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. 
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 42 reviews
Flow: Super Heavy
Products used: FLUX Undies, obvs!
Nicely fitted without bulk

Having ordered previously I just knew that I would be happy with this purchase. I have tested this pair and say I most pleased with the fabric,ease of washing,cost and the fit. These are highly absorbent with none of the bulk associated with wearing a super thick sanitary pad. I no longer have to worry about a leak in bed or ruining any new bedding.

36 (Nottingham, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!
Comfortable eco choice

Good quality eco alternative to single use sanitary products. They’re comfortable and easy to wash, although they do take quite a while to dry so I’d recommend buying enough pairs to last your whole period if you can afford it… they’re are quite pricey, but I’m seeing them as an investment that allows me to take positive action.

Size-wise, I’m a pear shaped size 12 but bought size large (14) for a comfortable fit. Glad I did, I think size M (12) would be too small.

Alessandra Marguerat (Lausanne, CH)
Flow: Heavy
Products used: FLUX Undies, obvs!, Tampons, Cloth pads

I used to wear two extra large pads at night, sometimes having to get up in the middle of the night to make sure there was no leak. I used to spend super uncomfortable periods, trying to stay perfectly still for the entire night otherwise I'd have to change my sheets every morning. I've been using the sleep shorts for two months now and it honestly changed my life during my periods. I can sleep through the night and I am not worried about leakage anymore. It's comfy and perfect!

Anonymous (Harrow, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Disposable pads
Fantastic pants!

I literally can’t stop raving about them. They have made having your period so much more comfortable (& are especially good after you have had a baby & are looking for other period product options)

Anonymous (Wanstead, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Menstrual cup
These are good

No more waking up in a pool of my own blood. It's less goth but also less laundry.

EmmaJ (Nottingham, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Menstrual cup
So comfortable!

Really comfortable and no leakage.