UnderSwim: Invisible Leak-Locking Swim Undies Demo
How do they hold flow in but keep water out?
Watch this demo video to find out!
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FREE DELIVERY $99+ AUS ($129+ NZ)
Leak-free, stylish, perfect fit teen period swimwear for active young girls and tweens to enjoy the pool or the beach without stress every day of the month!
Got a tween or teen who avoids the water during her period? Put those days behind her.
4.71 / 5.0
(216) 216 total reviews
4.88 / 5.0
(8) 8 total reviews
4.67 / 5.0
(12) 12 total reviews
Did you know that 67% of girls either ditch sessions or quit swimming because of their period? That's a staggering number. By choosing the right swimwear, you’re telling her that her period shouldn’t dictate her activities.
Pads in the pool? They're not the best mix—becoming soggy and moving out of place, which is the last thing anyone wants. Our teen period swimwear collection is the antithesis of this scenario—offering leak-proof confidence with pool-ready, period-proof innovation.

"But how will I go swimming!?" It's one of the most commonly asked questions when a girl gets her period.
She can hit the pool, enjoy the beach with friends, or dive into the ocean waves even while on her menstrual cycle without:
Our collection of teen period swimwear is designed with tween and teen swimmers in mind, ensuring she can master her metres any day of the month.
Got a tween or teen who avoids the water during her period? Put those days behind her.
4.71 / 5.0
(216) 216 total reviews
4.88 / 5.0
(8) 8 total reviews
4.67 / 5.0
(12) 12 total reviews
How do they hold flow in but keep water out?
Watch this demo video to find out!
Our period swim bottoms go with anything and protect from everything. They differ from UnderSwim in that they are worn on their own, not under an outer layer.
Designed to pair with any top she likes - no "I'm wearing period bottoms!" branding, no fuss, just period protection she can count on.
With built-in absorbency (2–3 tampons or 4 pads worth) and a waterproof lining that keeps leaks in and pool water out, she won't give diving in a second thought.

Featuring four layers of super absorbent, paper thin protection, UnderSwim is worn high up on the hips to create a silhouette that hides discreetly under her swim fit.
No leaks. No worries. And nothing keeping her out of the water.
NEW / G-Fit UnderSwim. For handing her flow under high-cut swimwear.

Crafted from OEKO-TEX® Standard 100 certified fabric, our period swimwear tested to ensure she's not exposed to any harsh chemicals.
With layers of super-absorbent, whisper-thin protection right where it's needed, there's no bulky, soggy aftermath to contend with. No need to worry people might be able to tell if you're wearing period swimwear!
Our distraction-free designs deliver an inch-perfect fit, stay put straps and supreme freedom in the water. Whether she's got light, moderate, or heavy flow, we got you covered. Our teen period swimwear products absorb 2-3 tampons worth of blood providing a leak-free and fun day in and out of water. You can also pair them with a tampon or menstrual cup for extra protection from leaks.
Got a tween or teen who avoids the water during her period? Put those days behind her.
4.71 / 5.0
(216) 216 total reviews
4.88 / 5.0
(8) 8 total reviews
4.67 / 5.0
(12) 12 total reviews
Diving into the pool with teen period swimwear is such a game changer compared to using pads. Why? Well, imagine chilling in the pool without the worry of that weird, soggy pad feeling or fear of leaks.
Period swimwear is made with layers of absorbent lining that are made for protection in the cool. The fabrics are super smart - they're absorbent where you need it, and water repellent everywhere else, so you won't feel like you're lugging around a wet towel while you do your best mermaid impression.
Plus, water can also make the sticky backing that keeps your pad in place ineffective. Another reason why it's not good idea to swim on your period with a pad. Enjoy swimming in style with our life-changing period bikini bottoms and one-piece swimsuit options for teens and tweens.
Keeping period undies fresh, fabulous, and functioning at their peak is sooo easy.
Check out our easy-peasy 'how to wash period undies' guide with everything you need to know.
We're well on our way to achieving our goal of becoming Australia's best teen period swimwear brand with the best range of leak-proof option to inspire confidence in all girls.
We design our teenage period swimwear for comfort and to align with the specific needs of her growing and changing body.
Our swimwear collection features a range of products for teens and tweens. Our innovative, comfortable and functional period swimwear options make it possible to girls who were once reticent to swim when they were on their period, rarely give it a second thought.
Not all period swimwear is created equal. Compare Knicked and Eltee Sydney UnderSwim to see how design, absorbency and coverage can change the feel in the water.
Not all period swimwear is created equal. Compare Knicked and Eltee Sydney UnderSwim to see how design, absorbency and coverage can change the feel in the water.
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