Introduction
Your period isn’t a PR crisis. It’s biology begging for better tools. Scarlet is the Australian, independently owned femtech turning cycles into self-care, award-winning heat tech, leak-proof underwear and swim, a medical-grade cup, and magnesium-rich body care. This is self-care with a degree in design.
Video
Video Credit
Video courtesy of Scarlet Period Care featuring model and content creator Natascha on set in Byron Bay. Natascha takes Scarlet’s Period Swim Bikini Brief and Swim Short for a spin, proving leak-proof can still look luxe. Designed for light to moderate flow, both pieces move with you; sustainable, PFAS-free, and made for real bodies.
Location
Business Return Address: 7 Warehouse Circuit, Yatala, QLD 4207, Australia
Company HQ: Based in Byron Bay, NSW
Website: scarletperiod.com
The BioHax Take
Think Dyson-level design meets real-world flow. Scarlet builds purpose-made kit that’s kinder on bodies and landfills. Everything is independently lab-tested, PFAS-free, and wrapped in recyclable packaging. Founder Jo took a brutal run-in with stage-4 endometriosis (losing her uterus, tubes, and parts of kidney/bowel), and turned it into a blueprint for smarter, gentler period care. That conviction shows up in the details.
Rae Wireless Heat Pack
Finally, longer-lasting period heat without cords or crinkly patches. rae is a USB-rechargeable, slim, wearable device that heats up to 50°C, runs 5+ hours, and tucks discreetly under clothes (or slides into Scarlet’s Period Pocket Undies). Hypoallergenic, soft, splash-resistant, food-grade silicone with three heat settings and flexible wings; stores in its own case.
Awards: 2025 Good Design Awards – Gold + Best in Class (Consumer Electronic Product).
Planet angle: replaces single-use heat patches; durable build, recyclable packaging, PFAS-free / no nasties.
Photo Credit: Scarlet’s signature heat technology meets leak-proof comfort. Featuring the rae wireless heat pad and PFAS-free period underwear, this range blends body science with everyday ease, made to move, rest, and recover naturally.
Reusable Period Cup
Eight hours, zero strings. Medical-grade silicone, soft-flex fit, leak-proof protection for active days. Washable and long-lasting... save up to $1,080 over five years versus disposables.
Period Underwear
Leak-proof tech that actually replaces pads. All undies are PFAS-free, chemical-treatment-free, and made from 95% GOTS-certified organic cotton + 5% spandex with a quick-dry polyester/PUL gusset.
Boyshort (heavy) — the overnight MVP
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Absorbency: up to 7 tsp (≈ 4 tampons or 3 pads)
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Coverage: higher rise at the back; secure sleep companion
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Fabric feel: soft, breathable organic cotton; zero bulk
Photo Credit: Image courtesy of Scarlet Period Care, Australia. Scarlet’s Period Boyshort offers overnight-level protection with breathable organic cotton comfort. Designed for heavy flow and deeper sleep, it’s leak-proof, PFAS-free, and made to move with you.
Bikini Brief (light & moderate)
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Absorbencies: Light 3 tsp / Moderate 5 tsp
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Looks like regular undies, acts like a bodyguard
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Organic cotton comfort, quick-dry gusset, PFAS-free
How it works (both styles): 4 layers, moisture-wicking top, high-absorbency core, leakproof barrier, breathable outer. Holds more than a pad and lasts years, not hours.
Easy care, zero fuss (both styles):
Rinse cold until clear → machine wash cold with mild detergent (no bleach/softener) → line dry or tumble low. Pro tip: wash before first wear to “activate” absorbency. Use Scarlet’s laundry bag between washes.
Size & Fit:
Runs slightly small if between sizes, size up. AU sizing with numeric + letter guide; teen-to-adult fit. Need help? Support team answers sizing questions.
Absorbency Map:
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Super Light: 1 tsp (spotting / liner replacement)
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Light: 3 tsp (2 regular tampons / 1 pad)
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Moderate: 5 tsp (3 regular tampons / 2 pads)
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Heavy: 7 tsp (4 regular tampons / 3 pads)
Money Math: switching to Scarlet underwear can save up to $1,080 over five years.
30-day risk-free trial: one pair for first-time shoppers, swap/refund if it’s not love.
Photo Credit: Image courtesy of Scarlet Period Care, Australia. Scarlet’s Period Bikini Brief blends everyday comfort with leak-proof protection. Made from soft organic cotton and free from PFAS, it looks and feels like your favourite underwear, only smarter.
BioHax Tried & Tested
When Scarlet first landed at BioHax HQ, the team didn’t just nod politely and file it under “period stuff.” They sent samples our way, and Cassandra Murphy, our Partnerships Manager, took the mission personally.
She lined them up against her usual rotation, yes, including the heavy hitters like Modibodi and Love Luna, and wore them through real life: long commutes, late nights, and that familiar 3 a.m. roll over.
Her first impressions were instant: “Quality felt better than other brands, softer, thinner but still safer.” After years of cycling through every label on the shelf, that comment meant something. The Boyshort’s higher rise scored serious points for overnight peace of mind, no awkward tugging, no 3 a.m. panic checks, just a quiet confidence that you’re covered.
She ran them through the usual BioHax gauntlet: desk days, workouts, and the laundry test (twice). No sagging, no stiff seams, and no weird wear after washing. The gusset dried fast and stayed breathable, earning bonus points on Sydney’s humid nights.
When it came to the Bikini Brief, Cassandra was just as forensic: “I liked the thick band on the bikini ones, but the boyshorts make you feel secure enough to sneeze.” The bikini’s fit, she added, felt more suited to light to moderate days or travel, less bulk, still confidence.
They passed every test: comfort, absorbency, design, and confidence. And because Scarlet sent them through to us directly, we can confirm they weren’t just tested, they were tried, compared, and completely BioHax approved.
Period Swimwear
High-waist swim short (light = 1 tampon): recycled, quick-dry fabric, leak-proof layer, stay-put fit. Pool days are back on the calendar.
Bath & Body
Cycle care beyond the drawer:
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Magnesium+ Spray: fast-absorbing with lavender + arnica to calm cramps and tension.
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Soothing Suds Bubble Bath: grown-up bubbles; magnesium-spiked to soothe muscles; allergen-aware.
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Daily Cleanser (scented + unscented): pH-balanced, hemp extract, calendula, jojoba oil, gentle enough for body and bits.
Who It’s For
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People who want sustainable, PFAS-free period care
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Heavy-night sleepers, gym-goers, beach-people, commuters
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Teens through perimenopause wanting leak insurance
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Anyone done with single-use pads, patches, and the guilt
Key Materials
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GOTS organic cotton (95%) + spandex (5%) for stretch
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Polyester/PUL quick-dry leak-proof gusset
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Food-grade / medical-grade silicone (rae + cup)
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Recycled swim fabrics
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PFAS-free, toxin-free, independently lab tested
Sustainability Snapshot
Periods create waste; Scarlet doesn’t. Reusables that displace an estimated 12B pads and 7B tampons a year. Recyclable packaging, eco-conscious manufacturing, built-to-last design, and 1% for the Planet membership.
The Founders
Jo built Scarlet after surviving stage-4 endometriosis. The brief was simple: make period self-care better, hotter heat, cleaner fabrics, honest education. The result: rae, crowned Best in Class by Good Design Australia, and a full range that treats periods like something worth designing for.
Know Yourself
Scarlet treats cycle literacy as self-care. Periods, hormones, sex, women’s health—table talk. Transparent education sits beside the products so you can be clued-up and in control.
Frequently Asked Questions
Are Scarlet products PFAS-free and lab tested?
Yes. Underwear, swimwear, and devices are independently lab tested, PFAS-free, and free of harsh chemicals.
How much do the undies hold?
From 1 tsp (super light) to 7 tsp (heavy), 1–4 tampons depending on style.
Do I need pads or tampons as backup?
No. Wear Scarlet solo, or pair with a cup on very heavy days if you prefer.
Can I swim in the underwear?
Use Scarlet period swimwear, it’s built for water with recycled quick-dry fabric and leak-proof lining.
How do I wash them?
Rinse cold until clear → machine wash cold, mild detergent → line dry or tumble low. No bleach or softeners.
Do they run small?
Slightly. If between sizes, size up. AU numeric + letter sizing; teen-to-adult fit.
What’s the care routine for rae?
Wipe clean, air dry. Charge via USB. Use low/med/high heat; if on bare skin, stick to lower settings.
How long does rae last per charge?
Up to 5+ hours on low, ~3 hours on medium, 2+ hours on high.
How much could I save switching to Scarlet?
Up to $1,080 over five years versus disposables.
Where is Scarlet from?
Australian-owned and independently run, partnering with trusted, ethical manufacturers; products are designed in Australia.
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Article originally published: 25 October 2025, by Editor
