Period Briefs ‑ Moderate Flow


Reusable bikini cut period undies made with soft and breathable organic cotton. TOM Organic low-rise period underwear hold up to two regular tampons worth of menstrual blood and are available in sizes 2XS (AU 6) to 3XL (AU 20)

Product details

Organic Cotton Bikini Cut Period Underwear. This is conscious period care.


Designed to be worn alone on light and moderate flow days or on heavier days as back up protection with your Period Cup or Organic Cotton tampons, our TOM Organic Moderate Flow Period Underwear are the perfect addition to your period care routine.

Made to look and feel like regular organic cotton undies, the ultra-thin, super-absorbent gusset holds up to two regular tampons' worth of period blood. Featuring a highly breathable back panel, our organic cotton bikini underwear are perfect to wear all day and night, or during exercise. Made with soft and breathable organic cotton, the TOM Organic moderate flow Period Underwear are designed with your body and all-day maximum comfort in mind. Designed with flat seaming for a seam-free streamlined look, they’ll sit discreetly under your favourite leggings or outfits 

Our reusable period underwear range has been designed with a unique, tried and trusted 4 layer leak-proof system that uses the natural properties of organic cotton fabric to wick away moisture, absorb menstrual blood and protect against stains and leaks. This unique technology will keep you feeling comfortable and dry all day.


Once you’ve finished wearing your period undies, simply rinse and pop them into the washing machine on a cold cycle ready for their next wear. Due to the unique waterproofing layer, make sure you line-dry them and never put your period underwear in the dryer.


  • Made with soft and breathable organic cotton
  • Absorbs up to two regular tampons' worth of blood
  • Full leakproof coverage for day or night on moderate flow days or as back-up protection on heavier days
  • Change every 8 hours, after waking up or whenever you need. (May be longer or shorter than 8 hours depending on your flow.)
  • Available in eight sizes from 2XS (AU 6)  to 3XL (AU 20)
  • Super soft elastic low-rise waistband for ultimate comfort
  • Easy care: rinse in cold water, machine wash, line dry
  • Responsibly made in China.


    At TOM Organic, people and the planet are our top priority; which is why we've been making world-class organic cotton pads, liners and tampons, free from toxins, pesticides and synthetics, since 2009. 

    We’re proud to be able to support people to make empowered choices about their period care routine. That’s why we offer a full array of reusable and biodegradable products to care for your body, your flow and our planet. We’re advocates of finding the right balance for you, whatever your selection of products may be. 

    This is conscious period care for your health and the planet.


        • BODY: 95% Organic Cotton, 5% Elastane 
        • INTERNAL ABSORBENT LAYER: 85% Cotton, 15% Polyester
        • LEAK-PROOF LAYER: PUL (Polyurethane laminate fabric)
        • WAISTBAND: Elastic
        • PACKAGING: Cardboard - 100% recyclable and biodegradable



    For help on picking the right size, check out our period underwear size guide

    Based on feedback, we recommend sizing up from your regular size. (i.e. If you usually wear a size Small AU 10, we suggest buying a size Medium AU 12.) 

    Any other questions? Please refer to our Reusables FAQs

    Customer Reviews

    Based on 6 reviews

    I was VERY skeptical, but wanted to give them a try after hearing all the hype and seeing Laura Henshaw wearing them. I am converted!!! They are soooo comfy and look like normal undies. Absolutely love them.


    comfy - recommend sizing up though - better for the environment so i feel good about that!

    Comfy and environmentally friendly

    I ordered two Period Briefs - this is my first experience to try period underwear, it’s amazing product! Easy to wash, quick dry. My outfit size is AUS 6-8, but I ordered size S (10) then it fits me.

    Emma Vandegeer

    Period Briefs - Moderate Flow

    Way better than competitors

    Thinner & less nappy like than competitors, soft and sleek. Does an excellent job doing exactly what it's supposed to do. No leaks!