High-waisted period underwear
MATERIAL
MATERIAL
WASHING GUIDE
WASHING GUIDERinse - wash - wear - repeat
1. If you have wet your panties, rinse them in cold water until the water runs clear.
2. Protect your panties in a laundry bag and wash your panties with similar colors at 30-30 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 the whole our guide on how to take good care of your panties here.
HOW DO MENSTRUAL PANTS WORK?
HOW DO MENSTRUAL PANTS WORK?Flow period panties are sewn with a built-in pad, consisting of at least 3 technical layers, which draw fluid into the pad, absorb the fluid, and ensure that you do not bleed or drip through.
Absorbency corresponds approximately to:
Light flow: 2-5 mL
Moderate flow: 5-10 mL
Heavy flow: 10-15 mL
👉You can read much more about how absorbent panties work here.
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We deserve better
Why choose period underwear from Flow?
After two fertility treatments and two births, I no longer wanted to use menstrual products that had to go inside my body - I wanted to be able to bleed in peace.
That was the beginning of Flow - the first menstrual underwear on the Danish market.
Today, we make menstrual underwear with a focus on comfort, quality, and responsible production - created by people who themselves menstruate.
✔️ Soft, skin-friendly materials
✔️ Different absorption levels
✔️ Comfort like regular underwear
✔️ A more environmentally friendly alternative to disposable products
Our mission is to make menstruation more liberating, secure, and less cumbersome - without compromising on style or function.
Sincerely, Cathrine
What we are most proud of
5 great reasons why you'll love us
HEART ALWAYS FIRST
We are also here to create greater changes than just in your daily life.
Our founder changed Danish legislation in 2021 by having the age limit on frozen eggs removed.
In 2025, we created the Red Flag campaign, which secured the Danish women's national handball team the right to wear dark shorts during the World Cup. And we will continue.
SAFETY AND SECURITY IMMEDIATELY THEREAFTER
Despite the lack of legislation and safety requirements for menstrual products in the EU, we do not hesitate to take responsibility. We do not use PFAS, nanosilver – no magical "stay fresh" treatments of the absorbent layers. We third-party test our period underwear for chemicals and use innovation without compromising your safety to eliminate odours.
PREMIUM PRODUCTION
We produce in Portugal, Denmark, Lithuania, and Turkey – and always with the best materials such as organic cotton, organic merino wool, and ECONYL®.
Our partners are the best in their respective fields, and several of our factories are GOTS-certified, which sets requirements for employee welfare.
BY PEOPLE WHO MENSTRUATE, FOR PEOPLE WHO MENSTRUATE
We create products that we ourselves need – and test them thoroughly (so yes, they are tested with real menstrual blood). In addition, we have a test panel consisting of hardcore and dedicated members from our community who take the task seriously.
MORE THAN MENSTRUATION
We know it. It's about much more than menstruation. It's about a body in change – throughout the entire cycle, month after month.
That's why we're redefining what 'period products' are beyond a practical solution. The best-rated absorbent underwear, sure, but also care that supports you and your body throughout the entire cycle.
That's Flow Cycle Routine.
Need help?
Most asked questions about period underwear
It may depend on the materials your panties are made of.
Mesh is very stretchy and if you are between two sizes, we would suggest sizing down.
Lyocell and organic cotton are slightly firmer materials, and here we would suggest that you take your normal size.
It depends on the absorbency of the panties, which is indicated by drops. We have menstrual panties for both moderate and heavy bleeding.
If you are bleeding very heavily, you can use your panties together with a menstrual cup or disc.
We also have absorbent panties with low absorbency for everyday use.
👉If you need more absorption, you can choose menstrual panties instead.
A discreet fabric band is sewn into the bottom of the panties.
Regardless of the style, the pad consists of a minimum of 3 absorbent layers - a top layer that conducts the liquid down into the next layer, which is similar to a towel. At the bottom you will find a membrane that ensures that the liquid does not pass through the panty.
👉Read more in our guide to menstrual panties.
Rinse - wash - wear - repeat
1. If you have spotting in your panties, rinse them in cold water until the water runs clear.
2. Protect your panties in a laundry bag and wash your panties with similar colors at 30-30 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 the whole our guide on how to take good care of your panties here.
If you go all-in on absorbent panties and replace all panty liners and pads, you will need 10-12 pairs - depending on how easy you have access to a washing machine.
But if you only use absorbent panties for your period, we suggest 5-7 pairs.
The more panties, the easier everyday life.
That's why we also offer bundle discounts on multiple pairs.
"Leak" isn't really a word we find so delicious in the context of the body.
It sounds more like a leaking engine.
But you don't bleed directly through your panties. If they have reached their 'max' capacity, you bleed out to the sides.
You can believe it, they are!
The Danish Consumer Council Think has put a big focus on menstrual panties in 2022, and their experts also say good things about the method:
1) Rinse in cold water.
2) Wash at 40 degrees.
3) Air dry on a line.
👉 Read the whole our guide on how to take good care of your panties here.
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High-waisted period underwear – Our classic since 2021
The Period Flow Brief – High Rise is the period brief that started it all. Since 2021, it has been a favorite among thousands of women and has become a wardrobe staple for those who want comfort, security, and a timeless design throughout their period.
The high waist hugs the body softly and almost feels like a gentle hug around the stomach, while the characteristic mesh panels on the sides provide lightness, flexibility and good freedom of movement.
Understand our high-waisted menstrual panties:
- Period Flow Brief – High Rise (Flow 1) = the iconic classic with mesh, sporty look and the well-known Flow identity.
- Period Flow Brief - High Rise - Soft collection = the ultra-soft premium version in organic cotton with a focus on materials and extra comfort.
Comfort you'll want to wear all day
A good menstrual cup should be something you forget you're wearing.
That's why Period Flow Brief is designed with a soft elastic waistband that stays in place without tightening, chafing or rolling down. The signature curved seams at the front and back accentuate the body's natural curves, while the high waist provides a comfortable, enveloping fit.
The result is menstrual panties that feel as comfortable as your favorite underwear.
Discreet protection during menstruation
Behind the elegant design lies our discreet absorbent technology, which is integrated directly into the panty.
The absorbent panel helps protect during your period, so you can feel more confident throughout your workday, study, workout, or a quiet day at home. From the outside, Period Flow Brief looks like regular panties – only you know what they can do.
If you have very heavy periods, you can combine the panties with a menstrual cup or menstrual disc on the heaviest bleeding days.
Designed for movement
The flexible mesh panels on the sides make the Period Flow Brief light and comfortable to wear, while giving it a modern, feminine look.
The high waist and stable elastic ensure that the panties follow your movements - whether you're at work, exercising or relaxing at home.
That's why so many people choose Period Flow Brief – High Rise
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High-waisted menstrual panties
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Discreet absorbent technology
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Soft elastic with Flow logo
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Flexible mesh panels for added comfort
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High waist that stays put
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Flattering signature seams
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Looks and feels like regular underwear
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Produced in Portugal
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Free from PFAS and biocides
A classic in the Flow universe
Period Flow Brief – High Rise is designed to be worn over and over again. It's the model that many people start with – and return to.
A timeless design, thoughtful details and comfort that lasts throughout the entire cycle. In short: a classic made for everyday use.
Formerly known as Flow 1.
Frequently asked questions
Who is Period Flow Brief – High Rise suitable for?
This model is suitable for those who want menstrual panties with a high waist and a snug fit. Many choose it for the extra comfort around the stomach and the stable fit.
Does the high waist roll down?
No. The soft elastic at the waist is designed to stay comfortably in place without tightening or rolling.
How does the model differ from the Soft Collection?
The classic Period Flow Brief features the iconic mesh side panels and a sporty look. The Soft Collection is made from organic cotton and has a softer, more minimalist design.
Can I use it all day?
Yes. The panty is designed for all-day comfort and can be worn at work, school, during exercise or at home – depending on your bleeding and needs.
Can you tell that these are menstrual panties?
No. Period Flow Brief looks like regular high-waisted panties. The absorbent panel is discreetly integrated into the design.
How do I wash my menstrual panties?
Rinse the panties in cold water after use, wash them at the recommended temperature without fabric softener, and let them air dry to maintain their absorbency.
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