Boyfriend Briefs 2.0
✔ Designed for your heaviest flow days
✔ Full front-to-back protection
✔ The pair you'll reach for every period
Lou & Lauren are wearing sizes Medium and XL.
This style runs a little small - recommend sizing up.
We want you to be as comfortable as possible on your period. Just follow the measurements above.
We recommend measuring yourself, and not going by your standard size. Each style and pair will vary, so please check this if ordering multiple styles.
If you're in-between sizes we recommend sizing up.
Waist: Measure the narrowest part of your waist, below the ribcage and above your hip bone.
Hip: Measure the fullest part of your hip, making sure the tape measure is straight.
Flow: Heavy
Absorbency: 50mls
Tampons Equivalent: Up to 8-10 tampons*
Perfect For: Heavy days
Feels: Secure and comfy
*(Based on 5ml tampon)
Our NEW AuntFlo™ Boyfriend Brief 2.0 Undies are your go-to for embracing comfort and confidence on your heavy days! They hold up 8-10 leak proof tampons and provide leak-proof support without feeling super bulky.
They also have an extended gusset which ensures protection from front to back.
Our period undies are also PFA free. PFAs are absolutely not part of our AuntFlo product design.
Care: Pre-rinse, gentle cold machine wash, hang to dry, reuse and repeat. Read our FAQs for more.
OEKO TEX
This product is OEKO-TEX® STANDARD 100 certified and has been tested for harmful substances.
Certificate: 26.HCN.42389
Testing Institute: Hohenstein/HTI
Made From:
Body: 95% cotton, 5% spandex
Lining: 95% cotton, 5% spandex
Middle: 80% polyester, 20% nylon
As per our 30 Day Risk-Free Trial, first time customers can try one garment from your first order risk-free.
You can read more about this here.
These returns rights are in addition to your usual Statutory Rights summarised in this policy. Please read this returns policy carefully as it contains important terms relating to your purchase.
Mix and match colours and sizes of the same style period underwear.
Here's how to claim your free pairs:
🎁 To claim 1 FREE pair: Simply add 3 single pairs to your cart. The offer will be automatically applied to one pair.
🎁 To claim 2 FREE 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.
Don’t just take our word for it... see how women everywhere are wearing AuntFlo.
Holds up to 8-10 tampons
Leak-proof for peace of mind
Perfect for overnight protection
Better for you & the planet
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, we’re 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!
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.
Our period undies are also PFA free. PFAs are absolutely not part of our AuntFlo product design.
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 it’s time to change:
Overall, always listen to your body and make changes when you start feeling uncomfortable, to maintain confidence and hygiene.
As per our 30 Day Risk-Free Trial, first time customers can try one garment from your first order risk-free. If you're not satisfied with how it functions, we'll gladly refund the cost of that single item (excluding shipping costs).
You can read more about this here.
These returns rights are in addition to your usual Statutory Rights summarised in this policy. Please read this returns policy carefully as it contains important terms relating to your purchase.
Country - Australia
Country - New Zealand
Country - UK
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.
Women from all over Australia, UK & New Zealand are living comfortable and confident!
Overall rating: 4.1 / 5 from 610 reviews.
Great packs
These are so comfortable and I don't feel worried about leakage when I'm wearing them.
Amazing I ordered an 3XL I’m a 16/18 they fit perfectly.
I love this style! I orders two types to see which would be best for me and this week ordered more! Thank you FloFam. 🌟
I look forward to wearing these when I have my period, which sounds crazy. Postpartum baby number 2 my period is ridiculously heavy the first few days and it’s a hot mess. Overnight I now get to be comfortable, not worry about leaking and not feel gross when I wake up! I am about to go place my 3rd order of these!
Very comfy.
I’ve never tried period pants before but when I saw the ads I just knew I’d love them. Super comfy and the heavy absorbency is perfect for night time. I never feel dirty wearing them and they’re easy to clean. Just ordered a bundle of another style for during the day. I’d definitely recommend these as a period staple thank you!
Absolutely love my pants. Saw an ad on Instagram and thought I will just give them a go. My first pair did not fit great but the customer service team were amazing and responding so fast and sent me a new size which fit great. So so comfy to sleep in. Will defo be buying again.
Iv successfully been converted from tampons to aunt flo’s period undies. Perfect fit, comfy and I no longer fear any leaks/overflows at work. Fantastic
So comfy I have been wearing them as bedtime shorts even when I’m not on my period
Best period undies on the market and ive tried then all !! Way better then any cheap ones! Ive bought the 5 variety pack and now these 2 boy legs with one free, incredibly comfy and the boy leg ones are my absolute fave with protection from front to back making great overnight ones! Theyre probably the comfiest i own! As someone with endometriosis and adenomyosis that comes with very heavy periods(were great after my endo surgery too not to tight !)
Very comfortable, I am recently postpartum with a lot of changes to my cycle one being a heavier flow. The previous period undies I owned were not coping with this but these have been great and i haven’t bled thru once. My only fault is the elastic rolling in the waistband
Love them! Comfortable, perfect fit, feeling sexy in them, don't smell. I followed the advise of buying 1 size up and it's the right decision. Want to check more from the brand! And love the bag to wash them!
Absolute game changer. 70 waist, 86 hips. XS fits snug, visually it’ll appear to dig into your waist, but it doesn’t feel overly tight. S feels a little looser and won’t dig as much, though there’s not a huge difference aside from the appearance. The material is not stretchy, and it does roll up the thighs, but neither aspects affect comfort. If I wear it for over ~8 hours on a heavy flow day, it does leak to the sides but never through to my pants, and it washes straight out. Feels dry, and SO much more comfortable than pads; when it starts to feel wet, that’s how I know I need to change. I don’t find it particularly bulky, it’s just like a maxi pad, and I’ve never noticed sounds. Easy to wash, and helps you feel so safe sleeping and moving around! The only negative is the chemical-like smell, even after washing. It’s a bit unpleasant mixed with blood, but generally not noticeable until you use the bathroom
Love Everything about it comfortable very absorbent and looks nice to
Honestly life changing, this is my first period in over 10 years that i haven’t leaked out multiple times in a day and had to scrub my sheets to get blood out, i used to have to wear both a pad and tampon and even still would leak out after 45mins. I wore the boyfriend briefs for my whole 7 hour shift the first day of my period (IYKYK) and not once did i feel like i was wearing a wet nappy, the absorbency is next level! I could not recommend these more if you have a heavy flo! they make me not dread getting my period THANKYOU ❤️
Super absorbent, got the Boyfriend briefs, they're very comfy and no major leaks throughout the day and the night. Have just bought some more and I'm sooo excited to give them a try next cycle. Something incredibly satisfying about not having to wear a pad or tampon and free bleed and feel protected
I’ve experienced many period underwear and I tell you what, Aunty Flo is the most comfortable! Super happy you’ve created the Mercedes of period underwear. Many thanks, Penelope xx
Super comfy, absorbent and wash well. 100% reccomend. Will be getting more.
Its amazing fit and this is the first time on my first day I have been this comfy xx
Excellent love these
I am so happy with these. I have stage 4 endo and have heavy periods. These help me sleep confidently through the night. They’re comfortable as well. 🙌🏻
LOVE these briefs but definitely size up! I am between 10-12 usually, so ordered a large. They’ve been super tight on the waistband so I ordered another set in XL for reference and they’re perfect!!
These are amazing!!
As a mother I wanted to find a product for my daughter that wouldn't put her life and health at risk (TSS) but is also hygienic that's when I came across Auntflo. I ordered a few pairs during sale to try myself to see how the product worked. I'll be honest and say I was sceptical .... but WOW was I proved wrong. They were so comfortable, so easy to clean, absolutely no leakage (and that's never happened before) I was honestly so beyond shocked that this product worked exactly how it was advertised. I can truly say that I found a product that has changed periods for the rest of my life. It's been a weight off my shoulders now that I have found a product that my daughter can use in the future when the time is right without me being terrified that she is risking TSS or any other serious illness that can develop from using mass market products. I will never go back, And I already plan on ordering more - thank you so much for making a risk free and sustainable product that all young girls and women can use, a product like this can save so people from serious health issues and even fatality. I'm so excited to see what you have in store for the future.
Brought these for myself and a set for my teenage daughter and they are great!! Fit well, sized from measurements and are soo comfy. No leaks will definitely be buying more in different styles!!
Great! They're a super comfy cotton. The absorbent panel goes from the waist and at the front all the way to the back waistband which as a bonus stops the awkward line other brands give you halfway down your butt so they feel way more discreet
Love the boyfriend briefs they are super comfy however im usually a small and i sized up to a M but i feel like where the waist band sits is a bit tighter than the other styles eg i have the g string style as well in a medium and they are perfect
Very comfortable. Love the boys leg undies
Super comfy! So glad I've found these with the absorbency all the way up both sides
Snug and practical
The team at Aunt Flo truly goes above and beyond — the customer service is absolutely top-notch. I love the concept of reusable period underwear; not only are they incredibly comfortable to wear, but they’re also environmentally friendly, which is a huge bonus. I’ve had such a great experience that I’ll definitely be purchasing more, especially the Boyfriend Briefs and Classics, as they’ve quickly become my favourites. Thank you for your service
Worth their weight in gold! Super comfy with no leaks no matter the day of the cycle.
Perfect for my 13 year old
So i got the boyfriend briefs 2.0 and the overnight ones too. To clarify I am autistic and work a job that means im running around all day, these period undies have been a LIFESAVER. Chafing on my inner thighs? GONE The icky crinkly feeling that used to annoy me? REMOVED. If you want some good period undies to help manage your flow, these are the way to go. Amazing and comfortable undies, lovely shipping, cute little garment bag. Big win ♡♡♡♡
Great fit and very comfortable
Amazing. I did size up based on past reviews and glad I did so there's no VPL or the dreaded muffin top. I'm a size 10 so went with the size L. They're comfy and love the length. They really are BF style. Easy to wash and wear and absorb very well, no leakage with these shorts. Won't go back to pads after getting these. Thank you Aunt Flo.
My flow is heavy and this didn’t make me feel like I was going to leak. Best product I’ve used!
So comfy love these.
This is my first time ever using period underwear and I was abit skeptical at first. I ordered the shorts in a large (I’m a 10/12) for wearing at night / around the house and they are so comfortable. I’m really heavy my first couple days (go through super plus tampons once an hour) and I was able to wear these pants all night with no leaks, and for hours through the day. I never felt wet or like I smelled and I wasn’t covered in dried blood all around that area like I thought I would be from past experience with pads. Plus they’re also so easy to clean, just rinse them out and shove them in the washing machine. -100% recommend
