Seamless Active Period Undies
Seamless Active Period Undies
Period underwear that looks as good as it feels! With breathable soft organic materials, our undies are cute and leakproof.
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- Free Shipping Over $70
- 30-Day Risk-Free Trial
- Free From PFAs & Chemicals
Introducing AuntFloโข Seamless Active ๐๐ฝโโ๏ธ โ Your Newest Gym Bestie.ย
Description
Description
Our Seamless Active feel like your most seamless pair of undies, but now with a built-in period-proof lining to keep you comfortable and dry all day.
Thisย range has been designed with a unique, tried and trusted 4 layer leak-proof system that uses the natural properties of organic cotton fabric to wick away moisture, absorb menstrual blood and protect against stains and leaks.ย
Plus, our Seamless Active Range has been created with subtlety in mind. These are crafted to be seamless under gym leggings, shorts and sport uniforms.ย
Ourย AuntFloโข Seamless Active holds up to 4 leak-proof tampons. Ideal for your medium period days. Comfy. Delicate. Invisible.ย
These are period undies you can wear under anything.ย
Our AuntFlowย โข Seamless Active Undies are your go-to for embracing comfort and confidence on medium days! They hold 4 tampons.
Sizing
Sizing
We recommend measuring yourself, and not going by your standard Aussie size. Each style and pair will vary, so please check this if ordering multiple styles.

Build Your Own Bundle
Build Your Own Bundle
Mix and match sizes ofย any single pair Seamless Active Period Underwear.
Here's how to claim your free pairs:
๐ To claimย 1 FREEย pair: Simply add 3 single pairs to your cart. The offer will be automatically applied to one pair.
๐ To claimย 2 FREEย pairs: Simply add 5 single pairs to your cart. The offer will be automatically applied to two pairs.
*Please note this offer can not be combined with other offers or discounts.
How To Use
How To Use
It's best to switch your period undies every 6-8 hours (keep in mind, this may be more regularly if you have a very heavy flow). This makes them perfect for a day at work, home or even overnight!
Please make sure to regularly wash your undies, and to ensure that you rinse them before machine washing.
For the most hygienic results, we recommend the following washing steps:
1. Pre-rinseย using cold water
2. Washย in temperatures under 30ยฐ3.ย Make sure toย stretchย them out for the comfiest fit.
4. Hang dry
Yep, it's that easy!
Made From
Made From
Made from polyester, nylon & elastane, these babies are THE comfiest period protection.
Good For You & The Planet
Good For You & The Planet
Did you know more than 12 billion pads and 7 billion tampons end up in land fill every year? The average person with a period uses 11,000 pads, tampons and liners in their lifetime. By switching to AuntFlo, you're supporting a period and planet positive future.
Our period undies are also PFA free. PFAs are absolutely not part of our AuntFlo product design.






With Our 4-Layer Technology
Designed by women to be as thin as your favourite pair of undies, but with powerful absorbency you can count on ๐ฉธ

Layer 1: Top Layer
Designed for contact with the vulva, this layer is breathable and helps keep you cool and dry, allowing your skin to breathe freely

Layer 2: Absorbent Layer
Engineered with high-performance, innovative microfibers to enable rapid and efficient fluid absorption

Layer 3: Waterproof Layer
This layer forms a protective shield against leaks, delivering all-day confidence and dependable protection you can trust

Layer 4: Cotton Layer
Made from soft cotton, this layer binds all components together to ensure maximum comfort and high-performance support.
Ladies Love Us...
Common Questions
AuntFlo's Answers:
Do I Wear Them On Their Own?
Depending on your flow, and the absorbency level of the underwear you have chosen, you can wear our period undies on their own, or with some added protection.
Take some time to figure out what works best for you! Every period is a unique one.
Is AuntFlo Free Of PFAS?
Our period undies are also PFA free. PFAs are absolutely not part of our AuntFlo product design.
When Do I Know To Change My Undies?
Knowing when to change your period underwear depends on a few factors, such as your flow, the absorbency of the underwear, and your personal comfort. Here are some general guidelines to help you determine when itโs time to change:
1. Flow Level
- Light Flow:ย If you have a lighter flow, you may be able to wear your period underwear for up to 8 hours without needing to change, depending on the product's absorbency rating.
- Moderate Flow:ย For moderate flow, you should change your period underwear approximately every 6-8 hours, especially if you feel any dampness or discomfort.
- Heavy Flow:ย On heavy flow days, it's best to change your period underwear every 4-6 hours to prevent leaks. You may need to change more frequently depending on the volume of blood absorbed.
2. Signs of Full Absorbency
- Feeling Damp or Wet:ย If you begin to feel moisture or dampness through your period underwear, itโs a sign that it has reached its absorbency capacity, and you should change them.
- Discomfort:ย If the underwear starts feeling uncomfortable or you're aware of the fabric sticking to your skin, it's a good idea to change them to maintain comfort and hygiene.
3. Personal Comfort
- If you start feeling less confident or comfortable, even if the underwear hasn't reached its absorbency limit, it's a good idea to change them. Comfort is key to feeling confident and secure during your period.
4. Activity Level
- If you're very active, especially if you're exercising, swimming, or moving around a lot, you might need to change your period underwear more frequently. The increased movement can cause absorption levels to change, and you may feel more comfortable changing to ensure there are no leaks.
5. End of Day / Overnight Use
- If youโre using your period underwear overnight, you may want to change them after 8-12 hours, depending on your flow. Consider pairing them with a menstrual cup or tampon for additional protection if you experience a very heavy flow.
Overall, always listen to your body and make changes when you start feeling uncomfortable, to maintain confidence and hygiene.
Can These Last Me All Day?
Yes,ย period underwear can last the entire work or school day, but it depends on a few factors, such as your flow, the absorbency of the underwear, and your personal comfort.
For lighter to moderate flow, period underwear can comfortably last the entire work or school day.
For heavy flow, you may need to use a backup product or change at least once during the day.
Can I Send These As Gifts?
Have a certain someone who you think needs AuntFlo's period undies in their life?
Our underwear are the perfect gift! You can ship any AuntFlo items directly to that special someone by entering their address as the shipping address, and your own as the billing address.
Plus, we donโt include any value invoices inside the bag as any receipts are sent directly to your own email address.
Yep... itโs that easy!
Wrong Size?
Uh oh, you've grabbed the wrong size...
Unfortunately, due to AuntFlo products being labelled as Sanitary products, we are not able to switch these over for you. You will need to keep these.
Returned sanitary products cannot be resold, despite claims of them being unused, unworn, and unwashed. This is to maintain and uphold strict hygiene, health, and safety standards to protect our customers and warehouse staff.After all, weโre not only here for the planet, but also for your health!
However, if you are a first time customer with us, we can gift you one pair of underwear (in your correct size) if you have accidentally initially purchased the wrong size. Please email us at hi@auntflo.au to chat more about this!
Shipping Info
When you order today, get FREE delivery on all orders over $70AUD.
Delivery will take between 5-15 days depending on your location.
Once your order has been dispatched, we'll send you an email with a tracking number. If your order hasn't arrived after 15 days please email us immediately and we'll follow up with the courier.
Customer Reviews
Women from all over Australia are living comfortable and confident!