Period panties guide

Period panties guide

Say hello to the future of period protection from Female Engineering. This guide covers all you need to know about reusable menstrual underwear. Ready, set, flow!

How do period panties work?

Period panties are just like regular underwear but with built-in protection that absorbs menstruation blood, prevents leaks, controls odour, and wicks moisture. The secret is the Engineered Leak Tech™ – a patented technology consisting of three different layers working together to keep you dry, safe and comfortable. Wear your period panties for up to 12 hours. Then wash, dry, and wear them again and again. 

How to choose period-proof panties

Let’s get started on finding the best period panties for you. Here’s all the steps you need to think about when choosing your new menstrual underwear.

1. Find your period panty fit

Start with choosing your favourite period panty style from Female Engineering's extensive range, whether you prefer briefs, boxers, or nearly invisible design. Perhaps different days call for different fits? For example, you may want a pair of Sleep period panties for heavy flow days, some classic brief period panties for those days in between, and a thong for the last few days where you just want to feel secure. No matter your unique flow, there are fits to match your body.

Hiphugger

A tried and true essential with a semi-low rise, comfy fit with no-show coverage.

High Waist

The sky is the limit with this high-waisted, stretchy fit that stays comfy and secure all day and night.

Thong

Minimal coverage but with the same comfort and protection.

Boxer

The queen of comfort gives you a relaxed, full-coverage fit from sheets to streets.

Brief

Our classic brief with light coverage, a low waist and high cut leg. 

Brazilian

A cheeky fit with just the right coverage for lighter flow days.
A woman in a pair of black Sleep period-proof panties.

Sleep

Sleep through a flood with the highest absorbency level, an extended gusset and extra front to back coverage.

Teen

Comfort and confidence from the first period. A soft, flexible fit specially made for teens.

2. Find your absorbency level

Female Engineering’s period panties offer various absorbency levels, no matter if you have a light or heavy flow.

Mini and Light are perfect for lighter days, at the beginning or end of your period. Mini offer reliable coverage when a panty liner would suffice.

Medium and Mid-High are ideal for steady days in the middle of your period. Equivalent to changing regular pads or tampons every four hours or three times a day.

High and Super absorbency levels are designed for heavy flows, equivalent to changing a regular pad or tampon five times a day. Experience our most high-performing protection throughout your period.

An image showing 5 illustrated drops where one is highlighted to show that the garment absorbs up to 5 ml.

Mini

Absorbs up to 5 ml 1/2 tampon/1 panty liner
 An image showing 5 illustrated drops where two are highlighted to show that the garment absorbs up to 10 ml of liquid.

Light

Absorbs up to 10 ml 1 tampon/pad
 An image showing 5 illustrated drops where three are highlighted to show that the garment absorbs up to 20 ml of liquid.

Medium

Absorbs up to 20 ml 2 tampons/pads
 An image showing 5 illustrated drops where four are highlighted to show that the garment absorbs up to 30 ml of liquid.

Mid-High

Absorbs up to 30 ml 3 tampons/pads
 An image showing 5 illustrated drops where all five are highlighted to show that the garment absorbs up to 40 ml of liquid.

High

Absorbs up to 40 ml 4 tampons/pads
An image showing 5 illustrated drops with all five highlighted. There is also a plus on the illustration to show that the garment absorbs up to 50 ml of liquid.

Super

Absorbs up to 50 ml 5 tampons/pads

3. Find your size and waist rise

When it comes to sizing of period panties, we recommend choosing your usual size. Female Engineering's period-proof panties are designed to initially feel snug and then relax with washing and wear, ensuring the perfect fit. Sizes range from XS-3XL for women and 134-170 for teens.

Period panty size guide

Still not sure of your size? Every body is unique, so grab a tape measure and get yours measured up. Check out our size guide to find the perfect period panty for you.

4. Find your period panty colour

Express your individuality even during your period with our diverse range of colours. From vibrant and colourful options to classic hues, we value your unique style. No more worries about staining, as our gussets are always black. Choose the colour you love without compromising comfort and protection.

Swimwear with period protection

Yes, it’s true. You can swim during your period. And Female Engineering’s bikini bottoms with built-in period protection makes it even easier. Made with attention to details, patented technology and thoroughly tested, so you can make waves without worries.

What is Female Engineering?

Female Engineering is a Swedish femtech brand with the goal of reinventing female freedom. They are here to find solutions to women’s real needs through science and innovative products.
Illustration of how to take care of your period panties. Rinse, wash, dry.

Period panty care guide

Frequently asked questions

Are period panties leak-proof even if you bleed heavily?

Female Engineering make period-proof underwear for all flow levels, from light to heavy bleeders. For those that bleed more, we recommend starting out by wearing the period panty at home during a heavy bleeding day. That will put it to the test and make it easier to figure out how it works.

How long do period panties last?

Female Engineering’s period panties are made to last at least 50 washes. The number of washes is determined by the gusset absorption layer in the Engineered Leak Tech™, which is treated with an odour control treatment that controls the development of odour in the panties. It tends to lose a little bit of effectiveness after 50 washes. It is likely that the function of the panty will last longer though, but 50 washes is what we can guarantee. However, the fabric, form and fit of the panty will last a lot longer. If a panty is worn and washed once per menstruation cycle, it will last around 4 years.

How much blood can the period underwear hold?

Our period-proof underwear come in different absorbency levels, much like disposable menstrual products. Here are all our absorbency levels: 5 ml Mini ≈ ½ tampon/panty liner 10 ml Light ≈ 1 tampon/pad 20 ml Medium ≈ 2 tampons/pads 30 ml Mid-High ≈ 3 tampons/pads 40 ml High ≈ 4 tampons/ pads 50 ml Super ≈ 5 tampons/ pads

Can period panties be used for incontinence?

Period panties from Female Engineering are primarily designed to absorb menstrual flow, but they are also capable of absorbing a small amount of other bodily fluids if needed. Our period panties are not classified as medical products and are therefore not intended to be used for any medical purposes, such as treatment, relief of or compensation for a possible illness, injury or disability. If you experience medical problems, you should therefore firstly seek out medical guidance from a healthcare professional.