woman wearing blue seamless period underwear

grey blue seamless leakproof period underwear

absorbency tech on seamless period underwear

model wearing pale blue seamless period underwear invisible panty lines

blue period underwear with scalloped edging invisible design

blue seamless undies in period underwear kit

Seamless Period Underwear | Invisible No-Show Leakproof Undies

Seamless Period Underwear | Invisible No-Show Leakproof Undies

$24.00

Taxes included.

Seamless, leak-resistant underwear designed to disappear under clothing while supporting light to moderate days.

Size: Teen 16-18 (Adult 12-14)

Choose how many you need: 1 Pair

Free shipping $70+. View shipping policy
60 day returns. View return policy

Why you'll love it

Smooth, no-show period undies.

Made to sit smoothly under activewear, uniforms and fitted clothes, with a soft flexible fit and built-in leak protection. They feel like her regular underwear while quietly keeping her covered.

An easy everyday option for her lighter days, sport and busy school routines.

Best for

Light to moderate flow day
Gym, sport, and active wear
Tight or fitted clothing
Everyday wear
Teens and adults who want discreet protection

How the undies work

Holds 15–20ml (about 2–3 tampons’ worth)
Seamless, soft fabric sits smoothly against the skin
Absorbent inner layers help manage light to moderate flow
Leak-resistant layer helps protect clothing
Flexible fit moves comfortably with your body

No bulk. No visible lines. Just wear, wash, and repeat.

Fabric & care

Made from OEKO-TEX® certified, PFAS-free fabrics

Fabric

Soft, seamless fabric designed for stretch, comfort, and breathability.

Care

Rinse after wear. Cold machine wash. Line dry.
Avoid tumble drying and fabric softener.
We recommend owning more than one pair so you can rotate while one is washing and drying.

Owning more than one pair makes overnight use and school weeks easier.

Good to know

Light to moderate absorbency
Designed to be worn on its own
Invisible under tight or fitted clothing
Reusable and easy to care for
Suitable for teens and adults

Sizes for tweens & teens

From size 8 up to 6XL

Free shipping over $70*

Straightforward delivery, no surprises at checkout.

60-Day money Back

Changed your mind? Unworn items can be returned within 60 days.

Aussie support, when you need it

Have a question? Our team is here to help.

Loved by hundreds of customers

5.0

Chloe Verified Customer

I wear these to the gym and under leggings. No lines, no bulk, and I feel really secure.

Seamless Period Underwear | Invisible No-Show Leakproof Undies

From $24.00

5.0

Jess Verified Customer

These are my go-to for lighter days. They feel just like normal underwear.

Seamless Period Underwear | Invisible No-Show Leakproof Undies

From $24.00

5.0

Emily Verified Customer

I wear fitted pants for work and these are completely invisible. Super comfortable all day.

Seamless Period Underwear | Invisible No-Show Leakproof Undies

From $24.00

How to Care for

Your Fanzy Pantz Period Underwear

Rinse After Use

Rinse your Fanzy Pantz period underwear in cold water until clear to remove excess blood and prevent stains.

Machine Wash Gently

Machine wash cold with like colors on a gentle cycle using mild detergent.

Do not use bleach or fabric softener, as this can reduce absorbency.

Air Dry Only

Lay flat or hang to air dry. Avoid tumble drying—heat can damage the absorbent layers and elastic.

Store When Fully Dry

Once fully dry, store your period panties in a clean, dry place or in your Fanzy Pantz pouch.

Need Help?

Can’t find what you’re looking for or need personalised advice? Our team is here to help with sizing, absorbency, orders, or anything else you’re unsure about.

What makes seamless period underwear different?

Our seamless undies are designed to disappear under your clothes with zero visible pant lines, giving you sleek, confident style without sacrificing leak protection or comfort.

How much flow can seamless period underwear hold?

Our seamless period underwear hold 2–3 tampons’ worth, perfect for moderate flow days when you want reliable, discreet protection that moves with you.

Can I wear the seamless menstrual period undies for workouts or tight-fitting clothes?

Yes, you can wear the seamless menstrual period undies with tight clothing and during workouts. Their smooth fit means no VPL under your gym leggings or bodycon dresses, so you can move, sweat, and shine with total peace of mind.

Are the seamless period undies reusable and eco-friendly?

Yes, our seamless period undies are reusable and eco-friendly. Made to last, washable, and sustainable, they keep you comfortable while helping the planet. Pop them in one of our laundry bags before putting them in the wash to keep them performing their best.

Is this style good for sensitive skin?

Yes, these invisible leak-proof period undies are made from PFAS-free, OEKO-TEX® certified fabrics that are gentle on your skin, perfect even if you’re prone to irritation.

Free shipping over $70

Straightforward delivery, no surprises at checkout.

60—Day money Back

Changed your mind? Unworn items can be returned within 30 days.

Local support, when you need it

Have a question? Our team is here to help.

Customers praised these seamless period underwear for being "truly seamless" and invisible under tight clothing. Shoppers said they're "super comfy," absorbent, and easy to clean. Many highlighted the discreet fit for gym and pilates wear. One customer noted concerns about design quality, and another mentioned the fit being looser in back.

Thinner, more comfortable and truly seamless! You can't see them under clothes.
Super comfy, totally discreet, and no leaks—absolute must-have for workouts!
The fabric is so soft and feels great against my skin. They wash really well.

5 stars: 10 (83%)
4 stars: 1 (8%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 1 (8%)

A big step up from supermarket options. Thinner, more comfortable and truly seamless!! You can’t see them under clothes. Would definitely recommend.

Super comfy and a great fit! Don’t feel too heavy and easy to clean!

Fantastic products!! My daughter LOVES the kit, & knowing everything she needs is all together in 1 pack.
Definitely recommending this product to every mother of girls I know!!

Love these undies!
They're so comfortable and absorbent. The fabric is so soft and feels great against my skin. They wash really well. Highly recommend for anyone looking for a sustainable and comfy solution for their periods!

Not the best design or quality

Hi there,
Thanks so much for your feedback - we're really sorry to hear the design and quality didn't hit the mark for you. At Fanzy Pantz, we’re all about keeping things fresh, fabulous, and functional, so it’s disappointing to hear this wasn’t your experience.

We’re always working to improve, and your insights are incredibly helpful. If you'd be open to it, we’d love to hear more and make it right. Please feel free to reach out directly so we can turn things around 💌

Thanks again for giving us a try. The Fanzy Pantz Team ✨

Finally seam-free underwear for tight fitted clothing!

Obsessed with these! Can wear under the tightest fitting clothes and still be completely free of undie lines!

Gym perfect undies !!

These seamless period undies are perfect for the gym! Super comfy, totally discreet, and no leaks—absolute must-have for workouts!

Seamfree is great

I like these undies, it's seamfree and comfy. The back part is a little bit looser for me and the front is a bit lower than I would normally like but I still find them extremely comfortable and work well during pilates.

Invisible Protection with Maximum Comfort

The Seamless Period Underwear are fantastic! They fit smoothly under any outfit, with no visible lines, and provide excellent protection throughout the day. I forget I’m even wearing period underwear—they’re that comfortable. Highly recommend for anyone seeking discreet and reliable period wear!

Finally, undies that work under leggings

For so long I dreaded getting my periods and going to pilates. I would constantly skip classes and lose money before I just couldn't deal with the stress of leaks and the lines under leggings. Now I have these period underwear, I haven't missed a session. Thanks Fanzy Pantz. Love you guys.

Seamless

These are a life saver! i’d have 20 if i could, they are perfect if you are on your period and still want to wear something tight as you do not see the outlines! These are perfect when wearing a pair of tights or dress and not having to worry about a pad