Menstrual panties – all you need to know about function and care
For many, menstrual panties have become the preferred alternative to pads and tampons. They combine comfort, security, and functionality, and can be used both on their own and as a supplement throughout your period.
We've gathered everything you need to know about menstrual panties—from how they work, and what absorbency and flow mean, to why so many people love them, and how to wash and care for them to ensure they last as long as possible.
What are menstrual panties?
Menstrual panties are a type of underwear with built-in protection that can absorb menstrual fluid without the use of disposable products. They look like regular panties but are constructed with multiple technical layers to ensure both comfort and protection.
This means:
- Protection is integrated into the panty
- No glue, plastic, or separate pads
- Wash and reuse again and again
How do menstrual panties work?
Menstrual panties consist of multiple layers, each with its function:
- Moisture-wicking layer that draws fluid away from the skin, keeping the surface dry
- Absorbent layer that captures and holds fluid securely inside the panty
- Leak-proof barrier that prevents leaks from reaching your clothing
Together, these layers provide a reliable and comfortable solution that feels like ordinary underwear.
Why do we love menstrual panties?
We love them because they:
- Feel like completely ordinary underwear
- Offer secure protection without bulk
- Are a reusable choice
- Work both alone and as a supplement
- Are particularly comfortable at night
- They’re also suitable for light incontinence or discharge.
For many, they quickly become a staple in the wardrobe.
What is the absorbency of menstrual panties?
When we talk about absorbency in relation to menstrual panties, it’s about how much fluid the panty can absorb and securely hold without feeling wet or causing leaks.
Absorbency is often measured in millilitres (ml) and can be compared to traditional menstrual products.
As a rule of thumb:
- Approx. 10–12 ml equals 1 tampon (light flow)
- Approx. 13–19 ml equals 2 tampons (medium flow)
- Approx. 30–35 ml (heavy flow)
This makes it easier to determine when and how the panty suits your needs, whether used alone or as a supplement.
You can always find the specific absorbency for each model in the product description on the website.
How to wash menstrual panties
To preserve both fit, function, and absorbency, it’s important to always follow the washing instructions provided on the panties. Menstrual panties can vary in construction depending on material and technology, so care can vary from product to product.
Below are general guidelines that can serve as inspiration if the washing instructions permit.
Brief version: Rinse in cold water first, wash at a maximum of 30 °C, avoid fabric softener and tumble drying, air dry.
• Rinse after use
Rinse menstrual panties in cold water until the water runs clear.
Avoid hot water as it can cause blood and fluid to set in the fibres, reducing the panties’ effectiveness.
• Machine wash
Wash panties on a gentle cycle at a maximum of 30 °C if the washing instructions allow.
Use a mild, liquid detergent without bleach and without fabric softener, as fabric softener can damage the absorbent and protective layers.
• Use a wash bag
A wash bag protects the technical layers and reduces wear during washing.
It helps maintain both fit and absorbency over time.
• Drying
Always avoid the tumble dryer unless specified otherwise in the washing instructions. Air dry menstrual panties flat or hung up, ideally away from direct sunlight and heat sources, to preserve their elasticity and functionality.
How to make your menstrual panties last longer
- Avoid fabric softener and bleach
- Wash at low temperatures
- Always air dry
- Follow the washing instructions on the panties
Frequently Asked Questions
Can menstrual panties be used all day?
Yes, depending on your flow and the panty’s absorbency. In case of heavy flow, it might be necessary to change during the day.
Do they feel wet to wear?
No, the moisture-wicking layer helps keep the surface dry.
Are they hygienic?
Yes, when washed correctly, they are both safe and hygienic.
Can they be used with other products?
Yes, some people use them as a backup for a tampon or menstrual cup.
Are menstrual panties only for menstruation?
They can also be used for light incontinence or discharge, depending on the model.
Can you bleed too much for menstrual panties?
No, there is no “wrong” flow. Some people bleed more than others, and that’s completely normal.
If you have a very heavy period, menstrual panties can still be a great solution, either:
- In models with high absorbency
- As backup alongside a tampon or menstrual cup
- By changing panties during the day
The most important thing is to choose a solution that matches your flow and lifestyle.
Yes, period panties can be washed by hand with cold water and a mild detergent. This is a gentle way to clean them and can extend their lifespan.
Yes, you can wash period panties with your regular underwear and clothing. Be sure to select a gentle cycle and use a mild detergent.
To shorten drying time, you can hang period panties to dry with the outer layer facing outwards. This allows the outer absorbent layer to dry faster.
It depends on your menstrual flow. On days with heavier bleeding, it may be necessary to change them more frequently, while on lighter flow days, they can last all day.
It's recommended to have 3-4 pairs for light flow and 5-7 pairs for moderate to heavy flow, depending on how often you wash them.
Yes, many women use period panties as an extra layer of protection alongside tampons, menstrual cups, or pads, especially on heavier flow days.
With proper care, our period panties can last up to 2-3 years. It is important to follow the care instructions closely to extend their lifespan. Zizzi period panties may lose some absorbency after 20 washes.
Period panties are washable and reusable, making them a good alternative to pads and tampons.
