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When Thinx launched in the 2010s, the brand brought reusable period underwear to the mainstream. Just a few years later, it was revealed that the highly wicking material contained an alarming amount of PFAS, or per- and polyfluoroalkyl substances. PFAS are widely-used, long lasting chemicals that have stain-and water-resistant qualities, and they are found in everything from rain jackets to non-stick cookware. (They are sometimes even used in food packaging, and have been found in organic pasta sauces!) Even in low exposures, some PFAS are associated with harmful effects such as cancer and reproductive problems. Since the skin of the vulva is especially absorbent, finding period undies that will keep you dry and safe from harmful chemicals is extremely important. 

Today, there are dozens of natural and sustainable choices on the market focused on responsible sourcing, inclusive sizing, and ethical production. Whether you wear them on their own or as a backup for leaks, here are the best period underwear without PFAS that will keep you feeling safe, secure, and sustainable all at once.

Looking for more period-friendly products? Check out our guides to reusable pads, menstrual cups, and natural and organic tampons.

1. Modibodi

Materials | Bamboo Viscose, Merino Wool
Style Range | Bikini, brief, boyshort, thong, tween/teen
Sizes | 3XS–6XL
Absorbency | Up to 10 tampons
Price | $19–$45 for one; multi-packs available

Modibodi is helping to combat period taboos, like with this ad originally banned on social media simply for showing menstrual blood. Today, they’re continuing the conversation by creating natural products for natural periods. These period panties are made with sustainable bamboo and merino and packaged in compostable materials. We’re big fans of their 24-hour maxi for our overnight needs, and their new biodegradable line that comes in a bikini or full brief. 

Shop Modibodi
period underwear pfas-free
period underwear pfas-free

2. WUKA

Materials | Tencel, GOTS Organic Cotton, Recycled Nylon
Style Range | Bikini, brief, high-waist, teen
Sizes | XXS–2XL
Absorbency | Up to four tampons
Price | £12–£24.99 for one; multi-packs available

WUKA is a British brand offering the very best in sustainable period underwear for teens through adults. They’re ethically made and sourced from eco-friendly fabrics like organic cotton to econyl (ocean waste plastic). Equipped with a highly absorbent layer, you can wear these for up to eight hours without a problem. A percentage of WUKA’s sales are donated to fight plastic pollution around the globe.

Shop Wuka
period underwear pfas-free
period underwear pfas-free

3. Aisle

Materials | Tencel, Organic Cotton, Recycled Polyester
Style Range | Bikini, brief, boxer brief, hipster
Sizes | XS–5X
Absorbency | Up to 11 tampons
Price | $34–$48 for one

Aisle launched the first line of modern-day reusable period products in 1993, so they understand what works best. Their period underwear—available in four styles and a wide range of sizes—is made of sustainable and recycled materials. Each pair comes with a bonus absorbency booster for heavier days, so it can hold up to an additional four tampons’ worth. As a certified B Corp, Aisle also gives back through social impact projects centered around menstrual hygiene.

Shop Aisle
period underwear pfas-free
period underwear pfas-free

7 Additional Sustainable Period Underwear Brands

While some of the below brands don’t yet have available reports on PFAS testing (or third-party reports have contested their findings), they still provide sustainable options for reusable period undies that won’t drain your wallet or fill up the landfill.

  • Sustain, $30/ one pair | XS–XL, certified B Corp, GOTS Certified organic cotton, sales support women’s health organizations
  • Ruby Love, $18+/one pair | XS–8X, organic cotton, inclusive sizing
  • TomboyX, $25+/one pair | 3XS–6XL, certified B Corp, OEKO-TEX certified cotton
  • Cora, $30+/one pair | XS–XXL, certified B Corp, OEKO-TEX certified cotton, provides period products & body literacy domestically and worldwide
  • June, $24/one pair | S–XXL, Nontoxic & natural materials, free from azo dyes, gives back
  • TOM Organic, $15+ AUD/one pair | 2XS–3XL, Certified B Corp, organic materials, eco-friendly packaging
  • Knix, $30+/one pair | XS–4XL, OEKO-TEX certified, donates bras to women’s shelters nationwide

Featured image by Modibodi