Menstrual bikini - Ragnhild brief
Why you'll love this style
Why you'll love this style
WHO IS IT NAMED AFTER?
WHO IS IT NAMED AFTER?
MATERIAL
MATERIAL
WASHING GUIDE
WASHING GUIDE
HOW DOES IT WORK?
HOW DOES IT WORK?Menstrual swimwear, like Flow menstrual panties, is sewn with a built-in pad, consisting of a minimum of 3 technical layers that direct fluid into the pad, absorb the fluid and ensure that you do not bleed or leak through.
👉 You can read much more about how menstrual swimwear works in the guide here.
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Flow's founder
Relaunch of Period Swimwear 2026
"Period swimwear is back! We've spent two years perfecting the fit and materials (we've chosen the best Italian fabrics).
Last summer, I tested the function and fit. I'm not usually a water baby, but of course, the samples I had in my suitcase had to pass their big test.
They passed with flying colours. I felt safe, comfortable - and chic. I'm incredibly excited to see you in the swimwear on the beach, by the pool, in gardens".
- Cathrine
Want to know more about our menstrual swimwear?
Frequently asked questions
Please wear your regular size in your swimwear.
If you are between two sizes, we would suggest the smaller one, as the fabric can stretch when wet.
The absorbency of menstrual swimwear is light to moderate.
If you are bleeding heavily, we suggest that you combine it with a cup or a disk.
Our swimwear is designed with a built-in, absorbent layer that captures and encapsulates menstrual blood. This layer is combined with a waterproof yet breathable membrane that prevents you from bleeding through while swimming or sunbathing.
The textiles are light and quick-drying, ensuring that you can move freely and feel dry shortly after being in the water.
1. If you have bled in your menstrual swimwear, rinse them in cold water until it runs clear.
2. Protect your swimwear in a laundry bag and wash your panties with similar colors at 30-40 degrees.
Tip: You can wash with our Allergy Certified special detergent Bloody Clean .
3. Dry them inside out on a clothesline - and you're good to go again.
👉 Read our full guide on how to take good care of your swimwear here.
period bikini - Ragnhild bikini bottom
Ragnhild bikini briefs are an elegant period bikini with a simple, timeless design. It is created for those who want a classic bikini bottom with discreet protection during menstruation - without compromising on comfort or style.
The minimalist design hides the most important thing: a sewn-in absorbent panel with three functional layers that protects against light to moderate bleeding. From the outside, the Ragnhild bikini bottom looks and feels like a regular bikini.
How does the Ragnhild menstrual bikini work?
Ragnhild bikini briefs are designed with a discreet absorbent gusset, which is integrated directly into the bikini briefs. The three functional layers help protect during menstruation, while the bikini retains its elegant look and light feel.
The snug fit provides extra security when bathing, swimming or relaxing by the pool.
At stronger period Ragnhild Bottom can be combined with a menstrual cup or menstrual disc for extra protection.
Designed for your entire cycle
One period bikini is not just for the days when you have period.
Ragnhild bikini bottoms can be worn all month long and work just like a regular bikini, making them an ideal choice for beach trips, vacations, wellness and swimming – no matter where you are in your cycle.
Italian quality with a focus on comfort
Ragnhild bikini bottoms are made from an exclusive Italian swimwear fabric with 4-way stretch, which provides a soft and flexible fit. The material follows the body's movements, dries quickly and holds its shape, so the bikini feels comfortable both in and out of the water.
The classic design makes it easy to combine with our bikini tops, so you can create a bikini set that suits your personal style.
That's why many choose Ragnhild bikini bottoms
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period bikini with discreet three-layer absorbent technology
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Protects against light to moderate period
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Can be used throughout the cycle – even without period
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Classic and timeless design
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Looks and feels like a regular bikini
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Quick-drying Italian fabric with 4-way stretch
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Comfortable fit with good freedom of movement
Match with the rest of our period swimwear
Ragnhild bikini bottom is part of Flow's collection of period swimwear and can be matched with the Ragnhild Bikini Top or combined with the other bikini tops in the collection.
The entire series is developed with a focus on comfort, function and timeless design, so you can bathe, swim and enjoy the summer with greater freedom – even during your period.
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