Flux Undies Boyshort Period PantsFlux Undies Boyshort Period PantsFlux Undies Boyshort Period Pants
Flux Undies Boyshort Period Pants

Flux Undies Boyshort Period Pants

  (1 Review)

Flux Undies Boy Short Period Pants are great for periods, leaks and incontinence. When I first read the name "boy short" I expected something like tight shorts however this IS NOT what they are like at all. Flux Undies Boy Briefs are really a "midi" style pant or how I described them as your "comfy knickers." They cover your bum, have fairly deep sides but with the modern Flux waist band they look fashionable and not big granny pants!

Flux Undies have the most deliciously soft tencel modal fabric. There is nothing rough or crunchy about these. Modal fabric is often found in ladies tshirt style tops to help you visualise the type of fabric is it.  The fabric is designed for comfort and to be gentle on the skin.  Tencel originates from renewable raw materials that are certified compostable and biodegradable.

Flux Undies BoyShort offer the main absorbency in the gusset of the knickers. This is great if you don't want absorbency right up to the top as some other brands do.  Concentrating the absorbency just in the gusset makes the light absorbency option feel like normal knickers.  Anyone in my home could do the washing and not know these were anything other than a normal pair of Mummy's black pants!   The heavy days option the gusset area does feel more "structured" and thicker. There is more of an outline marking the changing in thickness of the fabric from the gusset to the main body of the pants.  In both absorbency options the rest of the pant is made with a double layer of modal fabric in the main body of the pant making them feel like a good quality pair of pants and no extra "padding" to feel in these areas.

The gusset gives a breathable leak proof layer and prevents any leaks. The built in moisture wicking top and absorbent layers keep you feeling fresh and dry up for up to 6 hours.

Flux Undies BoyShort come in two absorbency options and can be worn day and night.


  • Wear for up to 12 hours on heavier days
  • Holds four tampons' worth or 20ml


  • Wear for up to 6 hours on lighter days
  • Holds two tampons' worth or 20ml

Flux Undies have:
No Synthetic Fragrances,
Paraban Free
Naturally Anti-Bacterial
Sustainably Sourced
Cruelty Free
Reusable & Washable

They can be worn day and night and are made from OEKO-Tex certified material.


Fabric + care

Inner: 95% Modal 5% Elastane,

Waistband: 100% Polyester, 

Gusset: Absorbent blend, Breathable PUL


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



Brand:  Flux Undies
Absorbency:  Night / Heavy
Ease of Use:  Simple

Flux Undies
Average Rating (1 Review):  
Write a Review and share your opinions!

Amazingly Absorbent for heavy days
Thursday, 24 June 2021  | 

This is the 2nd brand of period pants I've tried - although slightly more expensive the heavy flow version does what it promises: I got through the whole of my heaviest day without needing to change. They are also super comfy and less crunchy than the others i have. Do check the size guide on the Flux website, as i had to order a MUCH bigger size than i would normally, but they size they recommended fit perfectly.

Was this helpful to you?  Yes  /  No

This review has not been appraised.

free delivery over £50 See our delivery page for full info
nappy advice questionnaire See what The Nappy Lady recommends
friendly customer support 01252 372266 - weekdays 9.30am - 2pm
The Nappy Lady Logo