U by Kotex | Thinx Overnight Period Undies are equipped with our AntiLeak TechTM to help prevent leakage when you’re lying down. Plus, they have a longer and wider absorption zone at the back for added protection all night long
U by Kotex | Thinx Overnight Period Undies are equipped with our AntiLeak TechTM to help prevent leakage when you’re lying down. Plus, they have a longer and wider absorption zone at the back for added protection all night long
in 3 offers
The lowest price for U by Kotex Overnight Period Underwear Brief Black Size 12 1 Pack right now is $24.00 at Woolworths, compared across 3 retailers.
The all-time low was $15.00 on 19 Aug 2025 — today's price is 60% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 8 June 2026.
U by Kotex Overnight Period Underwear Brief Black Size 12 1 Pack
U by Kotex | Thinx Overnight Period Undies are equipped with our AntiLeak TechTM to help prevent leakage when you’re lying down. Plus, they have a longer and wider absorption zone at the back for added protection all night long
U by Kotex | Thinx Overnight Period Undies are equipped with our AntiLeak TechTM to help prevent leakage when you’re lying down. Plus, they have a longer and wider absorption zone at the back for added protection all night long
Last updated at 08/06/2026 04:51:11
U by Kotex Thinx Reusable Period Undies Full Brief Overnight Size 12 each
30-day returns
U by Kotex Thinx Reusable Period Undies Full Brief Overnight Size 12 each
Free delivery between Tue – Wed
U by Kotex Thinx Full Brief Overnight Leakproof Protection Period Undies, 12, Black
Same-day delivery $11
originally posted on ubykotex.com.au
Bought a pair today - this afternoon.Arrived home (super excited), and put them straight on!I got home around 3:30pm ...Was leaking by 7:00pm.Not just light spotting either! Large patches of blood on my dress and red inner thighs...I'm a mum. 3 kids. Didn't notice until i had a moment, after playing in the yard, and then making dinner, to use the toilet...Rubbish product...Fully aware "UP TO 12 HOURS" doesn't mean it will reliably work forfor that long - "for everyone"BUT 3.5 HOURS?! (at best)AND NO. I have no conditions that make me a particularly more heavy bleeder than the average womanBLATANTLY FALSE ADVERTISINGRUBBISH PRODUCTAnd personally disappointing because I selfishly spent $30 on something i thought may save some money.Beyond ... MoreBought a pair today - this afternoon.Arrived home (super excited), and put them straight on!I got home around 3:30pm ...Was leaking by 7:00pm.Not just light spotting either! Large patches of blood on my dress and red inner thighs...I'm a mum. 3 kids. Didn't notice until i had a moment, after playing in the yard, and then making dinner, to use the toilet...Rubbish product...Fully aware "UP TO 12 HOURS" doesn't mean it will reliably work forfor that long - "for everyone"BUT 3.5 HOURS?! (at best)AND NO. I have no conditions that make me a particularly more heavy bleeder than the average womanBLATANTLY FALSE ADVERTISINGRUBBISH PRODUCTAnd personally disappointing because I selfishly spent $30 on something i thought may save some money.Beyond disappointed.This is a rubbish product that does not do what it claims.DISGRACEFUL
originally posted on ubykotex.com.au
It lasts longer than most other kinds I've tested and tried, and it absorbs quiet well. The seal as well is quite good, however I feel it should be wider in the middle section to ensure there is no leakage from the middle or sides (more absorbant material/ lining) They hold quite well in place. Wearing it is often comfortable and not bothersome or obtrusive. The material is nice and soft as well making them comfy to wear throughout the night.The only disadvantage is that they do not absorb quickly in the event of an unexpected gush. For a few moments, you'll feel like you're standing in a puddle.Until it has soaked into the underwear.
originally posted on ubykotex.com.au
These period undies were snug but comfortable, providing me assurance that they'd be leakproof as I tossed and turned throughout the night.I tried them on my heaviest flow night, though I note my periods are not very heavy in general. When I woke up in the morning I felt dry and clean, and had no leaking, smudging, or any of the usual nonsense I get with pads. These period undies also felt way more absorbent than daytime ones.The best part about these is how comfortable it was to sleep in underwear instead of using other period products - no itchy plastic or awkwardly removing a cup when you're half asleep.I threw these in the regular wash and they came out looking like new - definitely helped by the fact they're black and won't stain easily.I plan to buy ... MoreThese period undies were snug but comfortable, providing me assurance that they'd be leakproof as I tossed and turned throughout the night.I tried them on my heaviest flow night, though I note my periods are not very heavy in general. When I woke up in the morning I felt dry and clean, and had no leaking, smudging, or any of the usual nonsense I get with pads. These period undies also felt way more absorbent than daytime ones.The best part about these is how comfortable it was to sleep in underwear instead of using other period products - no itchy plastic or awkwardly removing a cup when you're half asleep.I threw these in the regular wash and they came out looking like new - definitely helped by the fact they're black and won't stain easily.I plan to buy more of these!
U by Kotex Thinx Reusable Period Undies Full Brief Overnight Size 12 each
30-day returns
U by Kotex Thinx Reusable Period Undies Full Brief Overnight Size 12 each
Free delivery between Tue – Wed
U by Kotex Thinx Full Brief Overnight Leakproof Protection Period Undies, 12, Black
Same-day delivery $11
Bought a pair today - this afternoon.Arrived home (super excited), and put them straight on!I got home around 3:30pm ...Was leaking by 7:00pm.Not just light spotting either! Large patches of blood on my dress and red inner thighs...I'm a mum. 3 kids. Didn't notice until i had a moment, after playing in the yard, and then making dinner, to use the toilet...Rubbish product...Fully aware "UP TO 12 HOURS" doesn't mean it will reliably work forfor that long - "for everyone"BUT 3.5 HOURS?! (at best)AND NO. I have no conditions that make me a particularly more heavy bleeder than the average womanBLATANTLY FALSE ADVERTISINGRUBBISH PRODUCTAnd personally disappointing because I selfishly spent $30 on something i thought may save some money.Beyond ... MoreBought a pair today - this afternoon.Arrived home (super excited), and put them straight on!I got home around 3:30pm ...Was leaking by 7:00pm.Not just light spotting either! Large patches of blood on my dress and red inner thighs...I'm a mum. 3 kids. Didn't notice until i had a moment, after playing in the yard, and then making dinner, to use the toilet...Rubbish product...Fully aware "UP TO 12 HOURS" doesn't mean it will reliably work forfor that long - "for everyone"BUT 3.5 HOURS?! (at best)AND NO. I have no conditions that make me a particularly more heavy bleeder than the average womanBLATANTLY FALSE ADVERTISINGRUBBISH PRODUCTAnd personally disappointing because I selfishly spent $30 on something i thought may save some money.Beyond disappointed.This is a rubbish product that does not do what it claims.DISGRACEFUL
It lasts longer than most other kinds I've tested and tried, and it absorbs quiet well. The seal as well is quite good, however I feel it should be wider in the middle section to ensure there is no leakage from the middle or sides (more absorbant material/ lining) They hold quite well in place. Wearing it is often comfortable and not bothersome or obtrusive. The material is nice and soft as well making them comfy to wear throughout the night.The only disadvantage is that they do not absorb quickly in the event of an unexpected gush. For a few moments, you'll feel like you're standing in a puddle.Until it has soaked into the underwear.
These period undies were snug but comfortable, providing me assurance that they'd be leakproof as I tossed and turned throughout the night.I tried them on my heaviest flow night, though I note my periods are not very heavy in general. When I woke up in the morning I felt dry and clean, and had no leaking, smudging, or any of the usual nonsense I get with pads. These period undies also felt way more absorbent than daytime ones.The best part about these is how comfortable it was to sleep in underwear instead of using other period products - no itchy plastic or awkwardly removing a cup when you're half asleep.I threw these in the regular wash and they came out looking like new - definitely helped by the fact they're black and won't stain easily.I plan to buy ... MoreThese period undies were snug but comfortable, providing me assurance that they'd be leakproof as I tossed and turned throughout the night.I tried them on my heaviest flow night, though I note my periods are not very heavy in general. When I woke up in the morning I felt dry and clean, and had no leaking, smudging, or any of the usual nonsense I get with pads. These period undies also felt way more absorbent than daytime ones.The best part about these is how comfortable it was to sleep in underwear instead of using other period products - no itchy plastic or awkwardly removing a cup when you're half asleep.I threw these in the regular wash and they came out looking like new - definitely helped by the fact they're black and won't stain easily.I plan to buy more of these!
I found that this product was fantastic and easy to use. It is more comfortable than wearing pads, tampons or liners, as they are just undies. They provide ease of mind while sleeping as you can wear and forget. They absorb well and are so easy to clean. I just popped mine into the washing machine and they cleaned up very well. I also like how they are dark in colour like black, which makes you feel comfortable that there will be no visible stains or marks. Another thing I really loved about these is that they are full coverage, which allows you to move normally without feeling like you'll move them out of place. I absolutely love this product!!
My teen used these and was surprised at how much she liked them. They were comfortable, true to size and effective. Laundering takes a bit more than regular underwear - to be expected. I did a quick rinse with cold water before throwing them into the washing machine. I sometimes use fabric softener, so I do have to remember not to use it when the period undies are in the load of washing. These can’t be thrown in the dryer, so I’d recommend washing them in a laundry bag so they’re easy to find if the rest of the load is going in the dryer. My teen tried the full brief and would like to try a boyleg version.
Love this new version!I've trialled U by Kotex's previous period undies and this new version as well and love that it appears that U by Kotex has listened to feedback as these overnight undies have changed so that period blood doesn't leak through the seams, while keeping the undies comfortable! One thing I'll note is that my period doesn't really leave my body while sleeping so my experiences may differ to someone else's.As these are overnight undies I think they work well. However, I did have period blood on the seam since it was so wide, so my concern is that if it is used in the day with repeated toilet visits, that the period blood may begin to run towards the seam/become a bit messy to use.Disclaimer: I only trialled this once.
Didn't feel bigger or smaller than the size I expected. The waist has a thick, comfortable band but wasn't as tight fitting around the bum area. It didn't look or feel bulky even with clothes on. Great option for those who don't like the bulkiness of pads. The padding at the back goes up very high. For a first time user it can take a while to get your thoughts to trust the protection it will give but I think they have better performance and protection than pads or tampons. The packet doesn't say but I would recommend rinsing them before machine washing as they can hold a lot of blood. Performed well over 5 hours. Being black in colour it's hard to tell how much longer you could wear it or how much has been absorbed. Upon removing I could feel the extra heaviness ... MoreDidn't feel bigger or smaller than the size I expected. The waist has a thick, comfortable band but wasn't as tight fitting around the bum area. It didn't look or feel bulky even with clothes on. Great option for those who don't like the bulkiness of pads. The padding at the back goes up very high. For a first time user it can take a while to get your thoughts to trust the protection it will give but I think they have better performance and protection than pads or tampons. The packet doesn't say but I would recommend rinsing them before machine washing as they can hold a lot of blood. Performed well over 5 hours. Being black in colour it's hard to tell how much longer you could wear it or how much has been absorbed. Upon removing I could feel the extra heaviness from what was absorbed. I was hesitant but I'd say give them a go, you might be surprised. I found it great for a heavy period backup when wearing tampons to give you extra peace of mind.
I have tried a few different types of period undies, which have been sold in the typical 2 grocery stores, including the big brand of underwear starting with B.And I absolutely loved these undies and preferred them way more! They are so much more comfortable, thinner and breathable compared to others.They have a thick top band which doesn’t dig in and doesn’t leave marks. The material is so soft and thin. It feels like a normal pair of undies, which is what you want and need. They cleaned easily and haven’t faded yet after 3 washes, where other brands have after the 1st.I would love to see different colours and a larger range of sizing though, as I’d love to recommend these to family members!!I got these in a size 14 and they fix amazing, but I will buy a ... MoreI have tried a few different types of period undies, which have been sold in the typical 2 grocery stores, including the big brand of underwear starting with B.And I absolutely loved these undies and preferred them way more! They are so much more comfortable, thinner and breathable compared to others.They have a thick top band which doesn’t dig in and doesn’t leave marks. The material is so soft and thin. It feels like a normal pair of undies, which is what you want and need. They cleaned easily and haven’t faded yet after 3 washes, where other brands have after the 1st.I would love to see different colours and a larger range of sizing though, as I’d love to recommend these to family members!!I got these in a size 14 and they fix amazing, but I will buy a size 16 when I can as well for those bloat days.
These are definitely the best period undies i’ve tried so far. Other ones i’ve tried have been prone to staining/bleaching, but the gusset in these is a different material which doesn’t seem to stain easily. I haven’t had any issues with bleeding through the underwear, even wearing them for the full 12 hours - but I don’t generally have a super heavy flow compared to some people, so this could definitely be a factor to consider. Overall, this product is supportive, secure, and still comfortable to wear overnight or just going about your daily life. Would definitely recommended. -)
I have tried multiple period underwear on the market, but none have compared to the comfortability of the U By Kotex Overnight Period Undies. They feel extremely lightweight, like regular underwear (if not more comfortable). My periods are moderate-heavy and at no point during my time trialling was there any leakage, something I worry about often when going to bed whilst on my period. I would honestly recommend these (and have) to my friends.Before trialling these I would just wear pads to bed and in the morning would often find I had leaked through. On top of that, the convenience of being able to put them in the wash as opposed to throwing out pads makes my morning that little bit easier. I will definitely be purchasing more!
