

Low-rise period brief
Loved by +25,000 women
Rinse - wash - wear - repeat
1. If you've bled in your period underwear, rinse them in cold water until it runs clear.
2. Protect your period underwear in a laundry bag and wash them with similar colors at 30-30 degrees Celsius.
Tip: You can benefit from washing 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 period underwear here.
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 leak through.
Absorption is approximately equivalent 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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"De bedste trusser på markedet!"

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 went inside my body – I wanted to be able to bleed in peace.
That was the beginning of Flow – the first period panties on the Danish market.
Today, we make period panties with a focus on comfort, quality, and responsible production – created by people who menstruate themselves.
✔️ Soft, skin-friendly materials
✔️ Different absorbency levels
✔️ Comfort like regular underwear
✔️ A more environmentally friendly alternative to disposable products
Our mission is to make menstruation more free, secure, and less bothersome – without compromising on style or function.
Best regards, Cathrine
What we are most proud of
5 great reasons why you'll love us
THE HEART ALWAYS FIRST
We are also here to create bigger changes than just in your daily life.
Our founder changed Danish legislation in 2021 by removing the age limit on frozen eggs.
In 2025, we created the Red Flag campaign, which ensured the Danish women's national handball team the right to wear dark shorts during the World Cup. And we will continue.
PEACE OF MIND AND SAFETY IMMEDIATELY AFTER
Despite a lack of legislation and safety requirements for menstrual products in the EU, we do not shy away from our responsibility. We do not use PFAS, nano-silver – no magical "stay fresh" treatments of the absorbent layers. We third-party test our panties for chemicals and use innovation without compromising your safety to address odour issues.
PREMIUM PRODUCTION
We produce in Portugal, Denmark, Lithuania, and Turkey – always using 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 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 just 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.
Do you need help?
Frequently asked questions about menstrual panties
It may depend on the materials your panty is 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 panty's absorbency, which is indicated by drops. We have period underwear for both moderate and heavy bleeding.
If you bleed very heavily, you can advantageously 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 period underwear instead.
At the bottom of the panty is a discreet strip of fabric sewn in.
Regardless of the style, the bandage consists of a minimum of 3 absorbent layers - a top layer, which guides the liquid down into the next layer, which is reminiscent of a towel. At the bottom you will find a membrane which ensures that the liquid does not pass through the panty.
👉Read more in our guide to period underwear.
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 our full 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'll need 10-12 pairs - depending on how easy you have access to a washing machine.
But do you only use absorbent panties only for yours period, then we suggest 5-7 pairs.
The more panties, the easier everyday life.
That's why we also offer bundle discounts on several pairs.
"Leakage" is not really a word we think is 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' on capacity, then you bleed out to the sides.
You can believe they are!
The Consumer Council Tænk has put a lot of focus on period underwear in 2022, and their experts also approve of the method:
1) Rinse in cold water.
2) Wash at 40 degrees.
3) Air dry on a string.
👉 Read the whole our guide to how to take good care of your panties here.
Best basic. And with a low waist.
Period Flow Brief - Low rise is a simple but good period brief without so many frills for moderate bleeding. Still with soft organic cotton as the outer layer, still with our buttery soft signature elastic at the waist with a discreet tone-in-tone logo, which ensures that the panties stay where they should be – without tightening or chafing.





Material
Washing guide
How does it work? period underwear