Leakproof Thong
Double Undies® have you covered for bladder leaks, periods and sweat.
Designed for women who move, our absorbent performance thong combines comfort, confidence and protection, whether you're lifting weights, running, chasing the kids or simply getting on with your day.
Featuring our unique winged gusset with two layers of absorbency, it provides extra coverage where you need it most, without compromising on your favourite underwear style. With a smooth, seam-free finish, it's designed to move with you, whatever your day brings.
Smooth, seam-free finish for a discreet look
- Winged gusset with two absorbent layers for bladder leaks and periods
- Moisture-wicking fabric to keep you dry and fresh
- Smooth, seam-free finish for a discreet look
- Dri-Flex™ fabric for stretch, breathability and performance support
Washable and reusable, each pair also comes with a discreet waterproof bag, designed for life on the go.
Leakproof Thong
I’m early into my powerlifting journey and preparing for what will likely come as I progress with heavy deads! Wearing these for the first time this week though, what I love about them is they do not move!!! No rolling downwards, no readjusting. They just stay put. Amazing! I’ll be wearing nothing else in future.
I wore them for my powerlifting competition over the weekend and they gave me that extra confidence I needed when stepping onto the platform. Comfortable, supportive and stayed exactly where they needed to — no distractions, just focus on the lifts! 💪🏼🔥
Feeling strong, confident and competition-ready. Highly recommend Double Undies! 🏋🏼♀️✨
Oh my gosh, this is amazing! Thanks so much for your review and I'm so glad they gave you that extra confidence! That's what it's all about ❤️ And well done on your competition!
From my very first interaction, I felt like I was supporting a real person and a grassroots business rather than just another online store. The customer service is genuinely second to none.
The G-string itself is surprisingly comfortable. It’s completely invisible under tights and, best of all, gives me so much confidence during workouts. I’m no longer worrying about leaks or rushing to the bathroom before every session—I can just focus on training.
For sizing, I initially ordered a medium because that’s what I wear in tights, but I found the small fit me much better and was even more comfortable. When I contacted the team to exchange the two unworn pairs from my 3-pack, they went above and beyond and organised FedEx shipping so I had them in time for my competition. That level of service is rare.
Standard postage is a little slower, but with customer service like this, it’s a trade-off I’m more than happy to make.
I’m already planning to order the beige pair next… and maybe even branch out into lighter-coloured tights now too!
I have started running and these are a fantastic purchase. I feel confident, they fit great, totally worth it, highly recommend. I bought M, I am a 12. Thanks for producing such a well made well designed product. I will purchase further pairs 😊
Has been perfect and helped me get my confidence back after the gym.
After 4 children and multiple surgeries, but still wanting to do intense workouts and lift heavy, these have been a life saver for those ‘oh no’ moments.
Super comfy and not bulky at all! No more embarrassing sweat leakage, worn them last weekend for hyrox and they actually worked!
The pair received have a sharp lump on the seam, right by where her fingertip is in the photo. This pushes into a delicate area that she’d rather it didn’t when wearing them. Since trying them on for the first time, they now sit in their bag on our kitchen island while she makes her mind up about whether to repair or return them.
If there is an issue with the stitching or if the product is faulty, please let us know so we can replace the item and investigate the problem.
There shouldn’t be anywhere on the undies that causes discomfort. You’re more than welcome to send them back for a replacement. Please bear in mind that the undies should be washed before wearing, as this may even resolve the issue.
Totally in love with my black pairs of Double Undies. The extra coverage in the nether regions allows me to use the bikes and rowers at my gym and not be worried about sweat marks left on the seats as there is simply none!
I cannot recommend these undies enough! Perfect protection from embarrassing exertion leaks and crotch sweating when exercising. I didn’t even realise how much anxiety I was carrying until these brilliant undies saved the day. I absolutely love them. Comfortable, totally seam free, and 100% reliable. Brilliant, brilliant product. I will be buying many more pairs.
Kia ora! I’ve always worried about leaks during workouts and used to wear pads all the time. Since getting my Double Undies 3-pack, I finally feel confident and comfortable🙌🏽 These undies really do what they say. I’m obsessed! Thank you☺️
Highly IMPRESSED with the quality and it is highly absorbent! I am obsessed with this product. Available in larger sizes and size true to size chart. The best on the market. - thanks Double undies team -
Highly IMPRESSED with the quality and it is highly absorbent! I am obsessed with this product! Available in larger sizes and fits true to size description! The best on the market!!! Thanks team double undies.
Not only is the fabric stretch and forgiving, it also stays put and gives ample coverage for my lady bits. The cut is perfect and accommodating for my booty/hips. I cannot express just how much I am in love with these undies! I need one in every color!
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!
Love them, felt more confident squatting and deadlifting with them on. No more pad liners!!!
Running long distances have never been such a breeze! IYKYK that sometimes on the downhills you get a-bit of leakage and these absolutely saved the day on race day. Helping this Māmā complete an ultra trail race without a worry in the world. Cheers double undies 🤙🏼
If you don’t already own a pair, you are missing out! Comfortable and seamless, I wear mine everyday! Totally obsessed!
Crossfit mum of two here. Yes, I've done my pelvic floor work (and continue to do so) but sometimes we just want to WOD without the worry of leakage! I wasn't 100% sure it would work, but I've tried the undies running, jumping and skipping... all with zero leaks. Definitely the undies I'll grab on doubleunder day :)
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 🤩
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!!!! 🫶🏻🫶🏻
Size is smaller than standard underwear. Order 1 x size up
Reached out to double undies regarding sizing before making a purchase and they replied instantly! So didn’t hesitate and clicked buy now! Now training for my half marathon I can wear whatever I like and not have to worry about any leakage!
FAQs
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.
No. They’re designed to feel smooth and lightweight while providing targeted support.
These undies are super stretchy, so we’d recommend sizing down if you’re between sizes.
No. They’re made with smooth, laser-cut edges to stay invisible under tight workout gear.
Absolutely! They’re designed to be comfortable enough for all-day wear, working out, or not. Feel confident in & out of the gym.
Over 30ml. Equivalent to 6 Tampons.
Designed to help manage light bladder leaks during everyday activity. Individual results may vary.
- Main: 84% Nylon / 16% Elastane
- Inner Gusset: 100% Cotton
- Absorption Lining: 80% Polyester / 20% Cotton
- Leak Proof Lining: 100% Polyester
Wash before wear
Cold gentle machine wash
Do not use fabric conditioner
Do not bleach
Do not iron
Do not dry-clean
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.