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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 rae Heat Pad: 50°C heat, 3 soothing, comfy settings.

Scarlet Period Pocket Underwear includes a discreet pocket to hold rae.

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.

rae named Best in Class: Consumer Electronic Product of the Year 2025

Power Pair

Q: What does the absorbency level mean?

Super Light: Holds up to 1 teaspoon, equal to less than one regular tampon. Think of it as a new-age panty liner, great for spotting, light leaks and discharge. Try: Invisible ThongLight: Holds up to 3 teaspoons, equal to 2 regular tampons or one pad. For light days, drips and discharge. Try: G-String or Bikini Brief in Light-ModerateModerate: Holds up to 5 teaspoons, equal to 3 regular tampons or 2 pads. For moderate days, or as extra defence on heavy days with our Period Cup. Try: High-Waist Brief or Bikini Brief in Moderate-HeavyHeavy: Holds up to 7 teaspoons, equal to 4 regular tampons or 3 pads. Our heavy hitters are great worn on their own, day or night. Try: Boyshort or Period Cup

Heat plus hold. Out all day.

$140.00 ~~$153.00~~

The setup that started it all. rae, plus the Pocket Undies built to hold it. Heat that stays where you put it, no hand on your stomach required.

Good Design Award winner

The undies built to hold rae

12-month warranty

Free AU shipping $80+

Scarlet Period High-Waisted Pocket Brief (Size)

6 (XS) 8 (S) 10 (M) 12 (L) 14 (XL) 16 (XXL) 18 (XXXL)

Scarlet Period High-Waisted Pocket Brief (Style)

Light-Moderate Moderate-Heavy

Why You'll Love it

Say hello to your new period power duo: cosy, discreet relief with the rae Heat Pad + Period Pocket Undies, wherever your day takes you.

✨rae Heat Pad: Soothing heat for ultimate period self-care and comfort. USB-rechargeable, ultra-slim, and heats up fast with 3 settings.

✨ Period Pocket Undies: Available in Light–Moderate or Moderate–Heavy, and are made from breathable, organic cotton.

Easy Care, Zero Fuss

✨ rae Heat Pad: Select your heat setting: low (5+ hrs), medium (3 hrs), or high (2+ hrs). Best used with Period Pocket Undies or over underwear. For direct skin use, stick to lower settings and short intervals.

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

Materials & Composition

✨ rae Heat Pad: Made from super-soft, scent-free silicone with three customizable heat settings.

✨ Period Pocket Undies: Soft organic cotton (PFAS-free) with fast-absorbing 4-layer technology for dryness.

Size & Fit

✨ 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!

Planet-Friendly Practices

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.

Power Pair

$140.00 ~~$153.00~~

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 totally 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

Umm, what is rae?

rae is a wireless, wearable heat pad designed for period and pelvic comfort on the go. No cords, no microwaving, and no stick-on patches. Just rechargeable heat that fits discreetly under your clothes.

How hot does rae get?

It has a built-in thermometer, so it maintains the heat level depending on the heat setting you are using (up to 50 degrees). We suggest always starting on a low setting until you get used to it and find the right heat for you.

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.

Can I use rae without the undies?

rae is designed to get hot, so we do recommend using rae with them or otherwise over your undies. If using directly on the skin, start at the lowest setting and monitor your comfort.

Can I use the undies without rae?

We’re not here for rules, so you do you boo! They do have additional fabric for the pocket at the front so if not using with rae, you might prefer our Bikini Brief or High-Waisted Brief.

What does the absorbency level mean?

Super Light: Holds up to 1 teaspoon, equal to less than one regular tampon. Think of it as a new-age panty liner, great for spotting, light leaks and discharge. Try: Invisible Thong

Light: Holds up to 3 teaspoons, equal to 2 regular tampons or one pad. For light days, drips and discharge. Try: G-String or Bikini Brief in Light-Moderate

Moderate: Holds up to 5 teaspoons, equal to 3 regular tampons or 2 pads. For moderate days, or as extra defence on heavy days with our Period Cup. Try: High-Waist Brief or Bikini Brief in Moderate-Heavy

Heavy: Holds up to 7 teaspoons, equal to 4 regular tampons or 3 pads. Our heavy hitters are great worn on their own, day or night. Try: Boyshort or Period Cup

★★★★★

“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

★★★★★

“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