Ribbed Cotton Bikini
Ribbed Cotton Bikini
Ribbed Cotton Bikini
Ribbed Cotton Bikini
Ribbed Cotton Bikini
Ribbed Cotton Bikini

Ribbed Cotton Bikini

Sale price £18.95
Tax included. Shipping calculated at checkout.

This leak-proof Cotton Bikini is perfect for absorbing your flow and preventing leaks. Bye-bye disposables! Designed with soft ribbed cotton, they are super cute, comfortable, and can be worn under anything, whilst keeping you leak-free and protected.

The breathable fabric keeps things nice and cool, and of course, our signature built-in tech absorbs moisture and prevents leaks, completely replacing pantyliners and keeping you oh-so-fresh. 🌸

  • For Periods, Leaks and Incontinence
  • Holds 3 Tampons Worth 
  • Wear For Up To 12 Hours Leak-Free
  • Soft and Comfortable
  • Lightweight and Quick-drying
  • OEKO-Tex Certified Materials
  • Free From Toxins, Chemicals and PFAS/PFOA

Materials: Body95% Cotton 5% Elastane Gusset: 100% Cotton, Breathable PUL Packaging: 100% Recycled and Recyclable Cardboard

🍃 Bleed Green: Each pair of our period pants replace 200+ disposables from going to landfill, reducing your waste by 99.5%

🤝 Giving Back: For every purchase, we give back to a girl in need. Find out more about our #ByYouForHer giving back scheme here

We offer free shipping on all UK orders and free shipping on International orders over £75.
For same-day dispatch and next day delivery, please place your order before 1pm.
All orders are dispatched from our UK warehouse using trusted couriers such as Royal Mail, DHL and DPD. 
Think our period pants sound too good to be true? Take them on a risk-free trial for 60 days!

If our undies don't work as promised, let us know within 60 days and we'll refund you, no questions asked. The 60-day risk free trial applies to one worn pair of undies only. Refunds will be paid to the original payment method that was used to place the order.
🚿 Rinse after use.
🧽 Machine wash on 30-40 degrees.
 🍃 Hang to dry or dry indoors on a radiator.
⚠️ Do not use fabric softener or bleach. No tumble drying.
And that's it! Your FLUX Undies are ready to wear again!

Our Period Pants Are:

Sustainably Manufactured

We only use eco-friendly materials that are sustainably manufactured

Vegan and Cruelty-Free

Made from natural materials and never with animal materials or testing

Free From Nasties

Certified safe for skin and free from toxins, chemicals and fragrances.

60-Day Money Back Guarantee
How They Work

Our period pants absorb up to 5 tampons' worth of liquid, yet they look and feel just like regular undies.

Our built-in tech works like this:

1. Top layer wicks moisture away from the surface quickly, to keep you dry

2. Our middle layers absorb your blood and lock in your flow

3. The bottom layer pushes liquid back up and keeps you leak-free

It's simple. Just wear, wash and reuse.

Blood, Sweat, Whatever.

Three layers of fabric absorbing liquid showing how period pants work

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Customer Reviews

Based on 13 reviews
Gemma Hale (Radlett, GB)
Flow: Moderate, Light
Products used: FLUX Undies, obvs!, Tampons
Really comfy

These are super comfy, and lighter than the thicker ones

Anonymous (Southwark, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Tampons, Disposable pads
Look really cute

These are great for moderate days. Very light and comfortably thin. Get a little bit of VPL when worn with leggings but more because of the seems rather than the pad being thick. These actually look quite nice whilst providing a lot of coverage which is probably the biggest bonus for period knickers.

Sam (Leicester, GB)
Flow: Heavy, Moderate
Products used: FLUX Undies, obvs!, Tampons, Disposable pads, Menstrual cup
Beyond what I imagined

Comfortable, stylish, do NOT feel like a nappy (!), and leakproof. I didn’t think this was possible! I bought 2 more pairs right away :)

Grace Mantella (Frimley, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!, Menstrual cup
Love them

My favourite pair of period pants, the ribbed are the most comfortable ones I own!

Anonymous (Copenhagen, DK)
Flow: Heavy
Products used: FLUX Undies, obvs!
Comfy and cute

Like the other pairs I have from Flux, I love these. So cute and comfy. Fave period panty brand! <3

Laura (Munich, DE)
Flow: Moderate
Products used: FLUX Undies, obvs!, Menstrual cup

Super comfortable and I love how they look on me, much better than other period panties