Light absorbency

holds 2 tampons' worth

Need something for your lighter days? 

Say hello to our new Boyshort in a light absorbency - great for light flows, pesky leaks, and those 'oops' moments.

Boyshort is made using soft, luxurious, and eco-friendly modal elastane fabric and features our classic soft and stretchy logo waistband.

With a super thin gusset, they feel like normal underwear but keep you fresh and dry all day on your lighter days.

  • Wear for up to 8 hours on light days
  • Holds 10-15ml, or two tampons' worth
  • For periods, leaks & incontinence 
  • Great for day and night.
  • Sustainable and OEKO-Tex certified fabrics

FLUX Boyshort - Light
FLUX Boyshort - LightFLUX Boyshort - Light

Absorbency guide  

Light = 2 regular tampons' worth 

Full = 4 regular tampons' worth


Outer and Inner: 95% Modal 5% Elastane, Trim: 100% Polyester, Gusset: Absorbent blend, Breathable PUL



Give 'em a quick rinse 🚿


Chuck 'em in the machine on a 30-40 degree wash with the rest of your laundry 👌🏽


Hang to dry outside, inside, or on a radiator! ✌🏿

PS: Don't use bleach or fabric softener ⚠️


Customer Reviews

Based on 8 reviews
Flow: Light
Products used: FLUX Undies, obvs!, Cloth pads, Menstrual cup

Thought I’d try the light boy shorts for those days where I might have used a liner and they are absolutely perfect. Great fit, nice look, absorbent, no fuss, no waste... can wear these all day and forget that I’m not just wearing “normal” underwear. Ordered one pair to start but have just ordered 4 more :) For me, these are working out better than the washable sanitary pads and liners - no moving around, more absorbent - you forget you’re wearing them.

Flow: Moderate
Products used: FLUX Undies, obvs!, Menstrual cup
Comfy and reliable

I bought these as a back for possible cup leaks and use at the end of my period. They are very soft and comfortable. They are a snug fit and therefore preventing any leaks.
Fit is true to size. I am a size 8 and these fit perfectly.

Flow: Heavy
Products used: FLUX Undies, obvs!, Disposable pads, Cloth pads

I love these! Definitely not going back, so comfy and functional!

Flow: Heavy
Products used: FLUX Undies, obvs!
I wish I'd discovered these years ago. Life changers.

I have spent the last two decades with very unpredictable very heavy periods.
I tried many methods of dealing with this situation, reusable cups, disposable cups, tampons with pads, even medication and hormone therapy.

Nothing was ideal for various reasons and I ended up becoming something of a recluse as I was nervous about going out and about.
I purchased a pair for heavy days and a lighter pair to wear for 'just in case' days. I have been very impressed.
It feels like I have the chance to get my life back - although the long term damage of decades of anxiety and fear will take a while to unlearn.

I had a few problems with the heavier pair taking ages to dry but the Flux team were incredibly helpful in sorting that out. Seems hand washing in my case won't work because they do need to be spun dry to get as much water out of them before hanging them on the line.
The lighter pair dry much faster than the heavy pair.

Great value, very comfortable and strange to be able to go out without constantly worrying about leaks or a random period starting.

Flow: Heavy
Products used: FLUX Undies, obvs!
Great value, important purchase

I already own the "heavy" day versions of this particular pair and I have to say it's a great alternative, especially towards the end of my period. Also a great value and good for the environment. Doing the math, I've realised that buying my 5 pairs of underwear has actually already saved me money from the pads and tampons I buy per year so thank you Flux!


blood. sweat. whatever.

our unique undies hold up to 4 pads/tampons' worth keeping you covered day and night, heavy or light.

and they're washable & reusable so you save money whilst savin' the planet. it's a win win

What do real people think of our undies?

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