UnderSwim OG
(REGULAR Bottom Coverage)
Australian Registered Design No. 202417638
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G-Fit
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OG
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Swimming Australia Official Period-Safe Swim Underwear.
Water blocked, period locked. Period-proof any swimsuit with the original UnderSwim: Invisible Period Swim Underwear. Available in G10-12(W4) to W18 for tweens, teens and adult women. Seamless design stays totally hidden under full bottom swimwear while absorbing the same as 3-4 tampons (15ml) of menstrual flow.
- Free delivery $99+ ($129+ NZ)
- Hassle-free return & exchange
- Designed on the Central Coast NSW, Australia
Why is UnderSwim the go-to period protection for women and girls when they're hitting the water?
WATER RESISTANT COATING
Outer coating keeps water out, while the tech layers of inner lining lock her flow in.
INVISIBLE UNDER SWIMWEAR
With seamless edges and a high leg rise, they stay hidden under any swimwear with regular bottom coverage.
SWIMMING AUS COMPLIANT
Compliant with Swimming Australia's 'Inclusive Swimwear Policy'.
SAME AS 4 PADS
Holds the equivalent of 2-3 tampons/ 4 regular pads with ZERO added bulk.
MADE TO LAST
Chlorine resistant coating stands up to pool treatments (but don't forget to rinse them straight after wear!)
OEKO-TEX® CERTIFIED
No harsh chemicals used.
WATER RESISTANT COATING
Outer coating keeps water out, while the tech layers of inner lining lock her flow in.
INVISIBLE UNDER SWIMWEAR
With seamless edges and a high leg rise, they stay hidden under any swimwear with regular bottom coverage.
SWIMMING AUS COMPLIANT
Compliant with Swimming Australia's 'Inclusive Swimwear Policy'.
SAME AS 4 PADS
Holds the equivalent of 2-3 tampons/ 4 regular pads with ZERO added bulk.
MADE TO LAST
Chlorine resistant coating stands up to pool treatments (but don't forget to rinse them straight after wear!)
OEKO-TEX® CERTIFIED
No harsh chemicals used.
Hides Under ALL SORTS of Swimwear
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One-Piece Training Swimsuit
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Hipster Bikini Bottoms
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Swimming Race Suits
NEW ✨ UnderSwim G-Fit
Seamless cut stays totally hidden under cheekier swimwear while also covering all the "essentials".
The Hype Vs. The Reality
It's a match!
"Hello! I'm Sarah, creator of UnderSwim™. I'm a swim mum with a girl who was rocked by her period and lost her love for squad for a while there.
Seeing her enthusiasm wane and her confidence get knocked inspired my to design a solution that would protect her completely and keep her comfy. What started as a tween and teen innovation has grown into a much loved product that's worn by women and girls in Australia, New Zealand and throughout the world.
I hope you love wearing UnderSwim as much as I loved designing it!"
Sarah Greenaway, Eltee Sydney Founder & CEO
Period Swim Underwear? How does THAT work?
Keeping your swim undies fresh and fabulous is super easy! Here’s a quick guide to keep them looking great and performing their best.
Top Care Tips for Period Swim Underwear
FIRST THING'S FIRST
Wash before use to activate the absorbent tech layers.
AFTER YOUR SWIM
Rinse UnderSwim in lukewarm water until it runs clear.
This step really helps maintain their magic and keeps water resistant coating in tip top shape!
IF RINSING IMMEDIATELY ISN'T POSSIBLE?
Store UnderSwim in a waterproof bag (which is super easy, because they come packaged up in one!) and rinse them when you get the chance. Make sure they don’t dry out, the tech layers don't take kindly to that.
HOW TO WASH
Toss them in the machine on a cold cycle, but leave the fabric softener out of this load - it coats the tech layers and over time, it'll take some oomph out of their super-sucking abilities.
HOW TO DRY
Air dry only—no dryers, please. The high heat breaks down the fibres that make your period swim undies great.
When you take them off the line, ensure they're fully dry before storing them away to avoid any unpleasant damp smells.
WANT TO KNOW MORE?
Visit our 'How to Care' page here.
SOLD OUT 7x ALREADY!
UNDERSWIM PERIOD SWIM UNDERWEAR (OG)
How to Wear
Position the waistband of your swim undies comfortably high on hips, creating a gentle curve under the belly button.
This shape makes UnderSwim sit smoothly and discreetly under swimwear. Don't pull them up too high though, that can be uncomfortable. They only need a little lift to do their job.
UnderSwim G-Fit: Period Swim Underwear (Thong)
These Might Come In Handy Too!
High-Cut Active Period Underwear
Holds same as 3-4 tampons. Stays hidden under leotards, high cut costumes and activewear.
Fitted with our exclusive 'Bumpers' for next level leak protection no matter how - or how much - you move!
HOW TO MEASURE
This is a firm fitting garment, designed to stay in place. Size up if you're in between two size options.
1/2 MEASURE: Lay a pair of similar underwear flat and measure the front.
WAIST: Around belly button (narrowest part of torso).
HIP: Measure the fullest part of your bottom around to the top of your public bone.
NOTE: UnderSwim is a firm fit, designed to stay in place. Size up if you're in between two size options.
How to Wash Period Swim Undies
The care instructions for swim period underwear are just like how you look after our regular period undies. Check out the simple 3-steps needed to keep them in tip-top shape here.
Note though, that since swim undies come into contact with chlorine or salt water, it's crucial to rinse them out right after a swim to protect the waterproof coating and keep our swim underwear working like a charm.