FLUX Hi-Waist

holds 4 tampons' worth

Say hi to our hi-waist! 

This baby is guaranteed to give you the most coverage, perfect for those 'blah' days when you need the most protection and support.

If you're all about comfort, Hi Waist is perfect for you.

Say hi to our hi-waist! 

This baby is guaranteed to give you the most coverage, perfect for those 'blah' days when you need the most protection and support. Holds up to 4 tampons' worth, so you can wear them alone and be protected, no matter what your flow.

If you're all about comfort, Hi-Waist is perfect for you.

  • Wear for up to 12 hours
  • Holds 20-25ml, or four tampons' worth 
  • For periods, leaks & incontinence
  • Great for day & night.
  • Sustainable and OEKO-Tex fabrics

Hi-Waist - Heavy AbsorbencyHi-Waist - Heavy Absorbency


Holds 4 tampons' worth


Interior: 50% Modal 50% Organic Cotton, Exterior: 82% Nylon 18% Lycra, Trim: 100% Polyester

Due to the high demand - Sizes Medium & Large are currently out of stock & are due back in within 2 weeks.



Give 'em a quick rinse 🚿


Chuck 'em in a mesh laundry bag before popping them into the machine on a cold wash 👌🏽


Hang to dry outside or inside! ✌🏿

PS: Don't use bleach or fabric softener ⚠️

Customer Reviews

Based on 35 reviews
Flow: Super Heavy, Heavy
Products used: FLUX Undies, obvs!, Menstrual cup
Pros and Cons

5 stars for the first design, 4 for the current one. I'm a lucky owner of 2 pairs of the previous design in size S. Ordering the new ones in size M, I did not expect them to feel smaller than S. They do look bigger, but the cut and elastic are much much tighter. They do not seem to be as high-waisted as the previous model either.
Other than that? The undies are great. They do soak up whatever my cup can't hold, secure my sleep, and save me during long shifts.
I used to cope with just 2 pairs by handwashing them twice a day, hanging them on a mid-heat radiator, then letting them dry completely at room temperature. Handwash might make them last longer, yet it's probably wise to put them next to the laundry at the end of your cycle out of hygiene reasons.
Since I travel a lot, I now have 6 pairs in total and carry a spare one with me. However, I do suggest that the used undies go into the washing machine the same day. :)

Flow: Heavy
Products used: FLUX Undies, obvs!, Disposable pads

So I have been wanting a pair of period pants for a while, but struggle to find them in fat girl size. I bought these when I was on my last period and they arrived the day after I finished. I still tried them out to see how they felt, and was really pleased as they were really comfy and didn't make me hot. So now I'm actually on my period I've tried them again.... and hurrah no issues! It's a heavy flow day and there has been no leaking onto clothes, been comfortable all day and even after going to the gym too they are not uncomfortable or damp (ie not holding the sweat in). I'm buying more of these!

Flow: Super Heavy
Products used: FLUX Undies, obvs!, Disposable pads
Wish I could put 5 star

These really are amazing, however if you have really heavy periods which since reading the other reviews I’m thinking mine must be super super bad. They just don’t quite cut it I have to change quite a lot which means I’d need 4+ pairs to be able to wash and wear and at the price they are I can’t justify it. But I’m definitely impressed with them I get a good 3 hours wear which is much better that any other product I’ve tried. They are super comfy and look great!

Changing them while out and about is awkward but manageable, just have to be prepared.
The ethos is great and I’m going to persist with them to still try and cut down on the disposable items where possible.

Flow: Super Heavy
Products used: FLUX Undies, obvs!
A Godsend ....Shark Week is now safer (for others) and not a horror fest (for me)

Okay, two months in time to tell all. I'm not going to use euphemisms here I'll talk as plainly as I do to my boys. I started periods at 11yrs (80s) and before my older sister and no I hadn't had the talk - so yes I honestly thought I was dying. I could only afford the bulky long oval pads (wearing these was like walking with a submarine roll between your legs) with my pocket money - really horrid. I was going to change to tampons when I was 14, but then a class friend died of toxic shock from one and I just couldn't.

When I was 21 I went from normal to heavy and had to start double padding. I worked out that I've been paying about £60 per year on pads alone and it is stressful worrying about if I need to change when out - I could go though a whole pack of pads in a day. For the last 5 years I've been using the night time pads for day as well as night; now I'm in my 40s with no let up I wanted some relief, then I heard about these and took the plunge.

I tested them at home first:
a whole day ONE pair of knickers - OMG this was amazing - no leaks no stress no irritation from pads and crucially no instant crime scene in the bathroom.
a whole night - this was scary so I popped a towel and an extra sheet on the bed just in case - but again PASSED - no leaks.
Then the big one:
a day out - this was the scariest decision and though my bag was grateful for the lack of extra stuff I usually have to haul about with me; the first time I was very
nervous. I needn't have it went very well a full 8am-7pm trip and no leaks.

The knickers themselves are stylish and comfy, which is crucial and feel secure. Hubby didn't even realise they were the flux undies :) and this was a nice touch as it made me feel pretty when normally I feel just gross on what we call "Shark Week" - uteruses and Shark brains are exactly the same shape - explains a lot.

I'm a convert as they are easy to use and wash and I'm calmer, feel better on waking and I'm not stressed.

Flow: Moderate
Products used: FLUX Undies, obvs!, Tampons

Functionally great but way beyond high waisted! I'm a UK size 10 and got a medium and they're rib cage height which isn't the most comfortable

FLUX Undies are your complete replacement for pads and tampons and can be worn alone for up to 12 hours.

Our unique built-in tech is moisture wicking, absorbent, and leak-proof, keeping you covered day 'n' night. 

Bikini offers full coverage with no bulk, and the soft lace waistband keeps you comfy in style. 

- Wear all night, or for up to 12 hours during the day 

- Holds 20-25ml, more than any other product out there- Our customers use FLUX for periods, leaks, post-partum, and incontinence! 

- Wear them to school, work, exercise, or simply just to feel comfortable on lazy days. 

 Find out more on how our undies work.

you might also like...

Bikini - Heavy Absorbency
Boyshort - Heavy Absorbency
Boyshort - Light Absorbency