Ribbed Cotton Thong
Ribbed Cotton Thong
Ribbed Cotton Thong
Ribbed Cotton Thong
Ribbed Cotton Thong

Ribbed Cotton Thong

Regular price £10.95 Sale price £5.95
Tax included. Shipping calculated at checkout.

This leak-proof Thong is perfect for light leaks, sweat, and your lightest days towards the end of your period. Bye-bye pantyliners! 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 Half A Tampon or 1 Pantyliner / 3-5ml
  • Wear For Up To 8 Hours Leak-Free
  • Soft & 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 2 reviews
L.C. (Dublin, IE)
Flow: Heavy, Moderate
Products used: FLUX Undies, obvs!, Cloth pads, Menstrual cup
Good protection, not the comfiest

Bought light - flow thong to wear on day 5 of my period, and while it's great for absorbency (I feel 100% safe with no cup) the thickness of it is not ideal for a thong. It's not very comfortable compared to regular thongs or the other Flux undies I bought (hipster). I guess I should have expected as much! Might try the seamless thong one day, maybe they have less fabric... or maybe just give up on my dreams of wearing thongs while I'm bleeding!

Anonymous (New Cross, GB)
Flow: Super Heavy, Heavy
Products used: FLUX Undies, obvs!, Tampons, Disposable pads
A little on the small side

These look very cute, especially the grey colour. I usually wears XS in all the other flux knickers and I generally wear a size 8 in knickers. These felt a little bit tight though I’m not sure if the S would have been too big. They’re still wearable for sure but not as consistent with the sizing as other flux knickers. I really love wearing them towards the end of my period when I’m not sure when it’ll actually end.