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Type : Fiora menstrual brief (high-waisted)
Fiora menstrual brief (high-waisted)
4.8
TRUSTPILOT
EXCELLENT
Choose your style
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Discover our one-piece swimsuits
Leak-proof and odour-free
Up to 12h of protection
Machine washable
30° without fabric softener
Reusable
For 5 to 7 years
Ultra-discreet protection
No bulky feel
Description
The Sybille period swimsuit lets you swim with total peace of mind during your period, with no tampon or cup. Its patented 4-layer technology absorbs the equivalent of 3 tampons while staying 100% invisible — indistinguishable from a regular swimsuit.
Designed with textile engineers and gynaecologists, tested in chlorinated pools and seawater.
Shipping & returns
Delivery: Ships within 5 to 7 business days to the US. Free shipping on orders over $60.
Returns: 30-day satisfied-or-refunded guarantee — even worn, even washed. If the size does not fit, free exchange. Contact us via the form on our website.
How to wash it?
- Rinse in cold water until the water runs clear
- Wash at 30°C in the machine or by hand with your usual detergent
- Dry in open air (4 to 6h)
No fabric softener, no tumble dryer, no bleach — to preserve the absorbent technology.
Benefits
- Ultra comfortable — nothing to insert, zero chafing
- Absorbs the equivalent of 3 tampons, up to 12h
- 100% invisible — no extra layer, no string
- Odour-free and antibacterial
- Resistant to chlorine, salt and UV
- Reusable for 5 years — 1,000+ tampons saved
Composition
Outer: 86% recycled nylon, 14% elastane — soft, chlorine-resistant, eco-friendly.
Built-in 4-layer technology:
- Fast-absorption layer — wicks moisture away from the skin
- Storage layer — microfibres that trap liquid
- Waterproof membrane — nothing gets out, nothing gets in
- Outer layer — UV50+ protection, chlorine/salt resistant
Durability
On average, a person uses 17,000 disposable products over their menstrual life — that much plastic waste ending up in the oceans.
A single Sybille swimsuit, used for 5 years, replaces around 1,000 tampons. Washable, reusable, no single-use plastic. It's good for you and for the planet.
What our founder is saying
Pourquoi nous choisir ? 🏆
2 Achetés = 1 Offert ! ⏳
Garantie 0 Fuites 🩸
Pour Ados et Adultes.
Loved by women across the US
Trustpilot · Rated Excellent on Trustpilot · 2,140 reviews
Total game changer
Wore these on vacation and felt completely secure the entire time. No leaks, no bulk, and you can't tell at all under my swimsuit.
Finally confident at the beach
I used to skip the pool on my period. Not anymore — these are absorbent, soft and super discreet.
Amazing quality
The material is so soft and holds up great after washing. Best period swimwear I've bought, hands down.
No more worries
Swam all day with zero leaks. They fit perfectly and feel just like a regular swimsuit bottom.
Love these so much!
Comfortable, flattering and you genuinely cannot see a thing. I feel so much more confident now.
Perfect fit
Stayed in place while swimming and at the beach. Dried fast and no bulky diaper feeling at all.
Bought them for my daughter
She loves them and finally feels comfortable swimming during her period. Highly recommend to every mom.
Wish I'd found these years ago
Lightweight, secure and totally invisible under my bikini. Already ordered another pair!
They're talking about period swimwear
InvisibleLeak-proofReusable
Why Sybille is a game-changer
Compare our 4-layer technology to conventional period products. Comfort, protection, sustainability — Sybille ticks every box.
COMPARE
Sybille
TAMPON
Invisible under your swimsuit
Nothing inserted into the body
Zero leaks guaranteed
12-hour continuous protection
Comfort (no damp feeling)
Suitable for teens
Reusable
Cost per use
$0.08
$0.25
Lifespan
5 years
single-use
What a Sybille swimsuit does best.
Developed with textile engineers and gynecologists: as thin as a classic swimsuit and with the best absorption on the market.
Find your perfect swimsuit
Which period swimsuit is right for you?
Answer 2 questions and discover the style that suits your body and your flow.
Question 1 / 2
What protection do you usually use on a typical period day?
Question 2 / 2
On your heaviest days, how often do you change your protection?
Your result
Swimming during your period.
Without mental arithmetic.
Without mental arithmetic.
- 12 PM water protection
- 3x buffer absorption
- 0 leak — 30-day warranty
- 4 years Research & Development
Trustpilot
Loved by women across the US
Real, verified experiences from our customers.
Excellent
TrustpilotBased on verified reviews
Summer Lookbook
Free to do everything, even when it's that time of the month
Our customers, captured in the moment. No stress, no compromise, just the joy of the water.
At the beach01
The sea, no calendar needed
The only thing on your mind is the water temperature. Not your period. Not a string. Not the time.
You go in when you want. You come out when you want. Without asking yourself a single question.
"I finally got to jump in the waves without overthinking everything."
— Julie 🇺🇸
At the pool02
A full day, without a second thought
You swim. You sunbathe. You have lunch. You dive back in. The absorbent lining holds for up to 12h in the water — three layers, waterproof membrane, zero feeling of dampness.
You put it on in the morning. You didn't think about it again.
On holiday03
This year, your period doesn't decide your plans
No more checking the period app before booking. No more crossing your fingers. No more plan B.
You go. That's it.
"This is literally what saved my last holiday."
— Isalu 🇺🇸
From age 1204
So she can live this summer like all her friends
You remember that feeling. Sitting on the towel while everyone else was swimming.
She won't have to remember it.
No tampon. Nothing to insert. Nothing to explain. Sizes from age 12 — made for her.
Everything you need to know before buying
Your questions, our answers
Product & Performance
Does it REALLY work in a swimming pool?
Yes. That's the fundamental difference from regular period underwear: the waterproof layer is designed to withstand prolonged immersion in chlorinated pools and sea water. Tested by our customers over full days with no leaks reported.
What flow level does it work for?
Perfect for moderate to heavy flow (equivalent to 2–3 tampons). For a very heavy flow, our honest recommendation: combine with a cup or change between swims.
Is it really invisible under the swimsuit?
Yes, completely. The 4-layer technology is as thin as a regular swimsuit. No creases, no visible thickness, even under a fitted light-coloured swimsuit.
What is the swimsuit made of?
Bottoms are made of 86% recycled Nylon and 14% Elastane — soft, chlorine-resistant and eco-friendly. Tops are 82% Polyamide and 18% Elastane for optimal support. The intimate lining features our patented Sybille® 4-layer technology.
What's the difference from regular period underwear?
Regular period underwear absorbs but isn't designed for immersion. Our swimsuits have a specific waterproof membrane that prevents water from getting in and flow from getting out — even in chlorinated pools or the sea.
Chlorinated pool AND sea water — does it work in both?
Yes, both. The technology has been tested in chlorinated and sea water. Chlorine doesn't affect the waterproof membrane or absorption capacity. Neither does salt.
Does it protect against UV rays?
Yes. The outer layer provides UV 50+ protection, shielding skin from harmful rays even when wet.
Care & Durability
How do I care for my swimsuit?
Rinse in cold water straight after use, then machine wash at 30°C with your usual detergent. No fabric softener, no tumble dryer. Air dry — that's it.
How long does it take to dry?
Air-dried, around 4–6 hours depending on the heat. If you're going on holiday, pack two — while one dries, you wear the other.
Does absorption decrease with washing?
No, as long as you follow the care instructions (30°C, no fabric softener, no tumble dryer).
How long does a Sybille swimsuit last?
With proper care, expect 2–5 years depending on frequency of use.
Can I use Marseille soap or vinegar?
Marseille soap is perfect for hand rinsing. Diluted white vinegar can be used occasionally to neutralise residual odours. Avoid bleach and chemical stain removers.
Use
How long can I wear it?
Up to 12 hours depending on flow. You can swim, sunbathe, have lunch, swim again — a full day at the beach or pool without needing to change.
Is there an odour after swimming?
No. The intimate layer has antibacterial treatment to prevent any odour from developing.
From what age can it be worn?
From the very first period. It's often the ideal solution for teenagers: nothing to insert, no stress about leaking during swimming. Sizes from XS (ages 10–14).
Can I wear it as a normal swimsuit outside my period?
Absolutely. It's a real swimsuit first and foremost — stylish, comfortable, thin.
Can I combine it with a cup or tampon?
Yes, and we actually recommend it for heavy flow. The swimsuit acts as a safety net: if the cup overflows or the tampon saturates, the swimsuit takes over.
Can I do water sports in it?
Swimming, aqua aerobics, paddleboarding, snorkelling — no problem. The swimsuit is designed to move with you.
What about light bladder leaks?
The absorbent technology also works for light bladder leaks. Many post-partum or perimenopausal customers use it at the pool for exactly this reason.
Orders & Customer Service
How do I choose my size?
Our swimsuits run slightly small — go one size up from your usual size. A detailed size guide is available on each product page.
Is it really worth the price?
$29.90. Over 5 years, that's about 3¢ per use — versus 25¢ for a disposable tampon. Beyond the savings, it's 1,000+ disposables avoided.
What are the delivery times?
Delivery in 5–7 business days to the contiguous US. Free shipping on orders over $50. You'll receive a tracking number by email as soon as it ships.
What if it doesn't fit or leaks?
30 days to test it. Wrong size: free exchange. Product doesn't deliver: full refund, even worn, even washed. Zero risk to try.
Is payment secure?
Yes, 100%. We use Shopify Payments' secure payment platform (SSL encryption). Credit card, Apple Pay or Shop Pay.
Can I give a Sybille swimsuit as a gift?
Of course. The exchange is free within 30 days if the recipient needs to swap sizes.
