Sleep Short - Super Heavy Flow

Regular price €31,95
/
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 tracked 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. 
 

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 £75 

Express Tracked Shipping Service 

1-2 days, tracked and signed, £14.95

Tracked Shipping Service under £75

3-5 days, tracked, £9.95

FREE Tracked Shipping Service under £75

3-5 days, tracked

 

USA & Canada

*Free standard shipping is offered on all International orders above £75

Express Tracked Shipping Service 

1-3 days, tracked and signed, £19.95

Tracked Shipping Service for orders under £75

5-7 days, tracked, £11.95

FREE Tracked Shipping Service for orders over £75

5-7 days, tracked

 

Rest of world

*Free standard shipping is offered on all International orders above £75

Express Tracked Shipping Service 

1-4 days, tracked and signed, £19.95

Tracked Shipping Service for orders under £75

5-7 days, tracked, £14.95

FREE Tracked Shipping Service for orders over £75

5-7 days, tracked

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.

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 63 reviews
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M
M S (New York, US)
Flow: Heavy
Products used: FLUX Undies, obvs!, Cloth pads, Menstrual cup
You need 3 pairs.

This pair is a must for everyone. Very comfortable, amazing protection. I’m getting 2 more pairs so I can have 3 altogether for my heavy nights. Love not having to worry about leaks. My flow is anywhere from super heavy to heavy.

I
Iosifina I. (Nicosia, CY)
Flow: Super Heavy
Products used: FLUX Undies, obvs!
Great product!

Amazing product. Especially for the heavy nights.

S
Stefanie Wai (Chelsea, GB)
Flow: Super Heavy, Light
Products used: FLUX Undies, obvs!, Cloth pads, Menstrual cup
Amazing!! Worry free sleep

I used to be really anxious before going to bed on the first heavy night of my period. I'd triple check my alarm for my 3am change and wake up panicky that the towel I'd laid down had slipped. I couldn't believe i these shorts didn't leak and I even found myself sleeping in more carefree positions rather than mummified and stiff lol. I think that the fact they are shorts and extend a bit down the leg stopped the main causes if leading fire me where my other branded pants either gaped or didn't extend far enough.. I think I'm brave enough to try sleep through the night without a halfway change... 🫣

R
Rox (London, GB)
Flow: Super Heavy, Heavy, Moderate
Products used: FLUX Undies, obvs!, Cloth pads
Amazing!!!

I have used reusable pads for years, but often had problems with leakage at night, which is why I have wanted to try underwear for a while, but always found it a little too expensive...I am so glad I finally bought some. Wish I had invested the money a long time ago, because I have never been more comfortable during my period. They fit so well and are so comfortable to wear, nothing leaks and they are good for hours. Really love them. I feel so much better during the night, but they are great during the day and for sports too.

C
Caro (Saint-Laurent, CA)
Flow: Super Heavy
Products used: FLUX Undies, obvs!
My mom loves them

I gifted my mom several pairs of extra absorbing sleep shorts for extra protection during small episodes of leaky bladder and she loves them! They’re so comfy she wears them every day.

S
Sunny (London, GB)
Flow: Super Heavy, Heavy
Products used: FLUX Undies, obvs!, Tampons, Disposable pads
Fantastic

Great peace of mind through the night. Comfortable, although slightly tight when bloated! Easy to rinse out and wash. Highly recommend.