High-Waist Seamless Leak-Proof Period Underwear
- In stock, ready to ship
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.
✨ 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
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Maximum Hold. Minimal Effort.
Holds up to 50ml — perfect for heavy flow, overnight wear or postpartum support (holds 8–10 tampons worth)
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4-layer leakproof tech + extra lining strips — targeted protection where it matters most
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Odour control built in — so you feel clean, confident, and dry all day
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High-waisted & sculpting — smooths, support, and holds you in all the right places
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No lines, no bulk — powerful protection without the padding
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Ultra-soft, breathable & moisture-wicking — serious absorbency that feels like second skin
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Moves with your body — for confidence that doesn’t quit
✨ Our most supportive style — made for movement, heavy flow and main character energy.
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.
“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.
