Introducing Period-proof Swimwear

Step into summer, 100% leak-free

Period pants that actually work.

Try them risk-free with our money-back guarantee

The Reusable Period Pad

Ultra-thin, seamless, 100% leak-proof.
Women feeling relaxed and comfortable in colourful seamless period pants

Shop seamless period undies

Perfect to wear under just about anything!
Two women stretching with cloudy backdrop wearing boxer short style period underwear for sleeping

Sleep better in Sleep Short

Maximum period protection - holds 5 tampons' worth of blood
Press that have written about FLUX Undies period pants
List of press that have written about FLUX Undies period pants
Period Pants, Knickers or Underwear?

Call them what you want! Here at FLUX Undies, we make super absorbent, eco-friendly period pants that keep you dry and comfortable all day.

We have a fabulous selection of period underwear, from shorts to thongs, boxers to briefs, find your favourite style and make a change today.

Tired Of Leaks & Stains?

We designed our leak-proof period underwear to keep you protected from any leak life might throw at you.

From periods, to bladder leaks, to pregnancy - our period pants replace disposables and absorb up to five tampons' worth of liquid, keeping you covered when you need it most.

Upgrade your period.

How Do Period Pants Work?

Our period pants absorb up to 5 tampons' worth of liquid, yet they look and feel just like regular undies.

Our built-in tech is moisture-wicking, absorbent, and leak-proof, keeping you fresh and dry all day long. 

It's simple. Just wear, wash and reuse.

Blood, Sweat, Whatever.

How Do Period Pants Work?

Our period pants absorb up to 5 tampons' worth of liquid, yet they look and feel just like regular undies.

Our built-in tech is moisture-wicking, absorbent, and leak-proof, keeping you fresh and dry all day long. 

It's simple. Just wear, wash and reuse.

Blood, Sweat, Whatever.

Meet The Best Sellers

Try Them Risk-Free

If you're not period-ing better within 60 days of purchasing your new period pants, simply get your money back.

Risk-free. Hassle-free.

Sustainable Production

Our eco-friendly material is sustainably sourced in Austria
Women feeling relaxed and comfortable in colourful seamless period pants Women feeling relaxed and comfortable in colourful seamless period pants

Build A Set & Save Money

build a set of four or more to make serious savings

Ethical Production

We work with our factories closely to ensure ethical production
Kind To Your Body. Kind To The Planet.

Switching to our comfortable and eco-friendly period underwear reduces your waste and saves you money. It's a no-brainer.

Diagrams showing the benefits of using period pants
Diagram showing the benefit of using period pants over disposable period products
Risk free 60-day money back guarantee.