Double Undies are designed for women who experience bladder leaks during exercise and want to train with confidence.
Unlike traditional underwear, our design combines absorbent underwear technology with performance-focused features — including a patented winged gusset and double-layer absorbency — to support you through workouts, running, lifting, and high-impact movement.
Getting the right size is key, not just for comfort, but for performance.
Use our size chart and focus on: High hip (top of your hip bones). These determine where the gusset sits, how well the leg opening seals, and whether everything stays in place during movement.
Between sizes? Size up. If they’re too tight, they can shift slightly and create gaps, which is one of the biggest causes of leaks during workouts.
They have a double layer of absorbency and a waterproof layer to stop leaks showing.
They’re designed to protect against leaks, not guarantee zero leakage in every situation.
Fit, flow, and activity level all play a role, but when everything lines up, they perform incredibly well.
Individual results may vary.
No, they’re designed to feel smooth, lightweight, and comfortable while still providing support.
They are slightly thicker than regular underwear due to the absorbent layers, but once they’re on, you won’t notice it.
And compared to pads or liners? They’re far more discreet, secure, and comfortable during movement.
Yes and this is one of the biggest surprises for new customers.
While the design may look different, it’s built for comfort during movement. After a couple of minutes, most people don’t feel them at all, even during workouts.
Yes, they’re great for period, sweat, discharge, and light leaks, not just bladder leaks.
Double Undies are built for leaks during exercise, not just periods — and that’s a big difference.
Most period underwear (especially period thongs) are designed for everyday wear, with a single absorbent layer and a narrow gusset. That often isn’t enough coverage for bladder leaks, sweat, or high-impact workouts.
Double Undies are a period underwear alternative designed specifically for movement.
We’ve engineered them with:
- Double-layer absorbency for improved leak protection
- Patented winged gusset to increase coverage during movement
This gives you better support for bladder leaks, sweat, and light period flow, while staying comfortable and discreet under gym clothing.
That’s exactly why Double Undies exist, to keep leaks invisible, so you can train without worrying.
Yes, they’re designed to be worn on their own. No bulky pads needed.
Yes, many women use Double Undies while managing pelvic floor weakness or postpartum recovery.
We always recommend working with a pelvic floor physio for long-term improvement.
Totally fair, everyone has their preferences.
A lot of our customers weren’t thong wearers before trying Double Undies. Because of our design (especially the wider, more supportive band), many people find them surprisingly comfortable.
That said, we know thongs aren’t for everyone.
Good news, we’re expanding our range. A brief is on the way April 2026, so you’ll have another option soon.
No. They’re made with smooth, laser-cut edges for a seam-free fit 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.
- Wash before wear
- Hand or machine wash under 30º
- Hang out to dry - Do not put in the dryer
- Do not iron - the bond doesn't like heat
- Do not use fabric conditioner
With proper care, they’re designed to handle regular wear and washing while maintaining performance.
If you feel they haven’t lasted as long as they should and you’ve cared for them correctly, please get in touch, we’re here to help.
Yes, they’re designed with antibacterial and odour-control technology to help keep you feeling fresh.
Yes, they’re designed with moisture-wicking and antibacterial layers to keep you feeling clean and comfortable.
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.
This is so important because with Double Undies, fit = performance.
If something feels off, it’s usually not the product — it’s the fit during movement.
Quick fit guide
Feeling digging at the hips or waist? → Size up (but read this first)
In our latest production run, the waistband may feel a little firmer at first, which can make them feel tighter when you first try them on.
The good news — this relaxes quickly with wear.
💡 You can gently stretch the waistband with your hands before wearing to release that initial tension.
If you’re unsure, size up to be safe.
We’d rather you get the right fit before wearing/washing.
If they still feel too tight or are digging in, sizing up is the best option.
Because if they’re too tight, they can:
- Shift during movement
- Pull the gusset out of position
- Create small gaps → which can lead to leaks
Noticing looseness or gaping? → Size down
Feel secure and stays in place? → You’re in the right size
Quick fit check
- Does the gusset sit where it needs to?
- Do the leg openings feel secure (not digging, not loose)?
- Do they stay in place when you move, squat, or jump?
Most leaks during workouts come down to fit + movement — not the product.
First, don’t panic. Let’s figure it out
1. Did you wash them first?
They need to be washed before first wear to activate absorbency.
2. Let’s check the fit
Too tight = shifting
Too loose = gaps
Even a small fit issue can affect performance, especially during high-impact workouts.
3. Consider the type of leak
They’re designed for exercise-induced leaks, not a full bladder release.
If something still doesn’t feel right, reach out, we’ll help you troubleshoot.
Most absorbent underwear isn’t designed for movement or urine leaks.
Double Undies are built specifically for leaks, with a patented winged gusset that gives better coverage where it actually matters
You’re not alone,this is more common than people talk about.
The most important step is to seek help from a pelvic floor physio. They can assess what’s going on and help you improve.
Double Undies are there to give you confidence while you’re moving, but they’re not a replacement for proper support.
We’re also working on building a resource hub to help, keep an eye out.
