Leakproof Brief

$62.95

Taxes included.

Double Undies® have you covered for leaks, periods, sweat (and even camel toe).

Designed for high-impact workouts, this absorbent performance brief features a smooth, seam-free finish and a comfortable mid-waist fit that sits neatly under tight clothing. We’ve retained our signature patented gusset for trusted protection, while refining the back rise for a more subtle look.

Double layer absorbency for reliable protection when you need it most
Silicone grip dots keep the brief securely in place, no riding up or shifting
Moisture-wicking layer + antibacterial technology to lock in odours and keep you feeling fresh
Dri-Flex™ fabric delivers stretch, breathability, and support without compromising performance

Washable and reusable, each pair also comes with a discreet waterproof bag, designed for life on the go.

$7 Delivered NZ – $10 Delivered AU

FREE NZ & AU delivery with orders over $150

Afterpay installments available but currency converts to NZD

Selected Size: XS

XS S M L XL XXL

Selected Pack Size: Single $62.95 Single $62.95 3-Pack $178.95 (SAVE $9.90)

Selected Color: Black

SAME DAY DISPATCH on orders made by 2pm NZST

Leakproof Brief

$62.95

XS Single $62.95 Black

Game changer for workouts!

I bought these undies because I'm sick of wearing bulky period undies under my gym leggings to catch leaks. I love how they offer the same absorbency, without feeling like I'm wearing a nappy! They also dry so much faster. I can't recommend them enough!!!

SO WORTH IT

I have both the leakproof brief and a thong, and they’re both great! I do powerlifting and experience leakage in heavy lifts, and these keep me dry and confident (am no longer worried about any leaks). The black is not visible with my blue bike shorts and no panty lines visible either. They’re comfy, and they work brilliantly. Love ‘em!! Thank you 🙏🏻 🫶🏻

Game changer. I will be buying more!!

I thought I'd wait after a few uses before posting a review. I am so happy with these this undies!! They keep me dry throughout workouts. I've tested them in a variety of cardio and weight sessions. I never get that damp feeling like I have done with some underwear brands. There is no Camel toe nor is there movement. They stay in one place!

Im an in-between size so on reading reviews went with the larger of the two sizings and they fit like a dream. Thank you for creating a brand of underwear that builds confidence that no accidents in the ring or in the gym will occur. I'm forever grateful.

Thank you so much for taking the time to share your experience!

I especially appreciate that you put them through their paces before leaving a review. It's fantastic to hear they've kept you comfortable through a variety of workouts and that you've found them to stay in place without movement, camel toe, or that damp feeling.

I'm also glad sizing up worked well for you. For anyone sitting between sizes, that's often the best option, so it's really helpful feedback for others considering which size to choose.

Most of all, hearing that Double Undies has helped you feel more confident in the ring and in the gym means the world to us. That's exactly why we created them.

Thank you for your support, and we're so happy to have you as part of the Double Undies community.

Game changer!

Wow, thanks so much for a marvelous invention, I am running long distances with peace of mind now, thank you, thank you!

Thank you so much!

Reading reviews like this makes all the hard work worthwhile. Knowing you're out there running long distances with confidence and peace of mind is exactly why Double Undies exists.

Happy running, and thank you for your support

Way better than I expected

Don’t know why I put up with period undies for so long, these are more comfortable, less bulky, look great under tights and do the job.

Thank you so much for your review!

I love hearing this. It's always nice when something exceeds expectations, especially when it's replacing something you've just put up with for years.

I'm so pleased you're finding them comfortable and less bulky, while still doing exactly what you need them to do.

Thanks again for taking the time to share your experience

Best sweat proof undies!

These briefs make me feel so much more confident, comfortable, and less self conscious at the gym! I previously have had huge sweat marks around my front and these briefs make a massive difference. They've helped me immensely, will definitely be buying a few more pairs. They're so worth the purchase. They're also super comfortable and invisible under gym tights. No more trying to wrap a jersey around my waist to hide the sweat!

No more panty shields!

I joined a gym in late 2025. Love it. But I don't love using panty shields to protect me from the sweat! This is far better for the environment. Savinf me money. So comfy. Thanks!

They actually work!

Double undies you are fantastic!

The best

A real game changer. I love the briefs, have worn them for netball and running and no leaks. They are super comfy. Great design. Highly recommend.

That's awesome to hear Tess! Glad you find them comfy and they protect you against leaks when playing netball and running! Appreciate the review.

Great design

Great design and yes, it is true, they are invisible under tights! WIll be back for more!!

Hey Melx, thanks so much for your review, glad you like them!

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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