Hi-Waist

£28.95
Hi-Waist - Heavy Absorbency

flow: heavy

HOLDS 4 TAMPONS' WORTH / 20ml

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

Buy more + save more.

Hi-Waist

flow: heavy

holds 4 tampons' worth / 20-25ml

£28.95

  • Wear for up to 12 hours on heavier days
  • Holds four tampons' worth or 20/25ml
  • For periods, leaks & incontinence 
  • Great for day and night.
  • OEKO-Tex certified materials

Buy more + save more.

Style + fit

Made with soft 'n' sustainable modal fabric on the inside, smooth nylon outside, and chic mesh panels for added style.

The super absorbent gusset means they feel like normal undies, but keep you fresh 'n' dry all day.

Fabric + care

Inner: 95% TENCEL™ Modal 5% Elastane

Outer: 92% Nylon 8% Lycra, 

Trim and sides: 100% Polyester 

Gusset: Absorbent blend, Breathable PUL


Care: Quick rinse 🚿 40 degree wash 👌🏽 Hang to dry ✌🏿 No bleach or fabric softener ⚠️

Sustainably sourced

Fast + free UK shipping

Ethically manufactured

We give to girls in need

Customer Reviews

Based on 82 reviews
76%
(62)
16%
(13)
9%
(7)
0%
(0)
0%
(0)
L
L.A.
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.

H
H.M.
Flow: Heavy
Products used: FLUX Undies, obvs!
SUPERB!

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

A
A.
Flow: Heavy
Products used: FLUX Undies, obvs!, Disposable pads
MAKE SURE TO SIZE UP

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 :(

U
U.G.
Flow: Heavy
Products used: FLUX Undies, obvs!, Menstrual cup
Made life easier

I love these period panties. Mostly used them at night. No leaks, no discomfort, just happiness. The only thing you need a couple of them- takes couple of days to air dry.

  • How They Work
  • Money-Back Guarantee
  • Find Your Size
  • FAQ's

Moisture-wicking

Soft material wicks moisture and dries fast

Anti-microbial

Prevents bacteria building up and keeps smells away

Super absorbent

Absorbs liquid without feeling bulky or heavy

Leak-proof

Breathable layer prevents leaks and stains

Moisture-wicking

Soft material draws moisture away and dries fast

Anti-microbial

Prevents bacteria building up and keeps smells away

Super absorbent

Absorbs moisture and liquid without feeling heavy or bulky

Leak-proof

Breathable layer prevents leaks and stains all day

try our period-proof undies risk-free

if you're not period-ing better within 60 days, we'll give you your money back. no questions asked.

what is your return policy?

We offer free returns and exchanges within 60 days of purchase, no questions asked! Just visit our Return & Exchange Centre to get started.

how long can i wear them?

If cared for properly, our undies are likely to have a maximum tech performance of approximately 3 years. This means washing them on a 30-40 degree wash with the rest of your delicates, never using bleach or fabric softener, and hang drying! In terms of length of wear, we measure our undies by absorbency with our highest absorbency styles holding 4 tampons worth of fluid. For some customers, that means wearing them the whole day and for others that may mean carrying an extra pair of FLUX Undies as a backup. 

how do they work?

FLUX Undies are underwear that absorbs your period. Every pair is made with technology that absorbs your flow, wicks moisture, controls odour, and prevents leaks — leaving you fresh and dry. Take a look at our How it Works page to learn more.

how do i find the right size?

We recommend following the hip measurement, as most of our styles sit on the hips. Be sure to measure your hips at their widest point to find the most accurate size for you! In case you don't have a tape measure, you can use the size you usually are most comfortable with for your underwear. We recommend the undies fit snuggly, but not so tight that it's uncomfortable. For reference, you can check out our size chart.

A style to suit you

Meet our other styles

Boyshort

flow: heavy

£27.95

Hi-Waist

flow: heavy

£27.95

Bikini

flow: heavy

£27.95

A style to suit you

Meet our other styles

Boyshort

£27.95

heavy flow

Hi-Waist

£28.95

heavy flow

Bikini

£27.95

heavy flow