Invisible Cheeky

£21.95
Invisible Cheeky - Black

Light to Moderate absorbency

holds 2 tampons' worth

Invisible Cheeky - Black
Invisible Cheeky - BlackInvisible Cheeky - BlackInvisible Cheeky - Black

Ultra thin, super smooth, and truly invisible. Designed with lightweight breathable nylon fabric, they're stretchy, comfortable and can be worn seamlessly under anything.

 

And of course, our signature built-in tech absorbs moisture and prevents leaks, holding up to 2 tampons' worth and keeping you oh-so-fresh. 🌸

Colours

Size

  • For periods, leaks, and incontinence
  • Wear for up to 8 hours on lighter days
  • Holds up to two tampons' worth or 15ml
  • Seamless, smooth and ultra-thin

Buy more + save more.

Invisible Cheeky - BlackInvisible Cheeky - BlackInvisible Cheeky - Black

Invisible Cheeky

Light to Moderate absorbency

holds 2 tampons' worth / 15ml

black

£21.95

Ultra thin, super smooth, and truly invisible. Designed with lightweight breathable nylon fabric, they're stretchy, comfortable and can be worn seamlessly under anything.

 

And of course, our signature built-in tech absorbs moisture and prevents leaks, holding up to 2 tampons' worth and keeping you oh-so-fresh. 🌸

Colours

Size

  • Wear for up to 8 hours on your lighter days
  • Holds two tampons' worth or 15ml
  • For periods, leaks & incontinence 

Buy more + save more.

Sustainably sourced

Fast + free UK shipping

Ethically manufactured

We give to girls in need

DETAILS

It really is in the name. Our Invisible Cheeky is ultra thin, super smooth, and truly invisible. Designed with our new soft, lightweight nylon fabric, they are super stretchy, comfortable and can be worn seamlessly under anything. No panty lines here!

Our breathable fabric keeps things nice and cool. With our signature absorbent gusset built-in, and absorbing up to 2 tampons' worth, you can wear them on your lighter days, for up to 8 hours. 

- Made from super smooth, breathable nylon fabric
- Lightweight, yet substantial 
- Seamless design
- Period and pee-proof, holding up to 15ml
- Quick-drying
- Buttery soft hand feel 
- Brushed matte finish

Dusty Rose is a deep, rich, shade of red. We think it's the perfect compliment to your period.

FIT AND SIZING

Funso is a UK 12 and wears a size M. Check out our size chart here.

SUSTAINABILITY REPORT

SHIPPING AND RETURNS

SHIPPING


Check out the below estimates for shipping times where you are:


UK: Free standard delivery on all UK orders (1-2 days), Next day delivery available on orders placed before 1pm


Europe: Standard delivery 3-5 business days, Express delivery 1-2 business days


US & rest of world: Standard delivery 5-7 business days, Express delivery 3-5 business days


RETURNS


Money back guarantee: We offer a 60-day money back guarantee. Try your first pair of our period-proof undies and if they don't work as promised, we'll give you a full refund, no questions asked. 


UK returns: We gladly accept returns on any unused items in their original packaging within 30 days of ship date. 


International returns: We gladly accept returns on any unused items in their original packaging within 30 days of receipt date.


Exchanges: We gladly accept exchanges on any unused items in their original packaging within 60 days of receipt date. 


To arrange a return or exchange, please visit our returns centre here. 

Sustainably sourced

Fast + free UK shipping

Ethically manufactured

We give to girls 

in need

DETAILS

It really is in the name. Our Invisible Cheeky is ultra thin, super smooth, and truly invisible. Designed with our new soft, lightweight nylon fabric, they are super stretchy, comfortable and can be worn seamlessly under anything. No panty lines here!

Our breathable fabric keeps things nice and cool. With our signature absorbent gusset built-in, and absorbing up to 2 tampons' worth, you can wear them on your lighter days, for up to 8 hours. 

- Made from super smooth, breathable nylon fabric
- Lightweight, yet substantial 
- Seamless design
- Period and pee-proof, holding up to 15ml
- Quick-drying
- Buttery soft hand feel 
- Brushed matte finish

Dusty Rose is a deep, rich, shade of red. We think it's the perfect compliment to your period.

FIT AND SIZING

Funso is a UK 12 and wears a size M. Check out our size chart here.

SUSTAINABILITY REPORT

SHIPPING AND RETURNS

SHIPPING


Check out the below estimates for shipping times where you are:


UK: Free standard delivery on all UK orders (1-2 days), Next day delivery available on orders placed before 1pm


Europe: Standard delivery 3-5 business days, Express delivery 1-2 business days


US & rest of world: Standard delivery 5-7 business days, Express delivery 3-5 business days


RETURNS


Money back guarantee: We offer a 60-day money back guarantee. Try your first pair of our period-proof undies and if they don't work as promised, we'll give you a full refund, no questions asked. 


UK returns: We gladly accept returns on any unused items in their original packaging within 30 days of ship date. 


International returns: We gladly accept returns on any unused items in their original packaging within 30 days of receipt date.


Exchanges: We gladly accept exchanges on any unused items in their original packaging within 60 days of receipt date. 


To arrange a return or exchange, please visit our returns centre here. 

Style + fit

Made with lightweight breathable nylon fabric, our new Invisible collection is ultra thin and super smooth. 


No panty lines here, babe.

Fabric + care

Main Body: 92% Nylon 8% Lycra 

Gusset: 100% Cotton, Breathable PUL


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

Style + fit

Made with lightweight breathable nylon fabric, our new Invisible collection is ultra thin and super smooth. 


No panty lines here, babe.

Fabric + care

Main Body: 92% Nylon 8% Lycra 

Gusset: 100% Cotton, Breathable PUL


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

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  • 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 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.

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Hi-Waist - Light Absorbency

Hi-Waist

Lighter Absorbency

£24.95
Detachable - Light Absorbency

Detachable

Lighter Absorbency

£24.95£18.71