Mid-Waist Seamless Period Underwear
- Ultra-thin, stays dry and invisible under any outfit.
- Leakproof protection for 10+ hours.
- Buttery-soft fabric that feels like your favourite underwear.
💋 SIREN Periodwear Sizing Guide
Measure Your Waist
Where: Wrap the tape around the narrowest part of your waist — above your belly button and below your ribs.
Tip: Keep it snug but comfortable; you should be able to breathe easily.
Measure Your Hips
Where: Stand with your feet together and measure around the fullest part of your hips and buttocks (usually 7–9 inches below your waist).
Tip: Make sure the tape is level all the way around for an accurate measurement.
Consider Stretch & Fit
✔ SIREN’s fabrics are sculpting and high-stretch for a flattering fit.
✔ For our Super Absorbency and Lace Brief, size up if you’re between sizes (these styles have less stretch due to their absorbent layers).
✔ For our Seamless cheeky styles, choose your regular size or size down for a firmer feel.
💌 Need a Hand?
Not sure which size to choose?
Message us and our team will help you find your perfect fit so you can feel confident, comfortable and completely covered.
Our most secure style designed to handle your heaviest days with zero stress and zero bulk.
Why you'll love it:
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Up to 10 tampons worth of absorbency
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Stays dry - moisture-wicking & fast-absorbing top layer
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Odour-control - stay fresh all day
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Sculpting fit - smooths & supports
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Seamless finish - no lines, no padding feel
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Ultra-soft & breathable - comfort that moves with you
Best for:
Heavy flow days • Overnight • Postpartum • High-movement days
Do SIREN Periodwear replace pads and tampons?
Yes SIREN is designed to completely replace pads and tampons. Our built-in absorbent technology locks in leaks and keeps you dry, so you can wear them on their own with total confidence, no extra products needed.
How long can I wear SIREN?
SIREN provides up to 10+ hours of leakproof protection, depending on your flow. Our multi-layer technology keeps you feeling dry, fresh and confident day or night.
How does SIREN Periodwear work?
SIREN features a 4-layer absorbent system that:
- Wicks moisture away from your skin
- Locks in leaks and odour
- Keeps you dry and comfortable
Our ultra-thin leakproof lining is built into the gusset, giving you protection exactly where you need it without bulk.
What is your return policy?
We offer a 60-Day Money Back Guarantee so you can try SIREN risk-free.
- If you’ve tried your SIREN and it’s not right for you, contact us within 60 days for a refund
- You may keep the item you’ve worn
- If your order included multiple items, any unworn items must be returned to receive a full refund
- For change-of-mind or size exchanges, items must be unworn, and return shipping is the customer’s responsibility
Simply email admin@sirenperiodwear.com with your order number and our team will assist you.
Are SIREN fabrics safe and high quality?
Yes SIREN is crafted using certified, high quality materials that are safe for your body and designed to last.
✔ OEKO-TEX® certified fabrics – free from harmful substances
✔ FDA-approved textiles – safe for skin contact
✔ GRS-compliant sourcing – supporting responsible manufacturing
How do I wash my SIRENs?
With the right care, your SIRENs are designed to last you years while maintaining their performance.
After use:
- Rinse in cold water
- Machine wash on a gentle cold cycle
- Do not use bleach or fabric softener
- Air dry flat (no tumble drying)
Where do you ship?
We currently ship Australia-wide 🇦🇺
✔ Free standard shipping on orders over $100
