


Menstrual bikini - Ragnhild brief
Loved by +25,000 women
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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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 briefs
Ragnhild bikini briefs are an elegant period bikini with a simple, timeless design. It was created for you who want a classic bikini brief with discreet protection during menstruation - without compromising on either comfort or style.
The minimalist design hides the most important thing: a sewn-in absorbent panel with three functional, absorbent layers that protects against light to moderate bleeding. From the outside, Ragnhild bikini briefs look and feel like a regular bikini - just with extra coverage.
How does the menstrual bikini Ragnhild work?
Ragnhild bikini briefs have been developed with a discreet absorbent wedge, which is integrated directly into the bikini briefs. The three functional layers help protect during menstruation, while the bikini maintains its elegant look and light feel.
The tight fit provides extra security when you bathe, swim or relax by the pool.
In case of heavy bleeding, 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 briefs can be used throughout the month and work exactly like a normal bikini, just with light absorption. Therefore, it is an obvious choice for beach trips, holidays, wellness and swimming – regardless of where you are in your cycle.
Italian quality with focus on comfort
Ragnhild bikini briefs 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 keeps its shape, so the bikini provides maximum comfort 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 briefs
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period bikini with discreet absorbent technology in three layers
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Protects wood light to moderate period
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Can be used throughout the cycle - also 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 ours period swimwear
Ragnhild bikini briefs are 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 has been 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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