Period Briefs ‑ Heavy Flow


Reusable mid-rise period briefs made with soft and breathable organic cotton. TOM Organic midi period underwear holds up to three regular tampons' worth of menstrual fluid for a heavy flow.

Product details

The Period Brief. Know the Difference.


Designed to fit into your lifestyle, our heavy flow Period Briefs look and feel like regular underwear. A tried and tested leak-proof design, black in colour and with flat seaming for a seam-free streamlined look. Our mid-rise period underwear has been designed with a unique 4 layer leak-free system that uses the natural properties of organic cotton fabric to wick away moisture, absorb menstrual fluid and protect against stains and leaks.

TOM Organic midi period briefs absorb up to three regular tampons' worth of fluid. Perfect to wear overnight, on heavy flow days or as back-up layer of protection for a cup or tampon.


  • Made with breathable organic cotton
  • Absorbs up to three regular tampons' worth of fluid
  • Change every 8 hours, after waking up or whenever you need. (May be longer or shorter than 8 hours depending on your flow.)
  • Full leakproof coverage for day or night
  • Available in eight sizes from 2XS to 3XL
  • Super soft elastic mid-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 pads and tampons, free from toxins and synthetics, since 2009. 

We created this reusable range so you can now have the freedom to choose the best period product to suit your lifestyle. Use our Period Cup and Period Brief alongside your existing TOM Organic products or as a complete replacement.

Whatever you choose, we have you covered. 

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 10, we suggest buying a size 12). 

Any other questions? Please refer to our Reusables FAQs

Customer Reviews

Based on 85 reviews
A Fitzgerald
Good quality, great price and prompt delivery!

I have tried and own many brands of Period briefs and so I know a good pair when I get one!
My recent purchase from The TOM Co are good quality, great price and we had prompt delivery!
They are comfortable and effective.

Annalee Koernig

Period Briefs - Heavy Flow

Karen L
No leaks!

The fabric is very comfortable and the gusset does not feel bulky like some other branfds of period pants. The elastic around the edge is slightly tight ( I am usually a 12 and purchased M), which is the reason I have given 4 stars and not 5. Have tried them overnight and during the day.

Talia Zellmer
Great quality!!

Haven't tried them yet, but off the bat they are great quality! Lovely soft fabric!

Love love

I had already bought a pair of these to try and needed more because they’re great! I also use a period cup and these are great if you find you either leak or don’t always get the cup on the right spot, I mainly use them for the couple of lighter days at the end and at night (or basically if I can’t be bothered manoeuvring the cup that day). I love them! I know some ppl have said the leg holes can be tight but I haven’t found that myself. I wear the XL and haven’t had any leaks (I’m a size16/18) Definitely recommend.