The Nappy Lady Ltd
Flux Undies Invisible Cheeks Period Underwear
Flux Undies Invisible Cheeks Period Underwear
Flux Undies Invisible Cheeks Period Underwear
Flux Undies Invisible Cheeks Period Underwear

Flux Undies Invisible Cheeks Period Underwear

£4.99  VAT Free
£21.95   Save 77%
Product Details


  • Light absorbency
  • Great for sports
  • Ultra thin
  • Up to 2 tampons worth
  • Wear up to 8 hours

Flux Undies Invisible Period Pants Overview

The Flux Undies are ultra thin, super smooth, and truly invisible, you won't get a VPL with these.  These are a game changer in period pant underwear.  Flux Undies Invisible Cheeky are cut the shape of bikini briefs and look just like normal VPL free pants.  Flux Undies Invisible Cheeky are soft, lightweight nylon fabric, they are super stretchy, comfortable and can be worn seamlessly under anything.   I wear these under my yoga or running leggings to help with any leaks (3 children later that pelvic floor isn't what it used to be!) As they are so thin there isn't a hard vpl in my "active wear", these are now my favourite work out pants.

As the pant is so slinky the gusset feels structured in comparison as it has the extra layers of absorbency in this area. This isn't necessarily a bad thing just if someone was sorting your laundry it feels a bit thicker in that area.  The pants come in a variety of colours but the gusset area inside remains black, this can make it appear a bit dark on some of the lighter coloured outers.

What I also really like about Flux Undies Invisible Cheeky is the lack of branding all over them! Now I maybe over sensitive but I'm not a fan of branding all over my period pants, I like discrete and don't want everyone to know i'm on my period while changing in the gym.  The Flux logo and washing details are printed on a light transfer inside the pants so nothing on the outside to identify them as anything other than pants.


The breathable fabric keeps things nice and cool. With their 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


Main Body 92% Nylon 8% Lycra 

Gusset: 100% Cotton, Breathable PUL


  • Quick rinse 
  • 40 degree wash 
  • Hang to dry
  • No bleach or fabric softener


Flux Undies
Flux Undies
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