Say hello to our exclusive range of Cotton On Body x TOM Organic period undies!

Our mission has always been to provide you with even more choices that are gentle on you, and the planet.

Our new partnership means you can choose from the fits and prints from Cotton On Body you know and love, with the same TOM Organic signature soft and breathable organic cotton and four-layer leak-proof technology you trust. Meaning you can feel confident, comfortable and cute on your period every cycle.

Shop BODY x TOM Organic Undies

How do they work?

We’ve got you covered with a four-layer protection plan, keeping it breezy on the top layer with organic cotton. It’s in the middle where the magic happens. The second layer is composed of super absorbent fibres, and the third layer is the crucial leak proof barrier. And finally, in the Brasiliano, Shorty and Bikini styles there’s another organic cotton layer, and in the Boyleg style the last layer is an extra-absorbent dry-touch layer.

Finding the right fit

The BODY x TOM Organic undies have a slightly different fit than our TOM Organic Period Brief sizing. The sizing is around half a size smaller than our TOM Organic Period Brief sizing. We suggest using our conversion and measurements tables to find the perfect fit for you.


TOM Organic Cotton On Body AUS/UK USA EUROPE
2XS XXXS 4 0 32
XS XXS 6 2 34
S XS 8 4 36
M S 10 6 38
L M 12 8 40
XL L 14 10 42
2XL XL 16 12 44
3XL 18 14 46


This conversion chart is a guide to help you understand what Cotton On Body x TOM Organic sizing is right for you. When purchasing the original TOM Organic Period Briefs (Mid Rise or Bikini) please use the TOM Organic sizing chart.


TOM Organic Cotton On Body x
TOM Organic
2XS 58 83 60 85
XS 63 88 65 90
S 68 93 70 95
M 73 98 75 100
L 78 103 80 105
XL 83 108 85 110


Hip is measured 20cm below waist – around the largest part of your bottom. Waist is measured around the base of your belly button.

Cotton On Body x TOM Organic sizing is slightly larger than the TOM Organic original sizing. TOM Organic sizing runs small and we suggest sizing up. Cotton On Body x TOM Organic is truer to size.

How does the 4-layer protection work?

We call it zero-fear protection—and we mean it! Every pair has been designed with 4-layer protection that is moisture-wicking, odour-controlling, super-absorbent and leak resistant to keep you feeling dry and fresh. Here’s a breakdown of each layer:

    Draws away moisture and dries quickly. In the Brasiliano, Shorty and Bikini it’s made from breathable organic cotton. In the Boyleg, it’s an extra-absorbent dry-touch layer.
    Ultra-absorbent core locks away liquids and odours, to keep you feeling fresh and dry.
    Flexible, soft and water-repellent to prevent leaks.
    Soft and breathable for all-day comfort.


What styles are available in the partnership?

  • Brasiliano suitable for light flow, absorbs up to 1 regular tampon
  • Shorty suitable for light flow, absorbs up to 1 regular tampon
  • Bikini suitable for moderate flow, absorbs up to 2 regular tampons
  • Boyleg suitable for heavy flow, absorbs up to 3 regular tampons


What styles are available on TOM Organic Website?

We have two styles available in two different prints.


Where can I purchase the Body x TOM Organic Underwear?

We have selected styles available on our website. Alternatively, you can buy the full range in Cotton On Body stores and online at