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 100 reviews

These period breifs were great! Can feel confident that there is zero leaks!! The only issue was the sizing. They were slightly smaller than the average size, making them a little uncomfortable. I suggest sizing up.

Jemimah Pavy

Period Briefs - Heavy Flow


I love the feeling of period underwear and they worked really well. Though your sizing runs small and I found them super tight around the legs which is super uncomfortable. I also feel as if the cut and design could be a little better.


Love these!! I was skeptical about buying them as I have heard mixed reviews about other brands, but I am so happy with them. Not bulky at all. Love love!

The best Period Undies I've Tried

These are by far the best period underwear I've tried. They are actually absorbent, comfortable and don't feel like you're wearing a nappy. Would definitely recommend over other brands.