Name: Seamless Cheeky Leak-Proof Period Underwear
Brand: SIREN
Price: 49.99 AUD
Availability: InStock

Seamless Cheeky Leak-Proof Period Underwear

$49.99

Shipping calculated at checkout.

Size

Low stock - 3 items left
Backordered, shipping soon

Size chart

SIREN Periodwear Sizing Guide

To ensure the perfect fit for comfort, sculpting, and leakproof protection, it's important to measure correctly. Here’s how you can get your accurate underwear size before purchasing SIREN Periodwear:

1️⃣ Measure Your Waist

🖤 Where to measure: Wrap the measuring tape around the narrowest part of your waist (above your belly button but below your ribs).
📏 Tip: Keep the tape snug but not too tight—you should be able to breathe comfortably

2️⃣ Measure Your Hips

🖤 Where to measure: Stand with feet together and measure around the widest part of your hips and buttocks (this is usually about 7–9 inches below your waist).
📏 Tip: Ensure the tape is level all the way around for the most accurate measurement.

Consider Stretch & Fit

✔ SIREN’s underwear is sculpting, seamless and made with high-stretch fabric.

Need Help?

Not sure which size to get? Message us! Our team is happy to help you find the perfect fit so you can feel confident, comfortable, and protected.

Quantity

✨ How It Works
Add any combination of styles & sizes — no restrictions.

Your bundle discount will automatically apply at checkout — no code needed.

Because one pair isn’t enough and your period deserves options.

3+ → 10% Off + Free Shipping + Free Wash Bag
4+ → 15% Off + Free Shipping + Free Wash Bag
5+ → 20% Off + Free Express Shipping + Free Wash Bag
7 → 30% Off + Free Express Shipping + Free Wash Bag

A SIREN Favourite
Holds up to 30ml of liquid — ideal for moderate flow days (5–6 tampons worth)
Invisible under everything — sleek, sculpting & second-skin soft
4-layer leakproof tech — designed for 10+ hours of reliable protection
Odour control built in — for that all-day fresh feeling
No bulk, no bunching — just smooth, seamless confidence
Breathable + moisture-wicking — made to move with you
The ultimate multitasker — perfect for daily wear, workouts or mid-flow days

✨ A SIREN staple — designed for comfort, built for confidence.

What makes SIREN different from other period underwear brands?

SIREN is more than just periodwear it’s luxury, function and confidence combined. Our seamless, sculpting designs feel like your favourite lingerie while delivering 10+ hours of leakproof protection. No bulk. No compromise. Just periodwear redefined.

How does SIREN periodwear work?

SIREN’s advanced 4-layer absorbent technology locks in moisture, wicks away sweat, and prevents leaks so you feel dry, fresh, and secure all day. Our leak-proof lining strips provide extra protection exactly where you need it, without sacrificing comfort or style

How long can I wear SIREN period underwear?

Our periodwear provides up to 10+ hours of leakproof protection, depending on your flow.

What absorbency levels do you offer?

Light Flow (20ml) → Equivalent to 4 regular tampons
Medium Flow (30ml) → Equivalent to 6 tampons
Heavy Flow (50ml) → Equivalent to 10 tampons

Is SIREN periodwear sustainably made?

Yes - SIREN is committed to sustainability and ethical production. Our periodwear is crafted in facilities that adhere to the highest international standards for safety, sustainability, and fair labor practices.

✔ OEKO-TEX® Certified Fabrics – Made with materials that are tested and certified to be free from harmful substances, ensuring safety for intimate wear.
✔ FDA Approved Materials – Our components meet global safety standards for medical-grade textiles and skin contact.
✔ Global Recycle Standard (GRS) Compliance – Supporting responsible sourcing and environmental sustainability

Where do you ship?

We ship Australia-wide with FREE shipping on orders over $100 and FREE express shipping on orders over $199.

What’s your return policy?

💡 60-Day Money-Back Guarantee
We believe in our products so much that if you’re not completely in love with your SIREN periodwear, we’ll make it right—just email us at admin@sirenperiodwear.com.

4 interest-free payments with Afterpay

★ ★ ★ ★ ★

“I was not expecting to love these this much. I originally only bought 1 pair to try and immediately came back and purchased another 4. The fit is super comfy and I love that they don’t look like period undies 😂 I also pushed them to the limits on my heaviest day and got 12 hours wear out of them, zero leaks! Love love love!”

– Amara S.

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HOW IT WORKS

LUXE TOUCH LAYER
The top layer is soft, breathable, and ultra-gentle on your skin. It wicks away moisture instantly keeping you feeling fresh, dry and comfortable.

SMART ABSORBENT CORE
This is where the magic happens. Our advanced absorbent layer quickly pulls in liquid and locks it away. No bulk, no sogginess.

INVISIBLE SHIELD LAYER
A lightweight, leak-locking layer sits right where you need it most. It moves with your body and keeps everything contained

BREATHABLE PROTECTIVE LAYER
The final layer keeps it all in. It’s designed to repel leaks and let your skin breathe

LEAK-PROOF LINING STRIPS
Strategically placed reinforcements along the gusset add extra protection in high-flow zones, giving you full coverage and peace of mind (even on your heaviest day).

Luxe Fabrics. Seductive Details. Unstoppable Confidence.

SIREN isn’t just about protection it’s about power. From seamless, second-skin silhouettes to delicate lace trims, every piece is designed to make you feel as incredible as you look. Because your cycle deserves nothing less.

Sustainable. Empowering. Game Changing.

Ditch disposables and upgrade to confidence that lasts. SIREN is a luxe, eco-conscious investment better for the planet, better for your body, and designed to keep up with you, every single day.

Flawless under any fit. effortless for every moment

From bodycon nights to lazy Sundays, SIREN moves with you. Our sleek, seamless designs disappear under any outfit so you can feel sexy, secure, and completely unstoppable, no matter the occasion.

These definitely do look like period undies, I love them

So comfy!!

Love this, seamless, every day vibe! A staple in any girls wardrobe.

Zero bulk like how!? I wore them all day at work and they held up perfectly. The only thing is they take a bit longer to air dry after washing compared to my other pairs. Still love them though!

Love the material and love how they look. They’re sleek and really do disappear under clothes. I just found that I could've sized down a bit because of the stretch of the material.

Feels like I'm wearing nothing in the best way

Honestly didn’t think I’d be obsessed with a pair of period underwear, but here we are. The seamless fit is perfection under my gym leggings and it holds up perfectly on my medium days

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Seamless Cheeky Leak-Proof Period Underwear