Classic Bikini - Heavy Flow
Bikini style lace period pants
Bikini style lace period pants
Bikini style lace period pants
Classic Bikini - Heavy Flow
Classic Bikini - Heavy Flow
Classic Bikini - Heavy Flow

Classic Bikini - Heavy Flow

Regular price £27.95
Tax included. Shipping calculated at checkout.

Our Classic best-selling Bikini period underwear combines style with function. Holding up to four tampons' worth, they are a dream to wear day and night and can be worn leak-free for up to 12 hours. 

  • 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 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 166 reviews
N.Y (Belfast, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!
Life changing!

Classic Bikini Heavy Flow do an amazing job! Love to wear them,Life changing!

Lucy (Greenwich, GB)
Flow: Moderate
Products used: FLUX Undies, obvs!, Menstrual cup

Comfortable fit, great sizing, love the lace design, look very similar to regular pants. Perfect as a backup for a cup.

Sandy (Wolverhampton, GB)
Flow: Heavy, Moderate
Products used: Tampons
Happy with the product

I will definitely buy a few more of these.
Comfortable to wear. I get irritated by seams on underwear but these felt really soft. No irritation.

Luisa Martin (Norwich, GB)
Flow: Moderate
Products used: FLUX Undies, obvs!, Menstrual cup

Don't even know I'm wearing them, as they feel like normal knickers.

Adriana Navarrete (Amersham, GB)
Flow: Super Heavy
Products used: FLUX Undies, obvs!, Tampons, Menstrual cup
Super comfy

These undies do an amazing job! Love to wear them, although they are a bit bulky. Life changing!

Isabella I. (Cardiff, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!, Cloth pads
Comfy and so practical

The size I got fit me so well, they were great to wear overnight and super comfy.