Leakproof Thong
Leakproof Thong
Leakproof Thong
Leakproof Thong
Leakproof Thong
Leakproof Thong

Leakproof Thong

Regular price $59.95
Taxes included.

Double Undies® have you covered for leaks, periods & sweat.

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.

$7 Delivered, NZ
$10 Delivered, AU
FREE NZ & AU delivery with orders over $150
New undies colourway & extra sizes landing soon
Selected Size: S

Sizing Chart

Selected Pack Size: Single $59.95 NZD
Selected Colour: Black

Customer Reviews

Based on 68 reviews
90%
(61)
6%
(4)
1%
(1)
1%
(1)
1%
(1)
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!!!! 🫶🏻🫶🏻

T
Tina
Game changer

Comfortable to wear and give you confidence to jump and skip without fear of leakage…. will be ordering again now I have tested them out and they work as described ☺️

R
Renee
Confidence booster!!

I’ve been struggling to lift heavy weights in fear of leakage, honestly wasn’t sure these would work for me but they’re an absolute game changer!! Gave me the confidence to lift heavy weights without the fear of leakage. Highly recommend to other women who let the fear of leakage hold them back!!

A
Anon
Double Undie Review (thong)

Happy with this product. I was sceptical at first but I was impressed with how well they worked. I had to visit a friend after tennis and could not change beforehand and was worried about leakage and smell, but neither were an issue. The large were a little snug but will purchase and XL. I am usually a size 14-16 undies. Thanks

T
Teal
So worth it!

I’ve been tossing up buying double undies for months and finally took the leap and can confirm they are an absolute game changer. They are so comfortable to wear, I feel so confident at the gym especially when lifting weights. I’m just disappointed I didn’t get a 3 pack as now I’m washing one pair daily to wear every time at the gym!

J
Jenny
So comfy!

Just wot I needed for my workouts at F45! No more leaks on my tights, perfect.

S
Sarah
Comfy and secure

Thort they might feel bulky. But not and so great to be a G so no lines in workout tights

R
Rachel
Game Changer!!

As a mum of 3 I struggle with bladder incontinence sometimes during high intensity CrossFit workouts. I came across Double Undies on Instagram and thought I’d reach out to see if they would be any use to me. They were so helpful and prompt to reply that I ordered a pair and within a couple days they were in NZ. I tried them during my wod that had butterfly pull ups and double unders, and miracle! No wet tights and I was able to continue my workout knowing any leakage was contained. Definitely recommend, I’m going back to order more pairs as we speak!

V
Vicky
Wish I purchased them sooner!

As a powerlifter I'd been struggling with leaks on those top sets. I'd hesitated in purchasing these as they are quite pricey and thongs aren't normally my go to. After having no success with afew other brands I took the plunge. My only regret is not buying them sooner! Super comfortable and do exactly what they're made to do. Fabulous product!

B
Bec

The perfect just in case undies! The first time I wore them there was skipping in my gym class and at that moment I knew they were perfect! Definitely will be ordering more and singing their praises to friends. They are much less bulky than any period indies I’ve owned before, very comfortable 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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