Seamless Thong
Seamless Thong
Seamless Thong

Seamless Thong

Regular price £16.95
/
Shipping calculated at checkout.

These seamless period thongs are ultra-thin, super smooth and truly invisible. Bye-bye pantyliners! Designed with soft, lightweight nylon, they are super stretchy, comfortable and can be worn seamlessly under anything.

The breathable fabric keeps things nice and cool, and of course, our signature built-in tech absorbs moisture and prevents leaks, holding up to 1 pantyliners' worth of blood for up to 8 hours, keeping you oh-so-fresh. 🌸

  • For Periods, Leaks and Incontinence
  • Holds 1 pantiliners Worth / 5ml
  • Wear For Up To 8 Hours Leak-Free
  • Soft, Stretchy and Comfortable
  • Lightweight and Quick-drying
  • OEKO-Tex Certified Materials
  • Free From Toxins, Chemicals and PFAS/PFOA

Materials: Body95% Nylon 5% Elastane Gusset: 100% Cotton, 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 12 reviews
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(11)
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C
Chloe Mcdermott (Bracknell, GB)
Flow: Moderate, Light
Products used: FLUX Undies, obvs!, Tampons, Disposable pads
Just what I was looking for!

These are so good, I hate wearing normal pants because of the VPL so these are a great alternative to normal period pants.

M
Marina A. (Nicosia, CY)
Flow: Moderate
Products used: FLUX Undies, obvs!, Disposable pads
Love them!

They work great for lighter flow days, I actually wear them on non-period days as well!!

E
Eve Mcnaghten (York, GB)
Flow: Moderate
Products used: FLUX Undies, obvs!
The best period undies I’ve ever used!

Flux undies have the best period products I’ve ever used. These undies are so comfortable and discrete, il never use another brand.

V
Victoria (Hackney, GB)
Flow: Light
Products used: FLUX Undies, obvs!, Menstrual cup
Great but runs a little small

I love my Flux, they make me feel super comfy and safe when I’m on my period, however I found this style runs quite small and is a bit tight on my hips and tummy (especially with the period bloat..) so I’d recommend going a size up.

M
Macey Naylor (Mitcham, GB)
Flow: Heavy
Products used: FLUX Undies, obvs!, Tampons
Great

I unfortunately realised I was going to be on my period at prom and so I bought this in replacement of a panty liner that I always wear when I have a tampon in, it was great and I felt secure all night and didn’t have to worry about leaking through my tampon or having a visible knicker line

L
Little Mouse73 (Newtownabbey, GB)
Flow: Light
Products used: FLUX Undies, obvs!
Little Mouse73

I bought these thongs to wear with my sport gear and jeggings. The are so so comfortable.