Period underwear for heavy bleeding
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 underwear on the Danish market.
Today, we make period underwear with a focus on comfort, quality, and responsible production – created by people who menstruate themselves.
✔️ 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 freer, safer, and less complicated — without compromising on style or function.
Sincerely, Cathrine
What we are most proud of
5 great reasons why you'll love us
THE HEART IS ALWAYS FIRST
We are also here to create greater changes than just in your everyday 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 ensured the Danish women's national handball team the right to wear dark shorts during the World Championship. And we will continue.
SAFETY AND SECURITY IMMEDIATELY AFTER
Despite the 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 underwear for chemicals and use innovation without compromising your safety to solve odor 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 ensures high standards 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's about much more than menstruation. It's about a changing body - throughout the entire cycle, month after month.
That's why we are redefining what 'period products' are beyond a practical solution. The best-rated absorbent underwear, yes, but also care that supports you and your body throughout your entire cycle.
That's Flow Cycle Routine.
FAQ
How long do period panties last?
The general expectation for the lifespan of socks and underwear is about 3 years. These are garments that wear out and are used every day.
Since we don't add chemical treatments to the pad, no function will degrade.
If you take good care of your period panties and wash them according to instructions, the quality of our period panties is so good that you can easily use them for 3 years or even longer.
Here you can find our guide on how to best care for your period panties.
How do I choose the best fit for me?
We have menstrual panties that fit different bodies - whether you prefer a low rise, mid rise or high rise fit.
The Period Flow Brief and Period Flow Shorts both have a high waist, which is loved by many for the feeling of a hug around the belly.
Period Flow Cheeky has a more sporty look but with a wide and soft elastic at the waist - it is mid-rise.
Then we also have the classic low-waisted fit , which is a super nice, basic menstrual panty if discretion under the panty hem is *your thing*.
How long can I use them at a time?
It depends on your flow and your cycle day - as well as the absorbency of the panties.
But changing your menstrual panties at least morning and night is good hygiene - think of your absorbent underwear just like pads and tampons. They need to be changed every now and then.
But unlike tampons, for example, you are not at risk of Toxic Shock Syndrome, as menstrual panties are a non-invasive menstrual product.
Menstrual panties for heavy bleeding
Menstrual panties for heavy bleeding are for those who place particularly high demands on absorbency. If you have heavy periods, you know how much security matters.
At Flow, we've developed menstrual panties for heavy bleeding that combine high absorbency with comfortable fits and materials you'll want to wear all day long. Whether you're looking for extra protection at night or a solution for your heaviest days, you'll find models designed to give you peace of mind.
Would you like to see the full range of our menstrual panties, find out here.
For the days when you bleed the most
Heavy menstruation places greater demands on your underwear.
That's why we've developed models with extra absorbent panels and fits that provide increased coverage and security. Our menstrual panties are designed to help you through the days when you need reliable protection the most.
Many people also choose to combine menstrual panties with a menstrual cup or menstrual disc on the heaviest days.
Which models are best for heavy menstruation?
If you are bleeding heavily, we especially recommend:
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Period Flow Shorts – our most covering model, especially popular at night.
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Period Flow Cheeky – with an extra long absorbent panel, which provides extra protection in case of frontal bleeding or if you sleep on your stomach.
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Period Flow High Rise – a high-waisted classic with a comfortable fit for everyday wear.
Many people combine several models so that they have the right protection throughout their period.
Comfort – even on the tough days
When your period is heavy, your underwear should work with your body – not against it.
That's why our menstrual panties are developed with a focus on soft materials, good fits and discreet absorbent technology that provides comfort without feeling heavy or bulky.
From the outside they look like ordinary panties. Inside is the technology that makes the difference.
Why women choose Flow
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Menstrual panties for heavy bleeding
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Models with extra absorption
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Comfortable fits for day and night
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Shorts and models with extra long absorbent panel
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Free from PFAS and biocides
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Produced in Europe
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Developed by people who menstruate themselves
More freedom throughout your period
Heavy menstruation doesn't have to limit your everyday life.
At Flow, we work to develop solutions that give you greater freedom – whether you're at work, sleeping, exercising or on the go. Because you should be able to trust your underwear, even when your body challenges you the most.
Frequently asked questions about menstrual panties for heavy bleeding
Can menstrual panties be used for heavy menstruation?
Yes. Flow has developed high-absorbency models that are especially suitable for heavy periods. Many people also choose to combine them with a menstrual cup or menstrual disc on the heaviest days.
Which menstrual panties are best for heavy bleeding?
Our menstrual shorts, Period Flow Shorts, is our most covering model and a popular choice for nighttime. Period Flow Cheeky has an extra long absorbent panel and provides extra comfort for front bleeding or if you sleep on your stomach.
Can I sleep with menstrual panties on?
Yes. Many choose menstrual shorts or models with extra absorbency as a night solution because they provide greater coverage and comfort.
How many menstrual panties do I need for heavy periods?
It depends on your bleeding and how often you wash. Many people with heavy periods have 5-7 pairs and combine different models throughout their cycle.
Can menstrual panties replace pads?
For many, yes. With very heavy periods, some choose to combine menstrual panties with a menstrual cup or menstrual disc for extra security.
How do I wash menstrual panties?
Rinse the panties in cold water after use, wash them without fabric softener at the recommended temperature, and let them air dry to maintain their absorbency.
Is Flow free of PFAS and biocides?
Yes. All of our menstrual panties are free of PFAS and without added biocides such as nanosilver.
What if I bleed unusually heavily?
If your period suddenly becomes significantly heavier, lasts very long, or significantly affects your daily life, you should talk to your doctor. Heavy periods can have several different causes, which are important to investigate.
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