Why you'll love it
For the days cramps take over.
A discreet built-in pocket holds a heat patch gently against her lower tummy, helping ease period cramps without bulky layers. The soft, supportive fit feels comforting rather than tight, so she can rest, study or move through her day.
A high-waist brief silhouette with a built-in heat patch pocket, available as a single pair or in 2-pair and 3-pair packs.
A favourite for her most painful period days - warmth, protection and reassurance in one.
Best for
How the undies work
Fabric & care
Good to know
Sizes for tweens & teens
From size 8 up to 6XL
60-Day money Back
Changed your mind? Unworn items can be returned within 60 days.
WHAT OTHER WOMEN ARE SAYING
Your Fanzy Pantz Period Underwear
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.
How does the heat patch pocket help with period pain?
How does the heat patch pocket help with period pain?
How much flow can this pain relief underwear hold?
How much flow can this pain relief underwear hold?
Are these pain relief period underwear gentle on sensitive or postpartum skin?
Are these pain relief period underwear gentle on sensitive or postpartum skin?
Will these undies help with conditions like endometriosis?
Will these undies help with conditions like endometriosis?
Are these postpartum underwear leakproof?
Are these postpartum underwear leakproof?
60—Day money Back
Changed your mind? Unworn items can be returned within 30 days.
Customers praised this innovative design featuring a pocket for heat patches to relieve cramps. Shoppers called it "a game-changer" and "pure genius," noting exceptional comfort, soft breathable fabric, and effective leak protection. The discrete pocket works for heat patches or wipes while traveling. Customers appreciated comfort during bedtime and daily activities.
Heats up quickly and stays warm! Perfect for on-the-go relief. Super convenient and easy to use. Would definitely repurchase.
I find these extremely helpful when you have those pesky unexpected cramps. It’s great to have them on hand and gives me such relief. I keep them in my car, gym bag and even my work locker as you just never know when you’ll need them ☺️
This heat patch has seriously changed my life. I used to dread my periods because the cramps were so intense, and going to the gym felt impossible. Now, if I wake up with cramps, I just slip on my high seamfree period undies, stick a heat patch on, and pull on my leggings – no one can even tell! I can finally get through my day (and my workout!) inn comfort. This has made such a difference in my routine, and I actually feel ready to tackle the day. Can’t recommend it enough!
Amazing customer service and communication with my order thanks so much
the best!! so comfortable & keeps me covered during that time of the month. would highly recommend!!
absolutely love these! easy to use & stays warm for sooo long!!
Got them for my daughter in law and she loved them
Amazing heat patches! My daughter and use them every month… they fit perfectly in your bag and nobody can notice you put them on them!
Great product. Works really well.
super comfy and love the heat pouch! perfect for those days where the cramps are just a bit too much! Love them nd totally recommend! 👌 They also wash really well.
My daughter and I love these! Highly recommend 👌
Great product. Easy to use and they stay in place. Provide heat for a long period. Thanks Amanda!
Great product. Easy to use and they stay in place. Provide heat for a long period. Thanks Amanda!
Great product. Easy to use and they stay in place. Provide heat for a long period. Thanks Amanda!
These are absolutely life changing. Super easy to put on and heat instantly. Perfect for when you are on a night out or simply at the shops and can stick it on for instant relief! Highly recommend.
These are absolutely life changing. Super easy to put on and heat instantly. Perfect for when you are on a night out or simply at the shops and can stick it on for instant relief! Highly recommend.
These period pain relief undies are an absolute game-changer! The pocket for a heat pack is pure genius—perfect for soothing cramps while staying cozy. They’re so comfy, especially for bedtime, and make that time of the month so much more manageable. Love them!
These are absolutely life changing. Super easy to put on and heat instantly. Perfect for when you are on a night out or simply at the shops and can stick it on for instant relief! Highly recommend.
These period pain relief undies are an absolute game-changer! The pocket for a heat pack is pure genius—perfect for soothing cramps while staying cozy. They’re so comfy, especially for bedtime, and make that time of the month so much more manageable. Love them!
I used these undies when I travelled to Bali. I used the pocket for a couple of different things, 1 for the heat patch when I needed it but the other was for my wipes. So fricking handy. I had 1 hand wipe, 1 intimate wipe in there and felt so fresh the whole time.
The warmth from these patches is just right—not too hot, but enough to feel soothing and relaxing. They’re lightweight and don’t feel bulky under clothes, which is a huge plus. Whether I’m running around doing jobs or binge-watching my favorite shows, these patches make those tricky days feel so much
The warmth from these patches is just right—not too hot, but enough to feel soothing and relaxing. They’re lightweight and don’t feel bulky under clothes, which is a huge plus. Whether I’m running around doing jobs or binge-watching my favorite shows, these patches make those tricky days feel so much
The warmth from these patches is just right—not too hot, but enough to feel soothing and relaxing. They’re lightweight and don’t feel bulky under clothes, which is a huge plus. Whether I’m running around doing jobs or binge-watching my favorite shows, these patches make those tricky days feel so much
These heat patches are a lifesaver for those tougher period days. They’re super easy to use, stick right where you need them, and stay warm for hours. I’ve used them at work, while traveling, and even just lounging at home. They’re discreet, effective, and honestly make everything feel a little more manageable.
These heat patches are a lifesaver for those tougher period days. They’re super easy to use, stick right where you need them, and stay warm for hours. I’ve used them at work, while traveling, and even just lounging at home. They’re discreet, effective, and honestly make everything feel a little more manageable.
These heat patches are a lifesaver for those tougher period days. They’re super easy to use, stick right where you need them, and stay warm for hours. I’ve used them at work, while traveling, and even just lounging at home. They’re discreet, effective, and honestly make everything feel a little more manageable.
These are everything when you’ve got cramps but still want to make that weekend getaway happen. The heat pocket is genius—it’s like carrying a little piece of home comfort on the road. Plus, they look cute enough to rock under anything. Function and style? Yes, please!
The Fanzy Pantz Heat Patches are a lifesaver on my toughest period days. The warmth is soothing and lasts for hours, making cramps so much more bearable. I love how discreet and easy they are to use—whether I’m at work or just relaxing at home. They’ve become a non-negotiable part of my period care routine!
For the past 5 years I have had really bad pains from endo. My friend gave me one of her heat patches last week to try out, wow, it made me feel so much better. I got them with the pocket pants and am now feeling so comfy and free. Previously I didn't want to leave the couch on day one and two but now I can. So happy with these patches. FP, can you do a subscription program with these as I am going to need them all the time. I will probably use about 3 per period so if there was an option to get some every 3 months, I would sign up.
So I never realised this was a thing until my friend told me about them last weekend. I purchased them on Monday and got them on Tuesday, which was perfect timing because I got my periods on Wednesday. The stars aligned!!! I also got the heat patches, thank goodness. I used both of them on Wednesday and am so happy to say, I got through day 1 without much pain or leaks. Normally I am taking loads of panadols and sneaking off to the microwave to heat up the heat bag to put under my top at work. Definitely recommend these pants for anyone who gets period pains!
