How Do Period Pants Work?

Say hello to clever underwear that absorbs your period.

Our reusable, washable underwear is designed to completely replace disposable pads and tampons, giving you protection when you need it most. But just how do period pants work?

That’s the thing! All our pairs look like regular undies, but they work like *magic*

Three layers of fabric absorbing liquid showing how period pants work

The secret's in our built-in tech.

Every pair of our undies are made using built-in triple layer tech that keeps you fresh, dry and protected, through even the heaviest of flows.

1. Moisture wicking: The top layer of our period underwear wicks moisture away quickly, keeping you dry

2. Odour controlling: The construction of our materials prevents bacteria from building up, keeping away those unwanted smells

3. Super absorbent: This clever layer is made to absorb and hold up to five tampons’ worth of blood

4. Leak-proof: This final, breathable and waterproof fabric prevents leaks and stains, guaranteeing complete leak protection and security throughout the day

Risk-free 60-day money back guarantee

Wash and Care

1. Rinse

Simply rinse after use, until water runs clear

2. Wash

Machine wash at 30-40 degrees (no fabric softener, pls!)

3. Dry

Hang to dry or dry on radiator (please do not tumble dry)

How much can FLUX Undies period pants absorb?

Depending on the style, our unique built-in panel can absorb up to five tampons' worth of blood. This means you won’t have to carry around spare sanitary pads or other menstrual products in your pocket or bag all day!



How long do your period panties last? 

One pair of our undies is designed to last for around 3 years, with the proper care we’ve already said about. 

This handy info is based on using a pair of period underwear once during each cycle for three years ‒ that’s also over 200 pads or tampons you’ll be stopping from going to a landfill!Is it hygienic to wear them all day?

Yes! Our period pants contain unique antimicrobial properties which naturally occur due to the construction of the fibres, and there are no added toxins or chemicals! 

This means you can stay feeling fresh, dry, and fabulous with our day pairs for up to 8 hours, or 12 hours if you’ve slipped into a pair of our overnight sleep shorts.

Do period pants completely replace other period products?

They certainly can. Our underwear comes in a range of different absorbencies and are all designed to absorb up to five tampons’ worth of menstrual blood, so they work just as well as any pad or tampon. 

They’re also perfect for wearing alone, so you can say goodbye to other menstrual products from here on out!

Will they smell or feel wet?

Nope! And how does it work, exactly? It works because the antimicrobial properties prevent bacteria building up to stop any smells, and our materials wick away moisture quickly, keeping you dry!

How will I know when my period proof underwear is getting full?

A good way to tell if your period pants are full or getting full is looking at the side seam and seeing if there’s blood. Of course, over time you’ll start to get a sense of how long you can wear certain pairs of our undies, and which ones work best for the different days and flows of your cycle. 

When you buy and start trying out your first pairs of period underwear, we’d always recommend taking an extra pair with you and changing early if you’re not sure how long you can wear them for. Whatever makes you feel most comfortable until you’ve had some practice!





Start off with cash-saving mix ‘n’ match bundles

Want to make the switch and save yourself some cash? Why not start your new period underwear collection with a mix 'n' match bundle set that covers every kind of flow in a cycle and every fashionable style?

Get 10, 15, or even 20% off by picking out everything from boy shorts to high waist pairs today and watch your savings start to stack up!



Upgrade your period

Now that you know how period pants work, why not pick a few pairs and try them out for your next cycle? They’re best tested over a free weekend, so you can always stay home if you know you’d feel better about trying them in privacy and comfort. 

We’ve also got a 60-day money-back guarantee if you’re not totally satisfied with how our pairs work for you, so you’ll never be losing out! 

Take a look at our best pairs of period underwear and make the switch to a permanent period product solution today!