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Scarlet Back To Back set: rae wearable heat pad, two High-Waist Pocket Period Briefs, cleanser and mesh laundry bag
rae named Best in Class: Consumer Electronic Product of the Year 2025
Scarlet Period rae Heat Pad: Portable, USB-powered warmth for period pain.
Scarlet Period’s rae Heat Pad offers warmth for over 4 hours.
Scarlet Period Pocket Underwear keeps the rae heat device away from your skin to protect your skin for ongoing use, and it makes it move with you wherever your day takes you. 
Scarlet Period rae Heat Pad: 50°C heat, 3 soothing, comfy settings.
Scarlet Period Pocket Underwear includes a discreet pocket to hold rae.
Scarlet Back To Back set: rae wearable heat pad, two High-Waist Pocket Period Briefs, cleanser and mesh laundry bag
rae named Best in Class: Consumer Electronic Product of the Year 2025
Scarlet Period rae Heat Pad: Portable, USB-powered warmth for period pain.
Scarlet Period’s rae Heat Pad offers warmth for over 4 hours.
Scarlet Period Pocket Underwear keeps the rae heat device away from your skin to protect your skin for ongoing use, and it makes it move with you wherever your day takes you. 
Scarlet Period rae Heat Pad: 50°C heat, 3 soothing, comfy settings.
Scarlet Period Pocket Underwear includes a discreet pocket to hold rae.

Back To Back

Wash one, wear one, never short.

$175.00 $201.00

Two Pocket Undies, so one can be in the wash while the other is doing the work. rae sits in the pocket, and the cleanser and mesh bag handle the aftermath. Wash one, wear one, no maths at 6am.

    Good Design Award winner
    Good Design Award winner
    Two Briefs, wash one wear one
    Two Briefs, wash one wear one
    PFAS-free, lab tested
    PFAS-free, lab tested
    Free AU shipping $80+
    Free AU shipping $80+
High-Waist Pocket Period Brief (Size)
High-Waist Pocket Period Brief (Style)

The full setup, doubled where it counts.

✨ rae Wearable Heat Pad: Wireless and USB-C rechargeable, up to 50 degrees with three settings. Silent, splash-proof, about 270g.

✨ Period Pocket Undies x 2: The only undies with a built-in pocket sized for rae. Pick Light-Moderate or Moderate-Heavy. PFAS-free and independently lab tested.

✨ All-Over Daily Cleanser: pH-balanced and hydrating. TLC for your bits and beyond. 250ml.

✨ Mesh Laundry Bag: Keeps the elastic honest and your undies away from somebody else's zip.

✨ rae Wearable Heat Pad: Pick your setting, low (5+ hrs), medium (around 3 hrs) or high (around 2 hrs). Charges in around 90 minutes via USB-C. Wipe with a damp cloth, do not submerge. Not for use while sleeping.

✨ Period Pocket Undies: Rinse in cold water until clear, then machine wash cold with mild detergent. Avoid bleach and fabric softener. Line dry or tumble dry on low. Use the mesh bag.

✨ All-Over Daily Cleanser: External use only.

✨ rae Wearable Heat Pad: Food-grade hypoallergenic silicone, curved and winged, about 270g. IP54 splash-proof, certified RoHS and RCM.

✨ Period Pocket Undies: 95% organic cotton and 5% elastane, with multi-layered moisture-wicking. PFAS-free and independently lab tested.

✨ All-Over Daily Cleanser: pH-balanced and hydrating, made for sensitive skin.

✨ 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!

By choosing Scarlet, you're making a sustainable choice for your self-care routine and the planet. Our products are designed to reduce waste, promote reuse, and incorporate the cleanest ingredients and eco-friendly packaging.

✅ Reusable Options: From our underwear to our rae Heat Pad, we provide better sustainable, reusable period self-care options.

✅ Eco-Conscious Ingredients: We find the best ingredients/product components free from harmful chemicals.

✅ Recyclable Packaging: Designed to minimise waste.

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

Size Chart

Size chart for Back To Back
Scarlet Back To Back set: rae wearable heat pad, two High-Waist Pocket Period Briefs, cleanser and mesh laundry bag

Back To Back

$175.00 $201.00
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Scarlet Period rae Heat Pad: Wireless relief, soft silicone, smart period care.

Have you met rae - the heat pad that goes with your flow?

To be safe, let’s do some formal introductions…

rae is wireless and rechargeable, with a sleek, comfy design. Designed with three heat settings that go up to 50°C, it lasts up to 5 hours, and is wireless.

  • Curved for your comfort
  • Three heat settings, up to 50 degrees
  • Soft high-quality silicone
  • Wear with your Period Pocket Underwear
BUY NOW

Your Questions, Answered

Is Pocket Brief PFAS-free?

Yes, always. PFAS are the "forever chemicals" used to waterproof some fabrics, and most people wearing them have never heard the term. Pocket Brief is PFAS-free, independently lab tested.

Why does rae cost $129?

You're paying for premium build, not a gimmick: up to 50°C on high, 5+ hours on the low setting, USB-C rechargeable, and something built to last years instead of one disposable pack at a time. It's a one-off cost replacing an ongoing one.

When should I use rae?

As early as possible is best. Pop rae on at the first sign of your period or the first twinge of discomfort, rather than waiting until the cramps have properly set in. Heat works best as a head start, not a rescue mission.

How long does a wearable heat pad last on one charge?

Depends on the setting. Low: 5+ hours. Medium: about 3 hours. High: 2+ hours. Then it charges on USB-C, the same cable as most things in your bag.

How hot does rae get?

Up to 50°C on high. Three settings, so you choose. Most people start on low and stay there. It is warm and steady, not scalding, and that is deliberate.

Won’t rae just fall out of my pants?

Nope, because we’ve come up with a genius solution. Meet our Period Pocket Underwear: a customised version of our best-selling period underwear with a little pouch for the device, perfect for when you’re on the move.

Attached to your regular undies? No problem! Wear rae between your underwear and clothing. If using it directly on the skin, stick to a lower heat setting.
★★★★★

“Say goodbye to clunky hot water bottles and hello to rae, Scarlet’s game-changing, wearable, wireless heat device.”

- Sitchu

★★★★★

“rae gave the perfect amount of heat… Being able to change settings was a game changer because it felt safer and more comfortable.”

News

★★★★★

"A wearable, wireless heat device that’s far more practical than clutching a hot water bottle is pure genius."

Body & Soul

Real advice for real cycle days