High Waist - Heavy Flow
High Waist - Heavy Flow
High Waist - Heavy Flow
High Waist - Heavy Flow

High Waist - Heavy Flow

Regular price £28.95
Tax included. Shipping calculated at checkout.

Say hi to our period proof tummy-hugging Hi-Waist! These leak-proof High Waisted period panties promise to give keep you comfortable and supported during your period, perfect for those bloated days. 

Made with super soft and sustainable Micro-Modal fabric on the inside, silky smooth nylon outside, and chic mesh panels for added style. The super absorbent gusset means they feel like normal undies, but keep you fresh and dry, day and night.

  • For Periods, Leaks and Incontinence
  • Holds Four Tampons' Worth / 20-25ml
  • Wear For Up To 12 Hours Leak-Free
  • Soft, Stretchy and Comfortable
  • Lightweight and Quick-drying
  • OEKO-Tex Certified Materials
  • Free From Toxins, Chemicals and PFAS/PFOA

Materials: Body95% Nylon 5% Elastane Gusset: Absorbent Blend, 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 85 reviews
Nell Thackray (Pickering, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!
Yes! Buy them!

I bought a few pairs of these pants a couple of months ago and I love them! They are super comfy and easy to wash, and look great too! Not to mention the incredible difference they make to the environment! I would definitely recommend buying a size bigger than you normally wear as they do size quite small, and I find some pairs to be quite tight around the thigh. Also it's definitely worth getting several different pairs in a range of sizes to use on the lighter and heavier days. I really struggle with tampons and so have always worn pads -these pants make everything feel so much more neat and tidy on my period. Highly recommend!

Lisa Duguay (Buxton, US)
Flow: Super Heavy
Products used: FLUX Undies, obvs!
I live these

I have a really.heavey flow and very painful these undies have been a life saver I have many pairs they HD a lot I feel comfortable all day no leaks and super easy to care for. I love these undies!!!!

Miss Tracy Bakonyvari (London, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!
Mostly satisfied!

These worked really well but I think they could be more comfortable compared to other brands

Lizzie-may Amos (Truro, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!, Cloth pads
Size up!

These knickers run super duper small! I got a size 10 and they are very tight especially around my waist which isn't ideal since I bloat on my period. The absorbency is pretty good - sometimes I get leaks around the seams but I just make sure to wear dark clothing in case of transfer. Overall pretty good but do prefer the boyshort style as they are so much comfier and don't get issues with leaks.

Helen Mangan-Molloy (Heckmondwike, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!

Why am i only discovering these now at 47 years old? Very impressed - wish i had started using them years ago

Amy (London, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!, Disposable pads

I'm a huge fan of flux undies so I bought these without checking the reviews, because the other pairs I already owned (in a different style) fit like a dream. But these run SUPER small. I'm a size 8 and I already size up to a 10 across the whole range, but these barely fit. I don't know if it's because the mesh panels allow for less stretch, but they're very constricting around the top of my thighs and across my stomach. I'm already bloated and sore, so this really doesn't help :(

THAT BEING SAID. They are very absorbent, the actual pad part of the underwear is very comfortable- I got them for heavy flow days and it doesn't feel like I'm wearing a pad at all - and they look really cute. But please make sure you size up, I promise you'll thank me.
I tore up the packaging before trying them on so I'll be keeping hold of them for emergencies, but they definitely won't be the first pair of flux I reach for :(