Period Proof Underwear • bikini brief

No wetness, no leaks, no worries. This underwear easily soaks up 3 medium tampons worth of blood, so you can wear them on their own, or team them with a tampon or cup on very heavy days – whichever combination works for your flow. Easy to clean: rinse, wash, air-dry, and wear them again.

+ Product details

  • Style: Bikini brief.
  • Easily holds up 3 medium tampons worth of blood.
  • Ultra-thin absorbent layer.
  • Comfortable & leak free.
  • Co-created exclusively for Yoni by the women of Runes Movement.
  • Ethically produced in Portugal.

Read more about Period Proof Underwear


+ Materials


Made from soft, stretchy cotton (96% certified organic cotton, 4% elastane) with an elastic waistband.

Absorbent layer

The ultra-thin absorbent layer is made from microfelt followed by a leak-proof layer made from recycled polyamide.

+ Care instructions

  • We recommend you to wash before wear.
  • Rinse, wash at max. 40 degrees and air dry only. After washing the absorbent layer can take a day or two to air dry. We recommend having a few pairs to wear thoughout your period week.
  • Don’t use fabric softener



Save with period week bundles 

Buy 3 – 4  and get 15% discount
Buy 5 – 6 and get 20% discount
Buy 7 + and get 25% discount.


Made from certified organic cotton with an ultra-thin absorbent layer.

Highly absorbent

Absorbent layer made with a technology exclusively designed for Yoni.


Wear, wash & wear again.

What They Said

33 ReviewsBased on 33 reviews

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What They Said

  1. Sarah

    Felt very secure and felt much cleaner than using pads and not wet at all

  2. Julie

    Not having to put anything inside is a relief. The fit was perfect, it is easy to wear and is comfortable

  3. Kelsey

    By wearing it, I did not feel like i was on my period!

  4. Isabelle

    I was worried about the fit, but it wears like regular underwear. Also it didn’t require as much time to dry after washing them.

  5. Barbara

    Nice shape and comfy

  6. Catherine

    The fit, it took a day or two to feel comfortable with only wearing the underwear, after being conditioned to need additional protection but after two days and no accidents it was the best feeling!

  7. Lara

    The fit is perfect and incredibly comfortable, material is breathable and so easy to wash. Because it’s black it’s elegant as well

  8. Annebel

    No more worrying, its very comfy! It feels fresh and clean.

  9. Maria

    The cut is stylish and still sexy, it’s good looking underwear.

  10. Jessica

    A sustainable and comfortable way to manage periods.

  11. Alex

    It is really absorbent

  12. Manon

    When I wear it, I am carefree throughout the day

  13. Lilian

    I really like the simple design and not visible pad

  14. Clara

    I think it’s a beautiful model and it felt very comfortable

  15. Caressa

    Its very personal what people want to wear. I do think the experience of period underwear creates safety for those tampon users or low flowers.

  16. Paula

    The design and fit are great, also the absorption. I already recommended it to some of my friends. It’s really nice to have this as another option next to tampons, pads and cups.

  17. Rosie

    So so easy to use and way more comfortable than pads or tampons, leakfree and you don’t notice it has absorbed blood.

  18. Grita

    Perfect fit, on my heaviest day it did the job!

  19. Rachael

    It’s even more comfortable than normal underwear & I’m stunned that it doesn’t leak.

  20. Eliane

    It’s very comfortable, and no need to change during the day.

  21. Lilly

    I like the fact that it feels like regular underwear. it doesn’t feel like a big bulky thing between your legs and yet you still feel “safe”.

  22. Carmen

    It is really comfortable, way more comfortable than regular pads, and also easy to use.

  23. Michelle

    I really liked the design.

  24. Evie

    The period pants look and feel so sexy. I feel very unsexy when I’m on my period and never dare to wear nice underwear. But this only comes in a nice shape.

  25. Lisa

    I love the feeling of security when wearing it!

  26. Hanneke

    I like the option of not having to use pads or tampons

  27. Laura

    It feels more environmentally friendly than pads!

  28. Eva

    There is more ‘breathing room’ for the vagina. Less sticky and sweaty than when using sanitary pads.

  29. Sheavaun

    The underwear feels a bit stiff at first, but after a few hours of wearing it feels really nice.

  30. Samara

    Perfect for night use and they look beautiful

  31. Elisa

    Nice design, it is a nice panty to wear. I mostly wear them at night and I would recommend them for that.

  32. Danique

    I love the fact that I can sleep through the night now.

  33. Celeste (verified owner)

    Perfect. Thin, comfy and absolutely leak free.

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Frequently Asked Questions

  • How do Yoni Period Proof Underwear work? + -

    Yoni PPU is reusable and is made to absorb your period. It can totally replace the need for disposable products like liners, pads and tampons or can be used as back up. Every pair is made with material that’s moisture-wicking, super-absorbent and leak-resistant. This means they keep you fresh and dry, and are ultra thin for ultimate comfort. Take a look at our Period Proof Underwear page to learn more.

  • What makes Yoni Period Proof Underwear special in comparision to other period underwear? + -

    A lot of period underwear are bulky, especially in the gusset (the crotch area). You might feel like you’re wearing a thick pad or not want to wear your shorter shorts. Yoni underwear is very thin and super-absorbent. This makes them super comfortable and flexible, allowing you to forget your wearing special underwear during your period.

  • How much blood will my Yoni Period Proof Underwear absorb? + -

    Our Yoni Underwear absorbs 30ml of liquid. That’s approximately as much as 3 medium/ normal tampons’ worth of fluid.

  • Can I use fabric softener when I wash my Period Proof Underwear? + -

    No, we strongly recommend to not use fabric softener cause it will affect the functioning of the superabsorbent layer inside the underwear.

  • Can Yoni Period Proof Underwear replace my current routine e.g. my use of tampons, pads and liners? + -

    Depending on your flow Yoni Period Proof Underwear can replace tampons, pads, liners and cups or be worn with tampons and cups for extra protection. Our current underwear absorbs 30ml of liquid, which is approximately as much as 3 normal tampons’ or pads’ worth of fluid.

  • How long will my underwear last? + -

    Our PPU can last for approximately 2 years or even longer. However, this depends on the wash and care. As underwear is considered a delicate product, we strongly recommend to follow our care instructions How do I care for my Yoni PPU? to ensure you get the most wear out of your underwear.

  • How do I care for my Yoni underwear? + -

    Treat Yoni PPU like any other delicate garmet you love! When washed with care, your Period Proof Underwear will maintain their super-absorbent functionality for approximately 2 years or even longer.

    Step 1. Rinse in cold water after use to remove any excess flow.

    Step 2. Throw your underwear in with your regular dark wash and wash at a max. of 40 degrees. Using a delicate bag can protect your underwear from things like zippers!

    Step 3. Air dry only. Do not use a dryer and note that it may take a couple of days to completely dry the super-absorbent layer. 

    Step 4. Reuse and Repeat!

  • Will my Yoni Period Proof Underwear smell? + -

    No, if you follow our care instructions, your Yoni underwear shouldn’t smell. However, if you feel they need a little bit of extra love or they might be smelling a bit musty if stored before fully dry, try soaking in vinegar. Put 1 cup of vinegar in a clean sink or bowl and add in 2 cups of water. Let your underwear soak for 15 to 30 minutes. Then toss them in the washing machine as usual. 

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