Hi-Waist

£24.95
Hi-Waist - Light Absorbency

Light to Moderate absorbency

holds 2 tampons' worth

  • Wear for up to 8 hours on lighter days
  • Holds two tampons' worth or 15ml
  • For periods, leaks & incontinence 
  • Great for day and night.
  • OEKO-Tex certified materials

Buy more + save more.

Hi-Waist

Light to Moderate absorbency

holds 2 tampons' worth / 15ml

£24.95

  • Wear for 8 hours on lighter days
  • Holds two tampons' worth or 15ml
  • 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 thin gusset means they feel like normal undies, but keep you fresh 'n' dry all day.

Fabric + care

Inner: 95% Modal 5% Elastane 

Outer: 92% Nylon 8% Lycra 

Trim and sides: 100% Polyester, 

Gusset: Cotton, 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 420 reviews
85%
(357)
10%
(44)
5%
(19)
0%
(0)
0%
(0)
G
G.M.
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Disposable pads
M
M.
Flow: Heavy, Moderate
Products used: Tampons, Disposable pads
Fab!
L
L.
Flow: Moderate
Products used: FLUX Undies, obvs!, Menstrual cup
Love this
M
M.T.
Flow: Heavy, Moderate
Products used: FLUX Undies, obvs!, Disposable pads

What do people think?


  • 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.

  • XXS
  • XS
  • S
  • M
  • L
  • XL
  • 2XL
  • 3XL
  • 4XL

size XXS

UK 4/6   US 0/2   EU 32/34

waist 60-63cm

hips 83-86cm

size XS

UK 8   US 6   EU 36

waist 64-67cm

hips 87-91cm

size S

UK 10   US 6   EU 38

waist 68-72cm

hips 92-96cm

size M

UK 12   US 8  EU 40

waist 73-76cm

hips 97-101cm

size L

UK 14   US 10   EU 42

waist 77-81cm

hips 102-106cm

size XL

UK 16/18   US 12/14   EU 44/46

waist 82-90cm

hips 108-116cm

size 2XL

UK 20/22   US 16/18   EU 48/50

waist 91-101cm

hips 117-127cm

size 3XL

UK 24/26   US 20/22   EU 52/54

waist 102-112cm

hips 128-138cm

size 4XL

UK 28/30   US 24/26   EU 54/56

waist 113-123cm

hips 139-149cm

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 above.

Why not try some other styles...

Boyshort - Heavy Absorbency

Boyshort

Heavy Absorbency

£27.95
Bikini - Heavy Absorbency

Bikini

Heavy Absorbency

£27.95
Hi-Waist - Light Absorbency

Hi-Waist

Lighter Absorbency

£24.95
Detachable - Light Absorbency

Detachable

Lighter Absorbency

£24.95£18.71