and stress management. It can help with improved sleep, muscle relaxation, and overall well-being. 

And you're right, Sherlock. Magnesium oil is called "oil" due to its slick texture, although you’re spot on, it's not a true oil in a chemical sense. It’s still packed with buckets of benefits, plus an ultra-nourishing sensation on the skin.

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.

Why add extra extracts to a magnesium spray?

Because we reckon our magnesium sprays can (and should!) do more for us. Our soothing blend of tangerine, chamomile, rosemary, and arnica is the perfect cocktail for deep relaxation and refreshment. The extracts we’ve used have been tested to potentially help reduce inflammation, relax muscles, and boost skin health. 

How do I wash them?

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!

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.

How do they work?

Scarlet Period Underwear is designed to fit like normal underwear and features multi-layered leak-proof technology that wicks away moisture, absorbs fluid, and contains it 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.

How do I pick the right size for me?

We get it, sizing for bottoms is anything but standardised. Which is why this size guide will help break it down for you. Make sure to check both our numeric and letter sizing so no confusion (ie. our large is a 12).

When in doubt, feedback tells us better to size up. Still confused? You can also email us for help at support@scarletperiod.com.
★★★★★

"Their mid-rise Period Bikini Brief is the perfect day-to-day option; available in nifty bundles to save some dough, too."

Harper’s Bazaar

★★★★★

"This is a great one. Spray it on your stomach. My sister has bad period pain and loves it."

You Beauty

★★★★★

"Comfy and casual... won’t make you feel like you’re wearing a giant nappy."

Body and Soul

Real advice for real cycle days