Leakproof Thong
Leakproof Thong
Leakproof Thong
Leakproof Thong
Leakproof Thong

Leakproof Thong

Regular price $59.95
Taxes included.

The original Double Undies®

A moisture-wicking layer keeps you feeling fresh, while the strategically placed padding on the coccyx adds comfort and helps absorb sweat right where you need it. Made with our Dri-flex™ fabric, they stretch to fit a wide range of body shapes and sizes without compromising support.

Oh—and they’re washable and reusable, making them as good for the planet as for your confidence. Each pair comes with a waterproof bag for life on the go because your gear should work as hard as you do.

Selected Size: S

Sizing Chart

Selected Pack Size: Single $59.95
Selected Colour: Black
Free NZ delivery over $150

Customer Reviews

Based on 13 reviews
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S
Shantelle
Saved my dignity 💫

I now feel protected lifting heavy and can wear any color! Leakage is part of every day life for women thank you for creating this product!!!! 🫶🏻🫶🏻

A
A.K
Best Period Thongs Out!

I don't have any issues with leakage, but I’ve been on the hunt for good period undies for some time. I’ve tried several different brands and found them to either be uncomfortable, not absorbent enough on heavy days, or give me serious panty lines through my workout tights.

When I saw that Double Undies provide coverage like an overnight pad, I had to try them. I bought the 3-pack and it ABSOLUTELY blew my mind! I wore them for the first time last week and I had to send Jane a message about how I impressed I was with them. I wore them for day 2 of my period (heaviest day usually) and got a deadlift PBand I'd completely forgot I even had my period! I just felt dry. And not only that, it absorbed my sweat too, so I’d say you could wear light-coloured tights without worrying about a sweaty crotch patch!

I’m truly impressed by these and will be getting more for sure. They've seriously changed the game for me — not just in the gym, but in day-to-day life during my period.

A
Ange
Security

I got a pair of double undies just to try...I am a mum of 6 so have some leakage....I have spent a lot of money to try and find comfortable effective underwear.....Double Undies are by far the best yet, soo comfortable...in fact you don't really know you are wearing them....I will definetly save up and get more 🥰

H
Henn
I can do anything again

This product is a game changer.
I can skip, handstand walk, squat and run again without being fearful of leakage.
I use to wear period things for the gym but found them to be bulky and much prefer “Double undies” because of the seamless edging which means no one knows I’m wearing any extra coverage! AMAZING!!

After one pair, you’ll wanna snatch up a few extras! Trust me, always handy to have in my gym bag

D
Dael
Double the security!

Love my Double Undies!! Give me just the little bit more assurance when exercising especially when I'm the one standing in front of the group fitness class showing them what to do. It also absorbs sweat so the wet patches aren't the focus of my teaching. Great for all types of sports & any exertion. 'Go the DUs'

L
Liv
Cannot rate Double Undies enough!

Absolutely LOVE this product. I can now give my workouts 100% regardless of the exercise with no fear or embarrassment. Super comfortable and I’ve washed a few times now and they still keep shape. Thank you so much for creating a while thought out product that will help so many!!

I
Isabelle
100% double protected

Love my new double undies. Protecting me through all things sweaty and more during my WOD's. The anxious feeling has gone and I feel great about carrying out my workout. Also the feel and fit is perfect!

B
Becca

After discovering I had a prolapse, I was honestly so nervous to return to the gym. Exercise plays such a huge role in my mental wellbeing, and the thought of stopping felt overwhelming. But the Double Undies Thong has been a total game changer! It's incredibly comfortable, discreet, and gives me the support I need to move with confidence. I'm now able to rebuild my strength postpartum without the added stress or fear. So grateful to have found something that empowers me to keep doing what I love.

F
Freya
I can just get on with it!!

Designed by a woman, for women! I hounded Jane when I heard she was bringing this thing to market. Skipping, jumping on the trampoline with the kids, long runs, high impact exercise… all things I’ve loved but would have to avoid, alter, hold back or stop prematurely because my pelvic floor just wasn’t strong enough that day…🥺 and it could be as simple as where I was in my cycle. I’d pee several times before a workout and STILL not be safe. Finally!! I don’t have to hold back! I mean, I might still pee a little and my pelvic floor may not be supporting me as it should, but I don’t care because Double Undies will. I can just get on with it! I’m actually able to string together double unders now and I am so bloody excited about it! Wish I’d had these years ago 🤩

R
Roslind
Double undies are awesome

So happy with my double undies!!
1. No crotch sweat!
2. Sturdy and not riding up my lady parts!
3. No evidence of leaks
I can confidently wear light tights to workout in

FAQs

Why Double Undies?

Our undies are built differently. Designed for active women, Double Undies feature a patented “winged” leak-proof design with a double-layer absorbency system that holds over 30ml (that’s more than 6 tampons), giving you peace of mind through workouts, long days, or surprise leaks.

Do they feel bulky?

No. They’re designed to feel smooth and lightweight while providing targeted support.

What if I’m between sizes?

These undies are super stretchy, so we’d recommend sizing down if you’re between sizes.

Are they seen under workout leggings?

No. They’re made with smooth, laser-cut edges to stay invisible under tight workout gear.

Can I wear these for everyday use?

Absolutely! They’re designed to be comfortable enough for all-day wear, working out, or not. Feel confident in & out of the gym.

How much do they absorb?

Over 30ml. Equivalent to 6 Tampons.

Designed to help manage light bladder leaks during everyday activity. Individual results may vary.

What materials are used in Double Undies?
  • Main: 84% Nylon / 16% Elastane
  • Inner Gusset: 100% Cotton
  • Absorption Lining: 80% Polyester / 20% Cotton
  • Leak Proof Lining: 100% Polyester
How do I wash & care for my Double Undies?

Wash before wear

Cold gentle machine wash

Do not use fabric conditioner

Do not bleach

Do not iron

Do not dry-clean

What is the bag for?

Our bag is made from 100% recycled plastic bottles — because looking good and being kind to the planet can go hand in hand. But it’s not just for looks — it’s designed to be practical too. After your workout, you can pop your Double Undies into this waterproof bag and head out without worrying about leaks or odours.

And if you want to keep things discreet? Just peel off the sticker — no one will know it's an absorbent undie.

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