UnderSwim G-Fit: Period Swim Underwear (Thong)

UnderSwim G-Fit

(CHEEKY BOTTOM COVERAGE)

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$43.99

Sale Sold out

Taxes included. Shipping calculated at checkout.

Australian Registered Design No. 202417638

G-Fit
OG

Quantity

NEW UnderSwim G-Fit. Handle your flow under cheeky swimwear. The high cut keeps VPL on the down low while still covering the "essentials". Moderate absorbency.

Free delivery $99+ ($129+ NZ)
Hassle-free return & exchange
Designed on the Central Coast NSW, Australia

Check out full details

Your Swim, Your Rules

UnderSwim G-Fit gives women and girls the freedom to wear any swimwear they love, every day of the month.

Whether you're at the pool, a swim meet or training, the beach, or lounging by the water, UnderSwim G-Fit provides discreet, leak-proof protection that fits under pretty much any swim style.

Water-resistant, invisible, and comfortable—choose your swimwear without limits.

Moderate protection (2 tampons/ 2-3 reg pads), water-resistant, and super discreet.

Why is UnderSwim G-Fit the go-to period protection for women and girls when they're rocking a cheeky swim fit in the water?

WATER RESISTANT COATING

Outer coating keeps water out, while the tech layers of inner lining lock her flow in.

INVISIBLE UNDER CHEEKY 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 2-3 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 CHEEKY 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 2-3 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.

The Hype Vs. The Reality

It's a match!

Hides Under ALL SORTS of Swimwear

One-Piece
Hipster Bikini Bottoms
Swimming Race Suits

Why you’ll love UnderSwim G-Fit

Protection that’s as clever as it is discreet

Worry-free swim days are here.

With four layers of absorbent lining, G-Fit handles up to 2 tampons’ worth of flow (15ml)—because there’s no room for leaks when you’re busy living your best life.

Water-resistant magic

A clever water-resistant coating keeps the fabric from getting waterlogged, so you stay comfortable and secure, no matter how long the swim session.

Seamless, barely-there design

Say goodbye to panty lines. G-Fit’s seamless cut stays totally hidden under your cheekiest bikinis while covering all the "essentials".

For every body

Available from G10-12(W4) to W18, these undies are made with tweens, teens, and adult women in mind—perfect for sporty girls, summer-loving teens, or active mums.

"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.

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.

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These Might Come In Handy Too!

High-Cut Active Period Underwear

$43.99

Sale Sold out

Taxes included. Shipping calculated at checkout.

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!

Check out full details

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.