Teen Boxer

Heavy Absorbency

£20.00 GBP£20.00 GBP
Free UK shipping!

Teen Boxer Heavy Flow period pants look and feel like regular underwear but have the power to absorb your period and prevent leaks. This comfortable cotton underwear is quick-drying and super soft, bringing you next level comfort.

This snug fitting range prevents leaks when performing more active movement & sporting activities. The Teen range offers a carefree experience during that time of the month.

  • Holds 4 Tampons / 28ml
  • Wear For Up to 10 Hours 
  • Lightweight and Quick-drying

Machine wash max 40°C with mild detergent, hang to dry. No bleach. No tumble dry.

BODY: 95% Cotton, 5% Elastane
GUSSET LINING: 95% Cotton, 5% Elastane
GUSSET: 100% Microfibre, Biodegradable TPU

Our underwear has no added PFAS, and has been successfully tested for harmful substances and certified according to STANDARD 100 by OEKO-TEX®️.

We offer free shipping to all UK customers, regardless of order amount! Next day delivery is also available at checkout.

Orders placed before 12.30pm GMT will be dispatched the same working day. Working days are classed as Monday-Friday.

Ordering from somewhere else?

We offer free worldwide shipping on orders above £75 and express shipping options are available at checkout.


If you're unhappy with your purchase, we'll find a speedy solution for you. We offer returns and exchanges for 30 days, alongside our 60-day money back guarantee if our products don't work as promised (we're that confident!).

hands holding two boxes of teen period kit
cloud with blood drops above

How do fluxies work?

Fluxies teen period-proof undies absorb your flow and prevent any 'oops' moments — so you can feel fresh, leak-free and comfy. They look like regular undies, but work like magic!

Comfort, uncompromised.

Tried and tested by over 150,000 people

icon of a cloud

breathable and super-soft

icon showing washing machine with reusable diagram

reusable and washable

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natural odour-control

60 day risk-free trial
60 written in big letters

Teen Boxer Short

Get cosy and say goodbye to nighttime leaks!

Teen Period Kit

All three pairs in one multipack!

Try them risk-free!

Try Fluxies teen period undies for up to 60 days. If you don't love them, we'll give you your money back — hassle free!

What are people saying?

We let our reviews speak for themselves!

4.98 average
11,003 reviews

Teen boyshorts...brilliant!

So happy with these! My daughter loves them....no leaks, very comfy! Coming back for more.....


Period knickers

My daughter started her periods at 10 years old. She is autistic. And was no way near ready for it. But this underwear has been great and made her more confident.

Samantha Mcgill

Great first use!

They were so good to have to hand when my first period started


So amazing!

My daughter is autistic and these have taken so much stress away. No more discomfort, no more leaks and embarrassment, less washing for me!

Claire Hoskins

A must try

Transitioning to a life with periods comes with many adjustments but these pants have meant the transition is so much smoother. 

Mandakini Vadher


Bought these for my 14 year old daughter and she absolutely loved them. Don't think she'll ever use disposable sanitary products again.

Karen Bernstein 

Got questions?

Q) Can I wear Fluxies all day without other period products?

A) Yes! Fluxies period pants have three built-in layers that absorb your flow, control odour, and prevent any leaks! Find out more about how period pants work.

Q) How many pairs will I need?

A) We always recommend starting with our Teen Period Kit, which includes all three styles of period undies in one kit. But, you can start with as many as you like!