Sleep Short - Super Heavy Flow
Sleep short boxer style period underwear
Sleep Short - Super Heavy Flow
Sleep Short - Super Heavy Flow

Sleep Short - Super Heavy Flow

Regular price £32.95
/
Tax included. Shipping calculated at checkout.

These comfy Sleep Short style period undies are built with super absorbency to keep you protected all night long. With a protective layer offering extra coverage from front to back, you can rest assured you'll be protected from stained sheets and midnight leaks!

Our super-heavy Sleep Shorts hold up to 5 tampons worth (that's our most absorbent yet!)

  • Classic, comfortable cotton
  • Holds 5 tampons' worth or 25-30ml
  • Wear all night on super heavy flow
  • For periods, leaks & incontinence
  • Protection layer from front to back
  • OEKO-Tex certified materials

🍃 Bleed Green: Each pair of period pants replace 200+ disposables from going to landfill, reducing your waste by 99.5%

🤝 Giving Back: For every purchase, we give back to someone in need. Find out more about our #ByYouForThem giving back scheme here

We offer free shipping on all UK orders and free shipping on International orders over £75.
For same-day dispatch and next day delivery, please place your order before 1pm.
All orders are dispatched from our UK warehouse using trusted couriers such as Royal Mail, DHL and DPD. 

Christmas 2021 deliveries

UK

DPD Next Day Delivery Service 

Next day service, order by 12pm 23rd December, £6.95

Royal Mail 1st Class Delivery Service 

1-2 days, order by 12pm 22nd December, £4.95

FREE Standard Shipping Service 

2 days, order by 12pm 22nd December, FREE

 

Delivery options

UK

DPD Next Day Delivery Service 

Next day service, shipped by DPD tracked, £6.95

Royal Mail 1st Class Delivery Service 

1-2 days, shipped by Royal Mail tracked, £4.95

FREE Standard Shipping Service 

2-3 days, shipped by Royal Mail untracked

 

EU

*Free standard shipping is offered on all EU orders above £50 

Express Tracked Shipping Service 

1-2 days, tracked and signed, £14.95

Tracked Shipping Service

3-5 days, tracked, £9.95

Standard Shipping Service

3-5 days, untracked, £4.95 (or free on orders above £50)

 

USA & Canada

*Free standard shipping is offered on all International orders above £100

Express Tracked Shipping Service 

1-3 days, tracked and signed, £19.95

Tracked Shipping Service

5-7 days, tracked, £11.95

Standard Shipping Service

5-7 days, untracked, £8.95 (or free on orders above £100)

 

Rest of world

*Free standard shipping is offered on all International orders above £150

 Express Tracked Shipping Service 

1-4 days, tracked and signed, £19.95

Tracked Shipping Service

5-7 days, tracked, £14.95

Standard Shipping Service

5-7 days, untracked, £8.95 (or free on orders above £150)

Think our period pants sound too good to be true? Take them on a risk-free trial for 60 days!

If our undies don't work as promised, let us know within 60 days and we'll refund you, no questions asked. The 60-day risk free trial applies to one worn pair of undies only. Refunds will be paid to the original payment method that was used to place the order.
🚿 Rinse after use.
🧽 Machine wash on 30-40 degrees.
 🍃 Hang to dry or dry indoors on a radiator.
⚠️ Do not use fabric softener or bleach. No tumble drying.
And that's it! Your FLUX Undies are ready to wear again!

Our Period Pants Are:

Sustainably Manufactured

We only use eco-friendly materials that are sustainably manufactured

Vegan and Cruelty-Free

Made from natural materials and never with animal materials or testing

Free From Nasties

Certified safe for skin and free from toxins, chemicals and fragrances.

60-Day Money Back Guarantee
How They Work

Our period pants absorb up to 5 tampons' worth of liquid, yet they look and feel just like regular undies.

Our built-in tech works like this:

1. Top layer wicks moisture away from the surface quickly, to keep you dry

2. Our middle layers absorb your blood and lock in your flow

3. The bottom layer pushes liquid back up and keeps you leak-free

It's simple. Just wear, wash and reuse.

Blood, Sweat, Whatever.

Three layers of fabric absorbing liquid showing how period pants work

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Customer Reviews

Based on 49 reviews
94%
(46)
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V
VIRGINIJA PAREKH (Hemel Hempstead, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!
Calm sleep

I have a peaceful nights sleep when wearing these shorts because it garantees no leak

E
Elizabeth (Greenwich, GB)
Flow: Super Heavy, Heavy
Products used: FLUX Undies, obvs!, Tampons, Disposable pads, Cloth pads
Highly recommended

I wish I’d tried these sooner. I have very heavy periods and however careful I am I always end up with bloody sheets! Not any more. Period pants are the way forward. I’m using with tampons which I still change at night but don’t have to worry about leakage now, or adding more plasticky sanitary towels to landfill. Also much more comfortable. Give them a go! I might get more for daytime use too.

J
Judith (Oxford, GB)
Flow: Super Heavy, Heavy
Products used: FLUX Undies, obvs!, Disposable pads
Game changer

I love flux undies - in everyday life but also both at night and when exercising while on my period I have a lot less anxiety about 'leakage'.

N
Nicola W (Preston, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Cloth pads, Menstrual cup
These undies are a period game changer

Flux undies are easily one of the best investments I've made. No more leaks!! Even on stupid heavy days/nights. Very comfy. Just soak undies after use overnight in a covered bucket of water then pop in washer when done. They do take a couple of days to fully air dry but it's honestly not a problem. Wish they'd been available years ago. Totally game changing. I no longer dread my periods. Plus, no more I'll fitting disposable pads from me clogging up landfill!

P
Parveen (Chesham, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Tampons, Disposable pads
I love them

Flux are the best period pants I have tried. Robust and fit for purpose. I feel safe and secure wearing them.

P
Poppy (Bermondsey, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Tampons, Disposable pads
Flux undies

I am really happy with my purchase of flux undies. They're super comfortable and fit well. Helpful if you have a heavy period, no need to worry about leaks especially at night. Will be purchasing more in the future. Plus, a bonus is that they are a good eco alternative to other products. So a win win.