No Leaks.
Built-in absorbency holds menstrual flow, while the water-resistant outer helps keep pool water out. Choose a secure fit and change to suit your flow.
Period swimwear for girls and women
What if you NEVER had to miss a pool session or beach day because of your period EVER AGAIN?
Official period-safe swim underwear of Swimming Australia.
UnderSwim is the Official Period-Safe Swim Underwear of Swimming Australia.
Purpose-built period protection, with participation at its heart. So getting your period doesn’t have to mean getting out of the water.
Underswim is compliant for USA Swimming age-group competitions under Rule 205.10.1, which permits a single set of garments beneath a competition swimsuit for modesty and/or privacy.
Wear UNDER Your Own Swimwear
Your swimsuit. Your style. UnderSwim stays hidden underneath, with secure period protection built in.
Choose OG for full-bottom swimwear or G-Fit for higher-cut styles.
No Bulk.
Thin protection and seamless edges keep the extra layer discreet beneath your swimmers.
No Escape Artist Tampon Strings.
An external period option, with no tampon required. Nothing to tuck in before you dive in.
Two fits. One less thing to think about.
UnderSwim OG
$36.95 AUD
For full-bottom swimwear. A seamless underlayer for regular-coverage swimmers, training suits and bikini bottoms.
Absorbs approximately 3–4 regular pads’ or tampons’ worth of menstrual flow.
UnderSwim G-Fit
$36.95 AUD
For high-cut swimwear. A higher-leg silhouette for swimmers and bikini bottoms with less coverage.
Absorbs approximately 1–2 regular pads’ or tampons’ worth of menstrual flow.
What swimmers are saying.
Reviews from UnderSwim OG and G-Fit customers.
The Pool Perfect. Three pairs. Your mix.
SAVE $17.55 AUD
$93.30 AUD for three pairs
$31.10 AUD per pair. $110.85 AUD bought separately.
Build your three-pack with the UnderSwim OG and G-Fit options that suit your swimmers and your week.
Choose the fit, size and colour for each pair from the available options. One to wear, others ready for your next swim.
Thin layers. Serious swim work.
Explore how UnderSwim manages flow. Layer thicknesses are illustrative.
Top layer: against your skin
Choose a layer below to see how it works.
Next to your skin.
The inner surface works with the absorbent protection beneath it to manage menstrual flow.
Absorbs menstrual flow.
The absorbent protection holds menstrual flow. OG holds approximately 3–4 regular pads’ or tampons’ worth; G-Fit holds approximately 1–2.
Helps contain flow.
The protective barrier helps keep absorbed menstrual flow contained.
Water-resistant. Swim-ready.
The outer fabric has a water-resistant coating to help prevent waterlogging and drag, and keep excess water from compromising the seal around your legs. Chlorine-resistant fabric is made for swimming.
How UnderSwim holds flow in
How do they hold flow in but keep water out? See the layers at work.
Absorbency, without the guessing game.
OG: approximately 3–4 regular pads’ or tampons’ worth of menstrual flow. G-Fit: approximately 1–2. These describe capacity, not a fixed number of hours or swims.
Your flow and use determine when to change. Start in a clean pair and change if it feels full or uncomfortable. UnderSwim can be your external period option, or an extra layer alongside your usual tampon or menstrual cup.
Find your UnderSwim fit
Use the size chart for the product you’re buying and check your measurements. Age is a starting point, not a fit test.
Before removing the hygiene sticker, try your Eltees on over clean underwear. Slide a pinky finger under the fabric around the widest part of the bum. Almost no resistance means too big; digging in means too small. A bit of resistance, but not a fight, is just right.
USA SWIMMING AGE-GROUP COMPETITION: COVERED.
Underswim is compliant for USA Swimming age-group competitions under Rule 205.10.1, which permits a single set of garments beneath a competition swimsuit for modesty and/or privacy.
This is compliance with the age-group rule, not USA Swimming endorsement. Different competition levels and governing bodies can have different requirements.
Pack for the swim you have planned.
Swim squad
Start with a clean, dry pair and check the fit beneath your training swimmers. Pack a spare for changing when your flow requires it.
Meet days
Choose the cut that sits discreetly under your race suit. Keep your spare and a wet pouch handy between sessions.
Beach days
OG suits fuller-coverage bottoms; G-Fit suits higher cuts. After swimming, rinse and follow the care instructions.
Shop the swim range.
Choose UnderSwim below, or explore swimwear with protection built in.
Save up to $25 AUD
Period swimwear wear & care
Keep your period swimwear ready for its next session. Our wear and care guide explains how to rinse, wash and dry your Eltees, with the instructions you need to look after their built-in protection.
Swimming on your period: your questions
Can girls still swim when they have their period?
Yes. Period swimwear offers an external option for swimming during a period. Choose an under-swim layer or swimwear with protection built in, based on the fit and absorbency you need.
What’s the difference between absorbent swim liners and period pads?
Period swimwear combines absorbent protection with construction made for the water. Disposable pads absorb pool water, and their adhesive can lose its grip when wet. They aren’t designed for swimming.
Do I need a tampon as well?
Period swimwear can be an external option, or an extra layer of protection alongside your usual tampon or menstrual cup. Check the absorbency and wearing guidance for your chosen product and flow.
Do I wear UnderSwim on its own?
No. UnderSwim OG and G-Fit are worn beneath swimwear. Period swim bikini bottoms and SwimSync are swimwear in their own right, with period protection built in.