Classic Boyshort - Heavy Flow
Classic Boyshort - Heavy Flow
Classic Boyshort - Heavy Flow
Classic Boyshort - Heavy Flow
Classic Boyshort - Heavy Flow
Classic Boyshort - Heavy Flow

Classic Boyshort - Heavy Flow

Regular price £27.95
/
Shipping calculated at checkout.

Get comfy on your period with our leak-proof Boyshort period pants, featuring our classic logo elastic waistband full of stretch and softness. With our signature built-in tech that is moisture wicking, absorbent, and leak-proof, Boyshort gives you the ultimate comfort and protection during your period, day and night.  

  • For periods, leaks and incontinence
  • Holds Four Tampons' Worth / 20-25ml
  • Wear For Up To 12 Hours Leak-Free
  • Soft, Stretchy and Comfortable
  • Lightweight and Quick-drying
  • OEKO-Tex Certified Materials
  • Free From Toxins, Chemicals and PFAS/PFOA

Materials: Body95% TENCEL Modal 5% Elastane Gusset: Absorbent Blend, Breathable PUL Packaging: 100% Recycled and Recyclable Cardboard

🍃 Bleed Green: Each pair of our 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 183 reviews
89%
(162)
9%
(16)
3%
(5)
0%
(0)
0%
(0)
I
Isla Ferguson (Blandford Forum, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!
Made all the difference

Has taken the worry and awkwardness out of periods.

L
Lisa Gorski (Etobicoke, CA)
Flow: Heavy
Products used: FLUX Undies, obvs!
Changed my life

Honestly I’m just mad I didn’t get these sooner. So comfortable, so secure and so much better for the environment. Thank you Flux

F
F Nicholson (Craigavon, GB)
Flow: Heavy, Moderate
Products used: FLUX Undies, obvs!, Cloth pads, Menstrual cup
Love these!

I started using my first pair of flux undies a couple of years ago and I love them so much so I decided it was time to order a few more pairs! I use a cup for the heaviest couple of days of my flow and like to wear flux alongside as backup. I then continue to wear them on their own for the lighter days, they’re also amazing for sleeping and I feel way less worries about leaking than I did with pads! I love that you can choose different styles for different flows and aside from being great period pants, they’re just great pants! Sometimes I wear them when I’m not on my period just because they’re so comfy! Couldn’t recommend more, and I have zero need for “disposable” products any longer!

A
Anonymous (Folkestone, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!
Game changer

15yr daughter goes to school with no worries, wish these were around when I was her age! Worth every penny!

K
Katie Reid
Flow: Heavy
Products used: FLUX Undies, obvs!
Game changer

Absolutely would not use anything else now,super comfy,do not smell,feels just like I'm wearing normal panties

S
Sewell (Barnsley, GB)
Flow: Moderate
Products used: FLUX Undies, obvs!, Menstrual cup
Absolutely love them!

I previously bought the thong pants from flux, and they were good for daytime and lighter days. But the boyshorts have surpassed my previous expectations. Incredibly comfortable and absorbable. Highly recommend them!